Built 2026-10-16 (16 October 2026)

Riddle Weather Records (USC00357169)

Record envelope, standing records and threshold days for Riddle (USC00357169), Oregon, United States, with 128 years of record.

Key Facts for Riddle

  • Riddle (USC00357169) is a weather station in Oregon, United States at 42.95 latitude and -123.36 longitude, 207 m (680 ft) above sea level.
  • The station reports from 1899 to 2026, 128 years of record.
  • 1,464 records set at Riddle still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Riddle set a daily record high minimum temperature of 18.3 C (64.9 F) on 27 August 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Oregon, United States, 42.95 latitude, -123.36 longitude.
  • Elevation: 207 m (680 ft).
  • Period of record: 1899 to 2026, 128 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

9 days at or beyond a record
Daily record high and record low at Riddle, with 2026 drawn through them The band shows the record high and record low for each calendar day at Riddle. The lines show the 2026 daily maximum and minimum. 9 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Riddle. The lines show the 2026 daily maximum and minimum. 9 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Riddle, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.8 C (73.0 F)-16.7 C (1.9 F)15.0 C (59.0 F)-2.8 C (27.0 F)
Feb26.7 C (80.1 F)-13.3 C (8.1 F)22.2 C (72.0 F)-0.6 C (30.9 F)
Mar30.0 C (86.0 F)-6.7 C (19.9 F)30.0 C (86.0 F)-0.6 C (30.9 F)
Apr35.0 C (95.0 F)-5.0 C (23.0 F)28.3 C (82.9 F)-1.1 C (30.0 F)
May41.1 C (106.0 F)-3.3 C (26.1 F)31.1 C (88.0 F)3.3 C (37.9 F)
Jun43.9 C (111.0 F)1.1 C (34.0 F)36.7 C (98.1 F)3.3 C (37.9 F)
Jul42.2 C (108.0 F)1.7 C (35.1 F)39.4 C (102.9 F)8.3 C (46.9 F)
Aug43.3 C (109.9 F)2.2 C (36.0 F)38.3 C (100.9 F)7.2 C (45.0 F)
Sep42.2 C (108.0 F)-4.4 C (24.1 F)35.6 C (96.1 F)5.0 C (41.0 F)
Oct38.9 C (102.0 F)-8.3 C (17.1 F)30.6 C (87.1 F)1.1 C (34.0 F)
Nov27.2 C (81.0 F)-10.6 C (12.9 F)n/an/a
Dec23.3 C (73.9 F)-16.1 C (3.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Riddle by the year they were set 1,464 records at Riddle still stand. 1929 holds the most, with 33. 0102030401899: 11913: 201914: 161915: 101916: 271917: 191918: 181919: 231920: 261921: 161922: 101923: 171924: 291925: 101926: 251927: 91928: 171929: 331930: 101931: 111932: 131933: 71934: 81935: 261936: 191937: 171938: 161939: 271940: 111941: 131942: 101943: 141944: 41945: 61946: 11947: 131948: 51949: 221950: 111951: 91952: 121953: 121954: 41955: 211956: 201957: 141958: 151959: 81960: 81961: 91962: 191963: 91964: 81965: 161966: 91967: 61968: 91969: 81970: 111971: 81972: 221973: 61974: 111975: 121976: 111977: 131978: 191979: 121980: 141981: 61982: 71983: 131984: 31985: 111986: 121987: 161988: 81989: 181990: 131991: 131992: 141993: 61994: 91995: 131996: 161997: 31998: 81999: 102000: 12001: 42002: 102003: 102004: 32005: 62006: 172007: 92008: 132009: 62010: 112011: 62012: 152013: 92014: 172015: 152016: 242017: 202018: 102019: 102020: 132021: 192022: 192023: 132024: 122025: 192026: 91899192419361948196019721984199620082020
1,464 records at Riddle still stand. 1929 holds the most, with 33.
Standing records at Riddle by the year they were set
Year setStanding records
18991
191320
191416
191510
191627
191719
191818
191923
192026
192116
192210
192317
192429
192510
192625
19279
192817
192933
193010
193111
193213
19337
19348
193526
193619
193717
193816
193927
194011
194113
194210
194314
19444
19456
19461
194713
19485
194922
195011
19519
195212
195312
19544
195521
195620
195714
195815
19598
19608
19619
196219
19639
19648
196516
19669
19676
19689
19698
197011
19718
197222
19736
197411
197512
197611
197713
197819
197912
198014
19816
19827
198313
19843
198511
198612
198716
19888
198918
199013
199113
199214
19936
19949
199513
199616
19973
19988
199910
20001
20014
200210
200310
20043
20056
200617
20079
200813
20096
201011
20116
201215
20139
201417
201515
201624
201720
201810
201910
202013
202119
202219
202313
202412
202519
20269

All-Time Record Progression

7 new records
When Riddle set new all-time records 7 all-time records were set at Riddle between 17 September 1945 and 27 June 2021. Each dot is a new record. Record high minimum temperatureRecord low maximum temperatureRecord low minimum temperatureRecord daily precipitationRecord high maximum temperature17 September 1945: Record high minimum temperature 22.2 C (72.0 F)26 January 1957: Record low maximum temperature -3.9 C (25.0 F)21 January 1962: Record low minimum temperature -16.7 C (1.9 F)9 December 1972: Record low maximum temperature -4.4 C (24.1 F)21 December 1990: Record low maximum temperature -6.7 C (19.9 F)20 November 2012: Record daily precipitation 112.5 mm (4.4 in)27 June 2021: Record high maximum temperature 43.9 C (111.0 F)19501960197019801990200020102020
7 all-time records were set at Riddle between 17 September 1945 and 27 June 2021. Each dot is a new record.
When Riddle set new all-time records
DateKindDetail
1945-09-17Record high minimum temperatureRecord high minimum temperature 22.2 C (72.0 F)
1957-01-26Record low maximum temperatureRecord low maximum temperature -3.9 C (25.0 F)
1962-01-21Record low minimum temperatureRecord low minimum temperature -16.7 C (1.9 F)
1972-12-09Record low maximum temperatureRecord low maximum temperature -4.4 C (24.1 F)
1990-12-21Record low maximum temperatureRecord low maximum temperature -6.7 C (19.9 F)
2012-11-20Record daily precipitationRecord daily precipitation 112.5 mm (4.4 in)
2021-06-27Record high maximum temperatureRecord high maximum temperature 43.9 C (111.0 F)

