Built 2026-10-17 (17 October 2026)

San Jon Weather Records (USC00297867)

Record envelope, standing records and threshold days for San Jon (USC00297867), New Mexico, United States, with 115 years of record.

Key Facts for San Jon

  • San Jon (USC00297867) is a weather station in New Mexico, United States at 35.11 latitude and -103.33 longitude, 1,289 m (4,230 ft) above sea level.
  • The station reports from 1907 to 2021, 115 years of record.
  • 1,464 records set at San Jon still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • San Jon set a daily record precipitation of 3.8 mm (0.15 in) on 25 January 2021.

About the Station

  • Location: New Mexico, United States, 35.11 latitude, -103.33 longitude.
  • Elevation: 1,289 m (4,230 ft).
  • Period of record: 1907 to 2021, 115 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at San Jon, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Jon. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Jon. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Jon, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan28.3 C (82.9 F)-28.9 C (-20.0 F)n/an/a
Feb30.0 C (86.0 F)-28.3 C (-18.9 F)n/an/a
Mar32.8 C (91.0 F)-22.8 C (-9.0 F)n/an/a
Apr36.7 C (98.1 F)-13.3 C (8.1 F)n/an/a
May40.0 C (104.0 F)-6.1 C (21.0 F)n/an/a
Jun43.3 C (109.9 F)1.7 C (35.1 F)n/an/a
Jul43.9 C (111.0 F)8.9 C (48.0 F)n/an/a
Aug42.2 C (108.0 F)7.2 C (45.0 F)n/an/a
Sep40.6 C (105.1 F)-1.1 C (30.0 F)n/an/a
Oct36.7 C (98.1 F)-11.7 C (10.9 F)n/an/a
Nov32.8 C (91.0 F)-20.6 C (-5.1 F)n/an/a
Dec26.7 C (80.1 F)-26.1 C (-15.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Jon by the year they were set 1,464 records at San Jon still stand. 2020 holds the most, with 36. 0102030401907: 31908: 141909: 241910: 161911: 341912: 211913: 121915: 131916: 151917: 171918: 211919: 161920: 191921: 101922: 251923: 131924: 181925: 151926: 81927: 171928: 121929: 111930: 151931: 41932: 171933: 131934: 61935: 121936: 111937: 81938: 121939: 141940: 161941: 31942: 81943: 141944: 161945: 131946: 161947: 171948: 231949: 81950: 161951: 171952: 201953: 241954: 81955: 151956: 181957: 151958: 71959: 131960: 91961: 181962: 181963: 221964: 91965: 131966: 151967: 131968: 21969: 101970: 151971: 171972: 131973: 111974: 121975: 81976: 91977: 41978: 81979: 51980: 121981: 121982: 91983: 141984: 71985: 61986: 81987: 101988: 41989: 191990: 201991: 111992: 61993: 51994: 81995: 141996: 151997: 101998: 51999: 42000: 182001: 32002: 42003: 132004: 72005: 122006: 212007: 72008: 82009: 142010: 92011: 192012: 132013: 152014: 112015: 102016: 172017: 182018: 152019: 112020: 361907192019321944195619681980199220042016
1,464 records at San Jon still stand. 2020 holds the most, with 36.
Standing records at San Jon by the year they were set
Year setStanding records
19073
190814
190924
191016
191134
191221
191312
191513
191615
191717
191821
191916
192019
192110
192225
192313
192418
192515
19268
192717
192812
192911
193015
19314
193217
193313
19346
193512
193611
19378
193812
193914
194016
19413
19428
194314
194416
194513
194616
194717
194823
19498
195016
195117
195220
195324
19548
195515
195618
195715
19587
195913
19609
196118
196218
196322
19649
196513
196615
196713
19682
196910
197015
197117
197213
197311
197412
19758
19769
19774
19788
19795
198012
198112
19829
198314
19847
19856
19868
198710
19884
198919
199020
199111
19926
19935
19948
199514
199615
199710
19985
19994
200018
20013
20024
200313
20047
200512
200621
20077
20088
200914
20109
201119
201213
201315
201411
201510
201617
201718
201815
201911
202036