Wettest Day of Each Month

Nov: 112.5 mm (4.4 in)
Record daily precipitation for each month at Riddle The wettest day on record for each calendar month at Riddle. The most was 112.5 mm (4.4 in) on 20 November 2012. 050100150 Jan: 72.4 mm (2.9 in), 15 January 1974 Jan Feb: 82.8 mm (3.3 in), 18 February 1983 Feb Mar: 94.7 mm (3.7 in), 16 March 2025 Mar Apr: 33.0 mm (1.3 in), 18 April 2000 Apr May: 49.3 mm (1.9 in), 6 May 1963 May Jun: 37.6 mm (1.5 in), 28 June 1992 Jun Jul: 33.0 mm (1.3 in), 26 July 1947 Jul Aug: 34.5 mm (1.4 in), 23 August 1983 Aug Sep: 47.0 mm (1.9 in), 26 September 1986 Sep Oct: 98.0 mm (3.9 in), 29 October 1950 Oct Nov: 112.5 mm (4.4 in), 20 November 2012 Nov Dec: 101.6 mm (4.0 in), 11 December 1919 Dec
The wettest day on record for each calendar month at Riddle. The most was 112.5 mm (4.4 in) on 20 November 2012.
Record daily precipitation for each month at Riddle
MonthRecord daily precipitation (mm)Date
Jan72.4 mm (2.9 in)15 January 1974
Feb82.8 mm (3.3 in)18 February 1983
Mar94.7 mm (3.7 in)16 March 2025
Apr33.0 mm (1.3 in)18 April 2000
May49.3 mm (1.9 in)6 May 1963
Jun37.6 mm (1.5 in)28 June 1992
Jul33.0 mm (1.3 in)26 July 1947
Aug34.5 mm (1.4 in)23 August 1983
Sep47.0 mm (1.9 in)26 September 1986
Oct98.0 mm (3.9 in)29 October 1950
Nov112.5 mm (4.4 in)20 November 2012
Dec101.6 mm (4.0 in)11 December 1919

Period of Record Coverage

1899 to 2026
Days with data per year at Riddle 115 years of record at Riddle, 1899 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1899, 1927, 1931, 1937, 1942, 1944, 1945, 1946 and others. 1899: 60 of 365 days1913: 329 of 365 days1914: 363 of 365 days1915: 365 of 365 days1916: 365 of 366 days1917: 363 of 365 days1918: 360 of 365 days1919: 363 of 365 days1920: 365 of 366 days1921: 361 of 365 days1922: 365 of 365 days1923: 363 of 365 days1924: 342 of 366 days1925: 357 of 365 days1926: 362 of 365 days1927: 291 of 365 days1928: 363 of 366 days1929: 338 of 365 days1930: 356 of 365 days1931: 328 of 365 days1932: 362 of 366 days1933: 362 of 365 days1934: 365 of 365 days1935: 361 of 365 days1936: 334 of 366 days1937: 284 of 365 days1938: 365 of 365 days1939: 363 of 365 days1940: 365 of 366 days1941: 358 of 365 days1942: 328 of 365 days1943: 364 of 365 days1944: 202 of 366 days1945: 164 of 365 days1946: 152 of 365 days1947: 365 of 365 days1948: 361 of 366 days1949: 361 of 365 days1950: 364 of 365 days1951: 361 of 365 days1952: 363 of 366 days1953: 363 of 365 days1954: 356 of 365 days1955: 360 of 365 days1956: 361 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 365 of 366 days1961: 363 of 365 days1962: 333 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 364 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 365 of 366 days1973: 364 of 365 days1974: 365 of 365 days1975: 363 of 365 days1976: 364 of 366 days1977: 364 of 365 days1978: 365 of 365 days1979: 327 of 365 days1980: 363 of 366 days1981: 335 of 365 days1982: 357 of 365 days1983: 344 of 365 days1984: 356 of 366 days1985: 361 of 365 days1986: 362 of 365 days1987: 364 of 365 days1988: 364 of 366 days1989: 363 of 365 days1990: 361 of 365 days1991: 361 of 365 days1992: 364 of 366 days1993: 365 of 365 days1994: 364 of 365 days1995: 365 of 365 days1996: 365 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 364 of 365 days2002: 363 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 364 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 364 of 365 days2015: 364 of 365 days2016: 365 of 366 days2017: 364 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 364 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 363 of 366 days2025: 355 of 365 days2026: 280 of 365 days19201935195019651980199520102025
115 years of record at Riddle, 1899 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1899, 1927, 1931, 1937, 1942, 1944, 1945, 1946 and others.
Days with data per year at Riddle
YearDays with dataShare of yearComplete
18996016%No
191332990%Yes
191436399%Yes
1915365100%Yes
1916365100%Yes
191736399%Yes
191836099%Yes
191936399%Yes
1920365100%Yes
192136199%Yes
1922365100%Yes
192336399%Yes
192434293%Yes
192535798%Yes
192636299%Yes
192729180%No
192836399%Yes
192933893%Yes
193035698%Yes
193132890%No
193236299%Yes
193336299%Yes
1934365100%Yes
193536199%Yes
193633491%Yes
193728478%No
1938365100%Yes
193936399%Yes
1940365100%Yes
194135898%Yes
194232890%No
1943364100%Yes
194420255%No
194516445%No
194615242%No
1947365100%Yes
194836199%Yes
194936199%Yes
1950364100%Yes
195136199%Yes
195236399%Yes
195336399%Yes
195435698%Yes
195536099%Yes
195636199%Yes
1957365100%Yes
1958365100%Yes
1959365100%Yes
1960365100%Yes
196136399%Yes
196233391%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
1966364100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972365100%Yes
1973364100%Yes
1974365100%Yes
197536399%Yes
197636499%Yes
1977364100%Yes
1978365100%Yes
197932790%No
198036399%Yes
198133592%Yes
198235798%Yes
198334494%Yes
198435697%Yes
198536199%Yes
198636299%Yes
1987364100%Yes
198836499%Yes
198936399%Yes
199036199%Yes
199136199%Yes
199236499%Yes
1993365100%Yes
1994364100%Yes
1995365100%Yes
1996365100%Yes
1997365100%Yes
1998365100%Yes
1999365100%Yes
2000366100%Yes
2001364100%Yes
200236399%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
2010364100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014364100%Yes
2015364100%Yes
2016365100%Yes
2017364100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021364100%Yes
2022365100%Yes
2023365100%Yes
202436399%Yes
202535597%Yes
202628077%No

Latest Records

20
Latest records at Riddle
DateStationRecordValueBeat old record byOld record stoodSignificance
27 August 2026Riddle, USdaily high min (Provisional)18.3 C (64.9 F)0.5 C (0.9 F)4 years12 of 100 (Routine)
17 June 2026Riddle, USdaily high min (Tie)15.6 C (60.1 F)tie68 years7 of 100 (Routine)
22 April 2026Riddle, USdaily rain14.2 mm (0.6 in)0.7 mm (0.03 in)28 years19 of 100 (Routine)
6 April 2026Riddle, USdaily high max28.3 C (82.9 F)0.5 C (0.9 F)19 years15 of 100 (Routine)
25 March 2026Riddle, USdaily high min10.0 C (50.0 F)1.1 C (2.0 F)52 years28 of 100 (Routine)
24 March 2026Riddle, USdaily high min8.9 C (48.0 F)0.6 C (1.1 F)4 years12 of 100 (Routine)
20 March 2026Riddle, USmonthly high max (Tie)30.0 C (86.0 F)tie102 years12 of 100 (Routine)
19 March 2026Riddle, USdaily high max28.9 C (84.0 F)1.1 C (2.0 F)1 year12 of 100 (Routine)
18 March 2026Riddle, USdaily high max28.3 C (82.9 F)0.5 C (0.9 F)97 years40 of 100 (Notable)
17 March 2026Riddle, USdaily high max28.3 C (82.9 F)1.6 C (2.9 F)79 years36 of 100 (Notable)
16 March 2026Riddle, USdaily high max28.3 C (82.9 F)2.2 C (4.0 F)79 years37 of 100 (Notable)
7 February 2026Riddle, USdaily high max (Tie)20.0 C (68.0 F)tie30 years4 of 100 (Routine)
6 February 2026Riddle, USdaily high max (Tie)20.0 C (68.0 F)tie92 years9 of 100 (Routine)
5 February 2026Riddle, USdaily high max22.2 C (72.0 F)1.6 C (2.9 F)63 years32 of 100 (Routine)
27 November 2025Riddle, USdaily high max19.4 C (66.9 F)1.1 C (2.0 F)76 years34 of 100 (Routine)
16 November 2025Riddle, USdaily high max (Tie)22.2 C (72.0 F)tie26 years4 of 100 (Routine)
15 November 2025Riddle, USdaily high max22.2 C (72.0 F)1.6 C (2.9 F)4 years15 of 100 (Routine)
17 September 2025Riddle, USdaily high max37.8 C (100.0 F)0.6 C (1.1 F)63 years29 of 100 (Routine)
16 September 2025Riddle, USdaily high max (Tie)37.2 C (99.0 F)tie44 years5 of 100 (Routine)
11 September 2025Riddle, USdaily high min16.7 C (62.1 F)2.3 C (4.1 F)82 years40 of 100 (Notable)