All-Time Record Progression

7 new records
When San Jon set new all-time records 7 all-time records were set at San Jon between 20 July 1940 and 13 July 2016. Each dot is a new record. Record high minimum temperatureRecord high maximum temperatureRecord snow depthRecord low maximum temperature20 July 1940: Record high minimum temperature 27.8 C (82.0 F)24 June 1953: Record high maximum temperature 42.2 C (108.0 F)9 February 1986: Record snow depth 50.8 cm (20.0 in)10 February 1986: Record snow depth 55.9 cm (22.0 in)24 June 1990: Record high maximum temperature 43.3 C (109.9 F)22 December 1990: Record low maximum temperature -12.8 C (9.0 F)13 July 2016: Record high maximum temperature 43.9 C (111.0 F)19401950196019701980199020002010
7 all-time records were set at San Jon between 20 July 1940 and 13 July 2016. Each dot is a new record.
When San Jon set new all-time records
DateKindDetail
1940-07-20Record high minimum temperatureRecord high minimum temperature 27.8 C (82.0 F)
1953-06-24Record high maximum temperatureRecord high maximum temperature 42.2 C (108.0 F)
1986-02-09Record snow depthRecord snow depth 50.8 cm (20.0 in)
1986-02-10Record snow depthRecord snow depth 55.9 cm (22.0 in)
1990-06-24Record high maximum temperatureRecord high maximum temperature 43.3 C (109.9 F)
1990-12-22Record low maximum temperatureRecord low maximum temperature -12.8 C (9.0 F)
2016-07-13Record high maximum temperatureRecord high maximum temperature 43.9 C (111.0 F)

Wettest Day of Each Month

Aug: 100.6 mm (4.0 in)
Record daily precipitation for each month at San Jon The wettest day on record for each calendar month at San Jon. The most was 100.6 mm (4.0 in) on 23 August 1911. 050100150 Jan: 43.9 mm (1.7 in), 28 January 2010 Jan Feb: 41.1 mm (1.6 in), 4 February 1956 Feb Mar: 48.3 mm (1.9 in), 20 March 1985 Mar Apr: 92.5 mm (3.6 in), 9 April 1919 Apr May: 66.5 mm (2.6 in), 22 May 2014 May Jun: 88.9 mm (3.5 in), 4 June 1926 Jun Jul: 88.9 mm (3.5 in), 10 July 1996 Jul Aug: 100.6 mm (4.0 in), 23 August 1911 Aug Sep: 93.5 mm (3.7 in), 2 September 1986 Sep Oct: 90.2 mm (3.6 in), 10 October 1930 Oct Nov: 47.2 mm (1.9 in), 24 November 1940 Nov Dec: 50.8 mm (2.0 in), 20 December 1938 Dec
The wettest day on record for each calendar month at San Jon. The most was 100.6 mm (4.0 in) on 23 August 1911.
Record daily precipitation for each month at San Jon
MonthRecord daily precipitation (mm)Date
Jan43.9 mm (1.7 in)28 January 2010
Feb41.1 mm (1.6 in)4 February 1956
Mar48.3 mm (1.9 in)20 March 1985
Apr92.5 mm (3.6 in)9 April 1919
May66.5 mm (2.6 in)22 May 2014
Jun88.9 mm (3.5 in)4 June 1926
Jul88.9 mm (3.5 in)10 July 1996
Aug100.6 mm (4.0 in)23 August 1911
Sep93.5 mm (3.7 in)2 September 1986
Oct90.2 mm (3.6 in)10 October 1930
Nov47.2 mm (1.9 in)24 November 1940
Dec50.8 mm (2.0 in)20 December 1938