Climate Trend

99 complete years, 1914 to 2025
Annual mean temperature at Riddle as warming stripes, 1914 to 2025 One stripe for each of 99 complete years at Riddle, 1914 to 2025. Blue stripes are years cooler than the station's own mean of 12.6 C (54.6 F); red stripes are warmer. The coolest year was 1916, at 11.2 C (52.2 F), and the warmest was 2014, at 15.0 C (59.0 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1914: 12.3 C, -0.3 C from the station mean1915: 12.1 C, -0.5 C from the station mean1916: 11.2 C, -1.4 C from the station mean1917: 11.7 C, -0.9 C from the station mean1918: 12.2 C, -0.4 C from the station mean1919: 11.6 C, -1.0 C from the station mean1920: 11.7 C, -0.9 C from the station mean1921: 12.3 C, -0.3 C from the station mean1922: 11.7 C, -0.9 C from the station mean1923: 12.4 C, -0.2 C from the station mean1925: 12.5 C, 0.0 C from the station mean1926: 13.2 C, +0.6 C from the station mean1928: 12.4 C, -0.1 C from the station mean1930: 11.8 C, -0.8 C from the station mean1932: 11.9 C, -0.7 C from the station mean1933: 11.5 C, -1.1 C from the station mean1934: 13.4 C, +0.8 C from the station mean1935: 11.7 C, -0.8 C from the station mean1938: 12.5 C, -0.1 C from the station mean1939: 12.9 C, +0.3 C from the station mean1940: 13.4 C, +0.8 C from the station mean1941: 12.7 C, +0.1 C from the station mean1943: 11.8 C, -0.8 C from the station mean1947: 12.8 C, +0.2 C from the station mean1948: 11.5 C, -1.1 C from the station mean1949: 12.2 C, -0.4 C from the station mean1950: 12.5 C, -0.1 C from the station mean1951: 12.5 C, -0.1 C from the station mean1952: 12.0 C, -0.6 C from the station mean1953: 11.9 C, -0.7 C from the station mean1954: 11.8 C, -0.8 C from the station mean1955: 11.3 C, -1.3 C from the station mean1956: 11.7 C, -0.9 C from the station mean1957: 11.8 C, -0.8 C from the station mean1958: 13.5 C, +0.9 C from the station mean1959: 12.2 C, -0.4 C from the station mean1960: 12.4 C, -0.2 C from the station mean1961: 12.5 C, -0.1 C from the station mean1963: 12.0 C, -0.6 C from the station mean1964: 11.4 C, -1.2 C from the station mean1965: 12.2 C, -0.4 C from the station mean1966: 12.4 C, -0.2 C from the station mean1967: 12.7 C, +0.1 C from the station mean1968: 12.6 C, 0.0 C from the station mean1969: 12.1 C, -0.5 C from the station mean1970: 12.4 C, -0.2 C from the station mean1971: 11.5 C, -1.1 C from the station mean1972: 12.1 C, -0.4 C from the station mean1973: 12.5 C, -0.1 C from the station mean1974: 12.3 C, -0.3 C from the station mean1975: 11.9 C, -0.7 C from the station mean1976: 11.9 C, -0.7 C from the station mean1977: 12.2 C, -0.4 C from the station mean1978: 12.3 C, -0.3 C from the station mean1980: 12.3 C, -0.3 C from the station mean1982: 11.8 C, -0.8 C from the station mean1983: 12.4 C, -0.2 C from the station mean1984: 12.1 C, -0.5 C from the station mean1985: 11.7 C, -0.9 C from the station mean1986: 13.1 C, +0.5 C from the station mean1987: 12.9 C, +0.3 C from the station mean1988: 12.6 C, 0.0 C from the station mean1989: 12.0 C, -0.6 C from the station mean1990: 12.4 C, -0.2 C from the station mean1991: 12.4 C, -0.2 C from the station mean1992: 13.7 C, +1.1 C from the station mean1993: 11.9 C, -0.7 C from the station mean1994: 12.5 C, 0.0 C from the station mean1995: 13.3 C, +0.7 C from the station mean1996: 13.0 C, +0.5 C from the station mean1997: 12.9 C, +0.4 C from the station mean1998: 12.7 C, +0.1 C from the station mean1999: 12.3 C, -0.3 C from the station mean2000: 12.6 C, 0.0 C from the station mean2001: 12.5 C, -0.1 C from the station mean2002: 12.6 C, 0.0 C from the station mean2003: 13.3 C, +0.7 C from the station mean2004: 13.4 C, +0.8 C from the station mean2005: 12.9 C, +0.3 C from the station mean2006: 12.9 C, +0.3 C from the station mean2007: 12.5 C, -0.1 C from the station mean2008: 12.1 C, -0.5 C from the station mean2009: 12.5 C, -0.1 C from the station mean2010: 13.3 C, +0.7 C from the station mean2011: 12.8 C, +0.2 C from the station mean2012: 13.5 C, +0.9 C from the station mean2013: 13.5 C, +1.0 C from the station mean2014: 15.0 C, +2.4 C from the station mean2015: 14.9 C, +2.3 C from the station mean2016: 14.4 C, +1.8 C from the station mean2017: 13.7 C, +1.2 C from the station mean2018: 13.9 C, +1.3 C from the station mean2019: 13.4 C, +0.8 C from the station mean2020: 13.9 C, +1.3 C from the station mean2021: 14.0 C, +1.5 C from the station mean2022: 13.9 C, +1.3 C from the station mean2023: 13.8 C, +1.2 C from the station mean2024: 14.1 C, +1.5 C from the station mean2025: 14.5 C, +1.9 C from the station mean191419201930194019501960197019801990200020102020
One stripe for each of 99 complete years at Riddle, 1914 to 2025. Blue stripes are years cooler than the station's own mean of 12.6 C (54.6 F); red stripes are warmer. The coolest year was 1916, at 11.2 C (52.2 F), and the warmest was 2014, at 15.0 C (59.0 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Riddle as warming stripes, 1914 to 2025
YearAnnual mean temperatureDifference from the station mean
191412.3 C-0.28 C
191512.1 C-0.47 C
191611.2 C-1.36 C
191711.7 C-0.88 C
191812.2 C-0.43 C
191911.6 C-0.96 C
192011.7 C-0.85 C
192112.3 C-0.25 C
192211.7 C-0.88 C
192312.4 C-0.20 C
192512.5 C-0.04 C
192613.2 C+0.58 C
192812.4 C-0.14 C
193011.8 C-0.83 C
193211.9 C-0.70 C
193311.5 C-1.13 C
193413.4 C+0.84 C
193511.7 C-0.84 C
193812.5 C-0.10 C
193912.9 C+0.29 C
194013.4 C+0.77 C
194112.7 C+0.11 C
194311.8 C-0.81 C
194712.8 C+0.25 C
194811.5 C-1.10 C
194912.2 C-0.39 C
195012.5 C-0.09 C
195112.5 C-0.13 C
195212.0 C-0.57 C
195311.9 C-0.71 C
195411.8 C-0.78 C
195511.3 C-1.33 C
195611.7 C-0.86 C
195711.8 C-0.75 C
195813.5 C+0.94 C
195912.2 C-0.36 C
196012.4 C-0.21 C
196112.5 C-0.05 C
196312.0 C-0.56 C
196411.4 C-1.15 C
196512.2 C-0.35 C
196612.4 C-0.15 C
196712.7 C+0.09 C
196812.6 C+0.05 C
196912.1 C-0.53 C
197012.4 C-0.16 C
197111.5 C-1.13 C
197212.1 C-0.44 C
197312.5 C-0.12 C
197412.3 C-0.31 C
197511.9 C-0.71 C
197611.9 C-0.70 C
197712.2 C-0.40 C
197812.3 C-0.30 C
198012.3 C-0.33 C
198211.8 C-0.81 C
198312.4 C-0.18 C
198412.1 C-0.48 C
198511.7 C-0.92 C
198613.1 C+0.53 C
198712.9 C+0.31 C
198812.6 C+0.05 C
198912.0 C-0.62 C
199012.4 C-0.17 C
199112.4 C-0.18 C
199213.7 C+1.10 C
199311.9 C-0.67 C
199412.5 C-0.04 C
199513.3 C+0.69 C
199613.0 C+0.46 C
199712.9 C+0.36 C
199812.7 C+0.10 C
199912.3 C-0.27 C
200012.6 C+0.01 C
200112.5 C-0.10 C
200212.6 C-0.03 C
200313.3 C+0.75 C
200413.4 C+0.78 C
200512.9 C+0.35 C
200612.9 C+0.34 C
200712.5 C-0.08 C
200812.1 C-0.52 C
200912.5 C-0.11 C
201013.3 C+0.71 C
201112.8 C+0.23 C
201213.5 C+0.90 C
201313.5 C+0.96 C
201415.0 C+2.40 C
201514.9 C+2.33 C
201614.4 C+1.85 C
201713.7 C+1.16 C
201813.9 C+1.27 C
201913.4 C+0.84 C
202013.9 C+1.34 C
202114.0 C+1.46 C
202213.9 C+1.34 C
202313.8 C+1.21 C
202414.1 C+1.54 C
202514.5 C+1.92 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1914 to 2025. In Fahrenheit: 0.3 F (0.2 to 0.3) per decade. The slope is a straight line fitted to 99 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Riddle
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (0.1 to 0.2) per decade0.3 F (0.2 to 0.3) per decade1914 to 202599Rise
Mean daily maximum0.1 C (0.1 to 0.2) per decade0.2 F (0.1 to 0.3) per decade1914 to 202599Rise
Mean daily minimum0.2 C (0.1 to 0.2) per decade0.3 F (0.3 to 0.4) per decade1914 to 202599Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1899 to 2026
Yearly extremes at Riddle: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)43.9 C (111.0 F)202138.9 C (102.0 F)115
Coldest night (TNn)-16.7 C (1.9 F)1962-6.7 C (19.9 F)115
Wettest day (Rx1day)112.5 mm (4.4 in)201247.5 mm (1.9 in)119
Wettest five days (Rx5day)220.1 mm (8.7 in)195096.1 mm (3.8 in)119
Longest dry spell (CDD)107 days195155 days119

Hottest day (TXx)

Hottest day (TXx) at Riddle by year The hottest day of the year at Riddle, 1899 to 2026. The record is 43.9 C (111.0 F) in 2021, marked on the chart; the median year is 38.9 C (102.0 F). 303540451900192019401960198020002020Record: 43.9 C (111.0 F) in 2021
The hottest day of the year at Riddle, 1899 to 2026. The record is 43.9 C (111.0 F) in 2021, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Riddle by year
YearHottest day (TXx)
189935.0 C (95.0 F)
1900n/a
1901n/a
1902n/a
1903n/a
191337.8 C (100.0 F)
191438.9 C (102.0 F)
191539.4 C (102.9 F)
191638.3 C (100.9 F)
191738.9 C (102.0 F)
191838.9 C (102.0 F)
191941.1 C (106.0 F)
192040.0 C (104.0 F)
192135.0 C (95.0 F)
192240.0 C (104.0 F)
192338.9 C (102.0 F)
192438.3 C (100.9 F)
192541.7 C (107.1 F)
192641.1 C (106.0 F)
192740.0 C (104.0 F)
192841.1 C (106.0 F)
192937.8 C (100.0 F)
193037.8 C (100.0 F)
193140.0 C (104.0 F)
193240.0 C (104.0 F)
193338.9 C (102.0 F)
193441.7 C (107.1 F)
193543.3 C (109.9 F)
193637.2 C (99.0 F)
193740.6 C (105.1 F)
193842.2 C (108.0 F)
193942.2 C (108.0 F)
194040.0 C (104.0 F)
194140.0 C (104.0 F)
194241.7 C (107.1 F)
194339.4 C (102.9 F)
194435.6 C (96.1 F)
194536.7 C (98.1 F)
194634.4 C (93.9 F)
194736.1 C (97.0 F)
194838.9 C (102.0 F)
194940.6 C (105.1 F)
195040.0 C (104.0 F)
195140.0 C (104.0 F)
195240.0 C (104.0 F)
195336.7 C (98.1 F)
195432.2 C (90.0 F)
195537.8 C (100.0 F)
195638.9 C (102.0 F)
195736.1 C (97.0 F)
195839.4 C (102.9 F)
195937.8 C (100.0 F)
196037.2 C (99.0 F)
196139.4 C (102.9 F)
196237.2 C (99.0 F)
196336.1 C (97.0 F)
196435.0 C (95.0 F)
196535.6 C (96.1 F)
196637.8 C (100.0 F)
196740.0 C (104.0 F)
196836.7 C (98.1 F)
196934.4 C (93.9 F)
197038.3 C (100.9 F)
197136.7 C (98.1 F)
197240.6 C (105.1 F)
197336.7 C (98.1 F)
197437.2 C (99.0 F)
197538.3 C (100.9 F)
197635.6 C (96.1 F)
197743.3 C (109.9 F)
197842.2 C (108.0 F)
197939.4 C (102.9 F)
198038.9 C (102.0 F)
198141.1 C (106.0 F)
198236.7 C (98.1 F)
198336.1 C (97.0 F)
198436.1 C (97.0 F)
198537.8 C (100.0 F)
198637.8 C (100.0 F)
198740.6 C (105.1 F)
198842.2 C (108.0 F)
198936.7 C (98.1 F)
199038.9 C (102.0 F)
199139.4 C (102.9 F)
199239.4 C (102.9 F)
199337.2 C (99.0 F)
199438.3 C (100.9 F)
199537.2 C (99.0 F)
199640.6 C (105.1 F)
199736.1 C (97.0 F)
199840.6 C (105.1 F)
199938.3 C (100.9 F)
200036.7 C (98.1 F)
200138.9 C (102.0 F)
200240.6 C (105.1 F)
200341.1 C (106.0 F)
200440.0 C (104.0 F)
200537.2 C (99.0 F)
200640.6 C (105.1 F)
200739.4 C (102.9 F)
200841.1 C (106.0 F)
200942.2 C (108.0 F)
201040.0 C (104.0 F)
201136.7 C (98.1 F)
201240.0 C (104.0 F)
201337.2 C (99.0 F)
201438.9 C (102.0 F)
201541.7 C (107.1 F)
201641.1 C (106.0 F)
201741.7 C (107.1 F)
201837.8 C (100.0 F)
201940.0 C (104.0 F)
202042.8 C (109.0 F)
202143.9 C (111.0 F)
202240.6 C (105.1 F)
202343.3 C (109.9 F)
202442.2 C (108.0 F)
202541.1 C (106.0 F)
202639.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Riddle by year The coldest night of the year at Riddle, 1899 to 2026. The record is -16.7 C (1.9 F) in 1962, marked on the chart; the median year is -6.7 C (19.9 F). -20-100101900192019401960198020002020Record: -16.7 C (1.9 F) in 1962
The coldest night of the year at Riddle, 1899 to 2026. The record is -16.7 C (1.9 F) in 1962, marked on the chart; the median year is -6.7 C (19.9 F).
Coldest night (TNn) at Riddle by year
YearColdest night (TNn)
18995.6 C (42.1 F)
1900n/a
1901n/a
1902n/a
1903n/a
1913-4.4 C (24.1 F)
1914-9.4 C (15.1 F)
1915-7.8 C (18.0 F)
1916-9.4 C (15.1 F)
1917-9.4 C (15.1 F)
1918-7.2 C (19.0 F)
1919-11.7 C (10.9 F)
1920-6.1 C (21.0 F)
1921-4.4 C (24.1 F)
1922-8.3 C (17.1 F)
1923-7.2 C (19.0 F)
1924-12.2 C (10.0 F)
1925-5.0 C (23.0 F)
1926-4.4 C (24.1 F)
1927-5.0 C (23.0 F)
1928-6.7 C (19.9 F)
1929-9.4 C (15.1 F)
1930-11.1 C (12.0 F)
1931-5.6 C (21.9 F)
1932-16.1 C (3.0 F)
1933-6.1 C (21.0 F)
1934-1.7 C (28.9 F)
1935-3.9 C (25.0 F)
1936-5.6 C (21.9 F)
1937-14.4 C (6.1 F)
1938-9.4 C (15.1 F)
1939-6.1 C (21.0 F)
1940-11.7 C (10.9 F)
1941-6.7 C (19.9 F)
1942-7.8 C (18.0 F)
1943-9.4 C (15.1 F)
1944-5.6 C (21.9 F)
1945-5.0 C (23.0 F)
1946-3.9 C (25.0 F)
1947-7.8 C (18.0 F)
1948-7.8 C (18.0 F)
1949-12.2 C (10.0 F)
1950-11.1 C (12.0 F)
1951-10.6 C (12.9 F)
1952-6.7 C (19.9 F)