Period of Record Coverage

1907 to 2021
Days with data per year at San Jon 114 years of record at San Jon, 1907 to 2021. 17 years have data for under 90 percent of days and are left out of rankings: 1907, 1919, 1920, 1921, 1922, 1925, 1926, 1928 and others. 1907: 214 of 365 days1908: 362 of 366 days1909: 362 of 365 days1910: 364 of 365 days1911: 361 of 365 days1912: 348 of 366 days1913: 363 of 365 days1915: 357 of 365 days1916: 358 of 366 days1917: 358 of 365 days1918: 332 of 365 days1919: 265 of 365 days1920: 328 of 366 days1921: 325 of 365 days1922: 326 of 365 days1923: 335 of 365 days1924: 335 of 366 days1925: 299 of 365 days1926: 319 of 365 days1927: 337 of 365 days1928: 321 of 366 days1929: 280 of 365 days1930: 320 of 365 days1931: 350 of 365 days1932: 359 of 366 days1933: 362 of 365 days1934: 361 of 365 days1935: 362 of 365 days1936: 337 of 366 days1937: 280 of 365 days1938: 313 of 365 days1939: 337 of 365 days1940: 355 of 366 days1941: 362 of 365 days1942: 360 of 365 days1943: 361 of 365 days1944: 366 of 366 days1945: 363 of 365 days1946: 365 of 365 days1947: 353 of 365 days1948: 364 of 366 days1949: 351 of 365 days1950: 365 of 365 days1951: 363 of 365 days1952: 364 of 366 days1953: 362 of 365 days1954: 348 of 365 days1955: 357 of 365 days1956: 365 of 366 days1957: 361 of 365 days1958: 364 of 365 days1959: 361 of 365 days1960: 359 of 366 days1961: 328 of 365 days1962: 364 of 365 days1963: 362 of 365 days1964: 364 of 366 days1965: 363 of 365 days1966: 363 of 365 days1967: 364 of 365 days1968: 365 of 366 days1969: 365 of 365 days1970: 364 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 334 of 365 days1974: 365 of 365 days1975: 364 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 335 of 365 days1979: 365 of 365 days1980: 364 of 366 days1981: 364 of 365 days1982: 363 of 365 days1983: 362 of 365 days1984: 366 of 366 days1985: 364 of 365 days1986: 361 of 365 days1987: 363 of 365 days1988: 363 of 366 days1989: 363 of 365 days1990: 361 of 365 days1991: 357 of 365 days1992: 362 of 366 days1993: 329 of 365 days1994: 363 of 365 days1995: 360 of 365 days1996: 364 of 366 days1997: 362 of 365 days1998: 361 of 365 days1999: 361 of 365 days2000: 361 of 366 days2001: 357 of 365 days2002: 356 of 365 days2003: 324 of 365 days2004: 357 of 366 days2005: 364 of 365 days2006: 365 of 365 days2007: 354 of 365 days2008: 359 of 366 days2009: 355 of 365 days2010: 351 of 365 days2011: 356 of 365 days2012: 365 of 366 days2013: 363 of 365 days2014: 364 of 365 days2015: 301 of 365 days2016: 302 of 366 days2017: 364 of 365 days2018: 365 of 365 days2019: 341 of 365 days2020: 336 of 366 days2021: 31 of 365 days1920193519501965198019952010
114 years of record at San Jon, 1907 to 2021. 17 years have data for under 90 percent of days and are left out of rankings: 1907, 1919, 1920, 1921, 1922, 1925, 1926, 1928 and others.
Days with data per year at San Jon
YearDays with dataShare of yearComplete
190721459%No
190836299%Yes
190936299%Yes
1910364100%Yes
191136199%Yes
191234895%Yes
191336399%Yes
191535798%Yes
191635898%Yes
191735898%Yes
191833291%Yes
191926573%No
192032890%No
192132589%No
192232689%No
192333592%Yes
192433592%Yes
192529982%No
192631987%No
192733792%Yes
192832188%No
192928077%No
193032088%No
193135096%Yes
193235998%Yes
193336299%Yes
193436199%Yes
193536299%Yes
193633792%Yes
193728077%No
193831386%No
193933792%Yes
194035597%Yes
194136299%Yes
194236099%Yes
194336199%Yes
1944366100%Yes
194536399%Yes
1946365100%Yes
194735397%Yes
194836499%Yes
194935196%Yes
1950365100%Yes
195136399%Yes
195236499%Yes
195336299%Yes
195434895%Yes
195535798%Yes
1956365100%Yes
195736199%Yes
1958364100%Yes
195936199%Yes
196035998%Yes
196132890%No
1962364100%Yes
196336299%Yes
196436499%Yes
196536399%Yes
196636399%Yes
1967364100%Yes
1968365100%Yes
1969365100%Yes
1970364100%Yes
1971365100%Yes
1972366100%Yes
197333492%Yes
1974365100%Yes
1975364100%Yes
1976366100%Yes
1977365100%Yes
197833592%Yes
1979365100%Yes
198036499%Yes
1981364100%Yes
198236399%Yes
198336299%Yes
1984366100%Yes
1985364100%Yes
198636199%Yes
198736399%Yes
198836399%Yes
198936399%Yes
199036199%Yes
199135798%Yes
199236299%Yes
199332990%Yes
199436399%Yes
199536099%Yes
199636499%Yes
199736299%Yes
199836199%Yes
199936199%Yes
200036199%Yes
200135798%Yes
200235698%Yes
200332489%No
200435798%Yes
2005364100%Yes
2006365100%Yes
200735497%Yes
200835998%Yes
200935597%Yes
201035196%Yes
201135698%Yes
2012365100%Yes
201336399%Yes
2014364100%Yes
201530182%No
201630283%No
2017364100%Yes
2018365100%Yes
201934193%Yes
202033692%Yes
2021318%No