1953-3.3 C (26.1 F)
1954-5.0 C (23.0 F)
1955-8.9 C (16.0 F)
1956-9.4 C (15.1 F)
1957-10.6 C (12.9 F)
1958-3.3 C (26.1 F)
1959-5.0 C (23.0 F)
1960-7.8 C (18.0 F)
1961-7.2 C (19.0 F)
1962-16.7 C (1.9 F)
1963-12.2 C (10.0 F)
1964-6.1 C (21.0 F)
1965-8.3 C (17.1 F)
1966-4.4 C (24.1 F)
1967-9.4 C (15.1 F)
1968-5.0 C (23.0 F)
1969-6.7 C (19.9 F)
1970-4.4 C (24.1 F)
1971-6.1 C (21.0 F)
1972-16.1 C (3.0 F)
1973-3.9 C (25.0 F)
1974-11.1 C (12.0 F)
1975-3.9 C (25.0 F)
1976-8.9 C (16.0 F)
1977-8.9 C (16.0 F)
1978-10.6 C (12.9 F)
1979-8.9 C (16.0 F)
1980-11.7 C (10.9 F)
1981-1.1 C (30.0 F)
1982-7.8 C (18.0 F)
1983-7.2 C (19.0 F)
1984-4.4 C (24.1 F)
1985-6.1 C (21.0 F)
1986-3.9 C (25.0 F)
1987-6.7 C (19.9 F)
1988-6.7 C (19.9 F)
1989-13.3 C (8.1 F)
1990-15.0 C (5.0 F)
1991-7.2 C (19.0 F)
1992-2.8 C (27.0 F)
1993-5.6 C (21.9 F)
1994-6.1 C (21.0 F)
1995-2.2 C (28.0 F)
1996-2.2 C (28.0 F)
1997-7.8 C (18.0 F)
1998-13.3 C (8.1 F)
1999-2.2 C (28.0 F)
2000-2.2 C (28.0 F)
2001-3.9 C (25.0 F)
2002-9.4 C (15.1 F)
2003-5.6 C (21.9 F)
2004-1.1 C (30.0 F)
2005-2.2 C (28.0 F)
2006-7.8 C (18.0 F)
2007-5.6 C (21.9 F)
2008-5.6 C (21.9 F)
2009-11.7 C (10.9 F)
2010-2.8 C (27.0 F)
2011-4.4 C (24.1 F)
2012-3.9 C (25.0 F)
2013-10.0 C (14.0 F)
2014-3.3 C (26.1 F)
2015-6.1 C (21.0 F)
2016-7.2 C (19.0 F)
2017-4.4 C (24.1 F)
2018-4.4 C (24.1 F)
2019-6.7 C (19.9 F)
2020-5.0 C (23.0 F)
2021-2.8 C (27.0 F)
2022-6.7 C (19.9 F)
2023-8.9 C (16.0 F)
2024-1.7 C (28.9 F)
2025-7.2 C (19.0 F)
2026-2.8 C (27.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Riddle by year The wettest day of the year at Riddle, 1899 to 2026. The record is 112.5 mm (4.4 in) in 2012, marked on the chart; the median year is 47.5 mm (1.9 in). 02550751001251900192019401960198020002020Record: 112.5 mm (4.4 in) in 2012
The wettest day of the year at Riddle, 1899 to 2026. The record is 112.5 mm (4.4 in) in 2012, marked on the chart; the median year is 47.5 mm (1.9 in).
Wettest day (Rx1day) at Riddle by year
YearWettest day (Rx1day)
189931.5 mm (1.2 in)
190027.9 mm (1.1 in)
190157.2 mm (2.3 in)
190242.9 mm (1.7 in)
190357.2 mm (2.3 in)
191325.1 mm (1.0 in)
191435.6 mm (1.4 in)
191547.8 mm (1.9 in)
191632.5 mm (1.3 in)
191768.6 mm (2.7 in)
191827.9 mm (1.1 in)
1919101.6 mm (4.0 in)
192037.8 mm (1.5 in)
192148.8 mm (1.9 in)
192244.2 mm (1.7 in)
192335.3 mm (1.4 in)
192471.9 mm (2.8 in)
192531.2 mm (1.2 in)
192654.6 mm (2.1 in)
192750.8 mm (2.0 in)
192852.6 mm (2.1 in)
192963.2 mm (2.5 in)
193029.2 mm (1.1 in)
193149.5 mm (1.9 in)
193231.8 mm (1.3 in)
193343.2 mm (1.7 in)
193430.5 mm (1.2 in)
193527.2 mm (1.1 in)
193657.2 mm (2.3 in)
193763.5 mm (2.5 in)
193841.1 mm (1.6 in)
1939101.6 mm (4.0 in)
194057.2 mm (2.3 in)
194162.2 mm (2.4 in)
194249.8 mm (2.0 in)
194349.0 mm (1.9 in)
194421.6 mm (0.9 in)
194545.7 mm (1.8 in)
194636.6 mm (1.4 in)
194750.5 mm (2.0 in)
194863.2 mm (2.5 in)
194933.8 mm (1.3 in)
195098.0 mm (3.9 in)
195154.9 mm (2.2 in)
195238.6 mm (1.5 in)
195366.3 mm (2.6 in)
195443.9 mm (1.7 in)
195560.2 mm (2.4 in)
195661.0 mm (2.4 in)
195749.5 mm (1.9 in)
195866.3 mm (2.6 in)
195948.5 mm (1.9 in)
196054.4 mm (2.1 in)
196160.7 mm (2.4 in)
196251.6 mm (2.0 in)
196349.3 mm (1.9 in)
196459.4 mm (2.3 in)
196586.6 mm (3.4 in)
196647.5 mm (1.9 in)
196729.7 mm (1.2 in)
196843.2 mm (1.7 in)
196955.4 mm (2.2 in)
197036.1 mm (1.4 in)
197148.8 mm (1.9 in)
197242.2 mm (1.7 in)
197359.2 mm (2.3 in)
197472.4 mm (2.9 in)
197540.1 mm (1.6 in)
197625.9 mm (1.0 in)
197738.1 mm (1.5 in)
197845.7 mm (1.8 in)
197950.8 mm (2.0 in)
198047.5 mm (1.9 in)
198154.1 mm (2.1 in)
198277.5 mm (3.1 in)
198382.8 mm (3.3 in)
198469.1 mm (2.7 in)
198524.9 mm (1.0 in)
198653.8 mm (2.1 in)
198758.2 mm (2.3 in)
198841.7 mm (1.6 in)
198932.0 mm (1.3 in)
199037.6 mm (1.5 in)
199158.4 mm (2.3 in)
199237.6 mm (1.5 in)
199337.1 mm (1.5 in)
199430.0 mm (1.2 in)
199561.5 mm (2.4 in)
199669.9 mm (2.8 in)
199738.6 mm (1.5 in)
199872.9 mm (2.9 in)
199945.5 mm (1.8 in)
200066.0 mm (2.6 in)
200136.6 mm (1.4 in)
200279.0 mm (3.1 in)
200340.1 mm (1.6 in)
200443.2 mm (1.7 in)
200551.3 mm (2.0 in)
200646.0 mm (1.8 in)
200739.4 mm (1.6 in)
200844.5 mm (1.8 in)
200942.9 mm (1.7 in)
201033.0 mm (1.3 in)
201164.3 mm (2.5 in)
2012112.5 mm (4.4 in)
201319.8 mm (0.8 in)
201436.3 mm (1.4 in)
201572.9 mm (2.9 in)
201646.2 mm (1.8 in)
201749.3 mm (1.9 in)
201826.2 mm (1.0 in)
201938.4 mm (1.5 in)
202036.8 mm (1.4 in)
202139.4 mm (1.6 in)
202239.6 mm (1.6 in)
202330.5 mm (1.2 in)
202448.3 mm (1.9 in)
202594.7 mm (3.7 in)
202631.5 mm (1.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Riddle by year The wettest five days of the year at Riddle, 1899 to 2026. The record is 220.1 mm (8.7 in) in 1950, marked on the chart; the median year is 96.1 mm (3.8 in). 0501001502002501900192019401960198020002020Record: 220.1 mm (8.7 in) in 1950
The wettest five days of the year at Riddle, 1899 to 2026. The record is 220.1 mm (8.7 in) in 1950, marked on the chart; the median year is 96.1 mm (3.8 in).
Wettest five days (Rx5day) at Riddle by year
YearWettest five days (Rx5day)
189979.5 mm (3.1 in)
190069.9 mm (2.8 in)
190196.0 mm (3.8 in)
190291.7 mm (3.6 in)
1903130.9 mm (5.2 in)
191344.6 mm (1.8 in)
191497.1 mm (3.8 in)
191577.2 mm (3.0 in)
191678.7 mm (3.1 in)
1917136.4 mm (5.4 in)
191865.5 mm (2.6 in)
1919132.5 mm (5.2 in)
192084.9 mm (3.3 in)
192185.7 mm (3.4 in)
192281.0 mm (3.2 in)
192366.1 mm (2.6 in)
1924196.2 mm (7.7 in)
192591.6 mm (3.6 in)
192693.0 mm (3.7 in)
1927124.2 mm (4.9 in)
192883.8 mm (3.3 in)
1929143.8 mm (5.7 in)
193058.6 mm (2.3 in)
193188.2 mm (3.5 in)
193279.2 mm (3.1 in)
193382.8 mm (3.3 in)
193488.9 mm (3.5 in)
193551.6 mm (2.0 in)
1936132.8 mm (5.2 in)
193774.2 mm (2.9 in)
193899.8 mm (3.9 in)
1939168.1 mm (6.6 in)
1940112.8 mm (4.4 in)
1941101.1 mm (4.0 in)
194288.9 mm (3.5 in)
1943101.8 mm (4.0 in)
194449.3 mm (1.9 in)
194577.1 mm (3.0 in)
194693.2 mm (3.7 in)
194777.5 mm (3.1 in)
1948118.8 mm (4.7 in)
194959.8 mm (2.4 in)
1950220.1 mm (8.7 in)
1951101.1 mm (4.0 in)
1952110.5 mm (4.4 in)
1953120.7 mm (4.8 in)
1954122.1 mm (4.8 in)
1955140.9 mm (5.5 in)
1956135.9 mm (5.4 in)
1957130.0 mm (5.1 in)
1958103.6 mm (4.1 in)
1959146.3 mm (5.8 in)
1960125.4 mm (4.9 in)
1961165.6 mm (6.5 in)
196261.3 mm (2.4 in)
196393.6 mm (3.7 in)
1964194.5 mm (7.7 in)
1965174.5 mm (6.9 in)
1966145.8 mm (5.7 in)
196789.9 mm (3.5 in)
196868.2 mm (2.7 in)
1969100.9 mm (4.0 in)
1970104.2 mm (4.1 in)
1971119.3 mm (4.7 in)
197291.9 mm (3.6 in)
1973149.1 mm (5.9 in)
1974205.1 mm (8.1 in)
197578.2 mm (3.1 in)
197663.6 mm (2.5 in)
1977124.5 mm (4.9 in)
197859.7 mm (2.4 in)
197972.9 mm (2.9 in)
1980102.4 mm (4.0 in)
1981111.3 mm (4.4 in)
1982111.2 mm (4.4 in)
1983103.3 mm (4.1 in)
1984105.1 mm (4.1 in)
198547.8 mm (1.9 in)
1986112.3 mm (4.4 in)
1987120.9 mm (4.8 in)
198860.6 mm (2.4 in)
198956.6 mm (2.2 in)
199058.2 mm (2.3 in)
199192.7 mm (3.6 in)
199276.3 mm (3.0 in)
199371.1 mm (2.8 in)
199465.3 mm (2.6 in)
1995163.1 mm (6.4 in)
1996183.2 mm (7.2 in)
1997135.4 mm (5.3 in)
1998144.8 mm (5.7 in)
199996.8 mm (3.8 in)
2000131.3 mm (5.2 in)
200177.0 mm (3.0 in)
2002157.0 mm (6.2 in)
2003113.5 mm (4.5 in)
2004104.7 mm (4.1 in)
2005134.6 mm (5.3 in)
2006151.1 mm (5.9 in)
200785.3 mm (3.4 in)
2008100.9 mm (4.0 in)
200960.5 mm (2.4 in)
201065.2 mm (2.6 in)
201179.8 mm (3.1 in)
2012129.6 mm (5.1 in)
201340.3 mm (1.6 in)
201487.2 mm (3.4 in)
2015153.7 mm (6.1 in)
2016126.9 mm (5.0 in)
2017104.6 mm (4.1 in)
201856.5 mm (2.2 in)
201989.4 mm (3.5 in)
202072.4 mm (2.9 in)
202166.3 mm (2.6 in)
202279.0 mm (3.1 in)
202358.8 mm (2.3 in)
202496.1 mm (3.8 in)
2025134.9 mm (5.3 in)
202646.2 mm (1.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Riddle by year The longest dry spell of the year at Riddle, 1899 to 2026. The record is 107 days in 1951, marked on the chart; the median year is 55 days. 02550751001251900192019401960198020002020Record: 107 days in 1951
The longest dry spell of the year at Riddle, 1899 to 2026. The record is 107 days in 1951, marked on the chart; the median year is 55 days.
Longest dry spell (CDD) at Riddle by year
YearLongest dry spell (CDD)
189949 days
190075 days
190142 days
190277 days
190317 days
191331 days
191473 days
191565 days
191630 days
191778 days
191828 days
191976 days
192045 days
192145 days
192250 days
192344 days
192443 days
192575 days
192682 days
192765 days
192872 days
192978 days
193078 days
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Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

99 years with a frost

Across 99 years with a frost, the median last spring frost at Riddle falls on 21 April and the median first autumn frost on 26 October, which leaves a median of 192 days between them.

In 1996 to 2025 the median growing season was 210 days. That is 41 days more than in 1914 to 1953.

Fitted over all years, the growing season changes by +5.0 days per decade at this station.

Frost dates and growing season at Riddle
MeasureMedian, all yearsEarliest period (1914 to 1953)Recent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost21 April30 April13 April17 days earlier-2.6 days per decade
First autumn frost26 October19 October4 November16 days later+2.4 days per decade
Growing days192 days169 days210 days41 days more+5.0 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

107 years, 1900 to 2025

A day with at least 46.9 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 110.2 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Riddle: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years46.9 mm (1.8 in)
5 years62.9 mm (2.5 in)
10 years73.8 mm (2.9 in)
25 years88.1 mm (3.5 in)
50 years99.1 mm (3.9 in)
100 years110.2 mm (4.3 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 107 years of values from 1900 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 112.5 mm (4.4 in) in 2012; 101.6 mm (4.0 in) in 1919; 101.6 mm (4.0 in) in 1939.

Station Changes

3 suspected

3 changes were suspected in the annual mean temperature of Riddle, at 1949, 1987 and 2011. Each is measured against neighbouring stations.

  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1949 ran 0.3 C (0.5 F) higher than in the years before (possible change).
  • Relative to 5 neighbouring stations, the station's annual mean temperature from 1987 ran 0.4 C (0.7 F) lower than in the years before (likely change).
  • Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.5 C (1.0 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Riddle, against neighbouring stations
YearShift (C)Shift (F)StrengthNeighbours
1949+0.3+0.5possible5
1987-0.4-0.7likely5
2011+0.5+1.0possible5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Riddle had a mean temperature of 14.0 C (57.1 F) and 777.6 mm (30.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Montpellier-Aeroport (France, 9,060 km away), Girona/Costa Brava (Spain, 9,151 km away) and Lakeport (United States, 437 km away).

Climate twins of Riddle: stations whose 1961 to 1990 climate is closest to its 2011 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
Montpellier-AeroportFrance9,060 km (5,630 mi)14.2 C (57.5 F)699.1 mm (27.5 in)0.61
Girona/Costa BravaSpain9,151 km (5,686 mi)14.1 C (57.4 F)714.2 mm (28.1 in)0.61
LakeportUnited States437 km (272 mi)14.1 C (57.4 F)777.2 mm (30.6 in)0.71

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

  • Data for Riddle standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Riddle threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).