Latest Records

20
Latest records at San Jon
DateStationRecordValueBeat old record byOld record stoodSignificance
25 January 2021San Jon, USdaily rain3.8 mm (0.15 in)0.8 mm (0.03 in)59 years20 of 100 (Routine)
27 November 2020San Jon, USdaily snow depth5.1 cm (2.0 in)2.6 cm (1.0 in)15 years19 of 100 (Routine)
18 November 2020San Jon, USdaily high max29.4 C (84.9 F)1.6 C (2.9 F)78 years35 of 100 (Notable)
18 November 2020San Jon, USmonthly high min15.6 C (60.1 F)0.6 C (1.1 F)17 years26 of 100 (Routine)
17 November 2020San Jon, USdaily high max (Tie)27.8 C (82.0 F)tie82 years8 of 100 (Routine)
4 November 2020San Jon, USdaily high max (Tie)29.4 C (84.9 F)tie104 years10 of 100 (Routine)
29 October 2020San Jon, USdaily rain12.4 mm (0.5 in)1.2 mm (0.05 in)109 years20 of 100 (Routine)
28 October 2020San Jon, USdaily snowfall19.1 cm (7.5 in)19.1 cm (7.5 in)112 years78 of 100 (Major)
28 October 2020San Jon, USmonthly snow depth17.8 cm (7.0 in)2.6 cm (1.0 in)50 years37 of 100 (Notable)
28 October 2020San Jon, USdaily low max (Tie)2.2 C (36.0 F)tie44 years5 of 100 (Routine)
27 October 2020San Jon, USdaily low max-1.1 C (30.0 F)6.1 C (11.0 F)109 years51 of 100 (Notable)
27 October 2020San Jon, USdaily low min-8.3 C (17.1 F)4.4 C (7.9 F)66 years37 of 100 (Notable)
26 October 2020San Jon, USdaily low max-0.6 C (30.9 F)10.6 C (19.1 F)97 years58 of 100 (Notable)
26 October 2020San Jon, USdaily low min-8.3 C (17.1 F)3.9 C (7.0 F)107 years47 of 100 (Notable)
22 October 2020San Jon, USdaily high max (Tie)31.7 C (89.1 F)tie4 years2 of 100 (Routine)
20 October 2020San Jon, USdaily high max32.8 C (91.0 F)0.6 C (1.1 F)99 years40 of 100 (Notable)
14 October 2020San Jon, USdaily high max34.4 C (93.9 F)1.6 C (2.9 F)52 years27 of 100 (Routine)
10 October 2020San Jon, USdaily high max35.0 C (95.0 F)1.7 C (3.1 F)67 years33 of 100 (Routine)
9 October 2020San Jon, USdaily high max (Tie)35.0 C (95.0 F)tie55 years6 of 100 (Routine)
8 October 2020San Jon, USdaily high min (Tie)17.2 C (63.0 F)tie64 years7 of 100 (Routine)

Climate Trend

89 complete years, 1908 to 2018
Annual mean temperature at San Jon as warming stripes, 1908 to 2018 One stripe for each of 89 complete years at San Jon, 1908 to 2018. Blue stripes are years cooler than the station's own mean of 14.9 C (58.7 F); red stripes are warmer. The coolest year was 1944, at 13.1 C (55.6 F), and the warmest was 2012, at 17.1 C (62.8 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1908: 14.8 C, -0.1 C from the station mean1909: 14.7 C, -0.2 C from the station mean1910: 15.5 C, +0.7 C from the station mean1911: 14.6 C, -0.2 C from the station mean1913: 13.6 C, -1.3 C from the station mean1915: 13.5 C, -1.4 C from the station mean1918: 13.7 C, -1.1 C from the station mean1920: 13.3 C, -1.5 C from the station mean1921: 14.9 C, +0.1 C from the station mean1922: 14.2 C, -0.7 C from the station mean1923: 13.8 C, -1.0 C from the station mean1924: 13.8 C, -1.0 C from the station mean1931: 14.1 C, -0.8 C from the station mean1932: 13.6 C, -1.2 C from the station mean1933: 14.9 C, 0.0 C from the station mean1934: 16.0 C, +1.2 C from the station mean1935: 15.3 C, +0.4 C from the station mean1936: 15.1 C, +0.3 C from the station mean1940: 15.0 C, +0.1 C from the station mean1941: 14.0 C, -0.8 C from the station mean1942: 14.0 C, -0.9 C from the station mean1943: 14.2 C, -0.7 C from the station mean1944: 13.1 C, -1.8 C from the station mean1945: 14.6 C, -0.2 C from the station mean1946: 15.0 C, +0.1 C from the station mean1947: 14.7 C, -0.2 C from the station mean1948: 14.2 C, -0.6 C from the station mean1949: 14.1 C, -0.7 C from the station mean1950: 15.3 C, +0.4 C from the station mean1951: 15.0 C, +0.2 C from the station mean1952: 15.1 C, +0.2 C from the station mean1953: 15.6 C, +0.7 C from the station mean1955: 14.5 C, -0.4 C from the station mean1956: 15.6 C, +0.7 C from the station mean1957: 14.7 C, -0.1 C from the station mean1958: 14.2 C, -0.7 C from the station mean1959: 14.2 C, -0.6 C from the station mean1960: 13.3 C, -1.5 C from the station mean1962: 15.2 C, +0.3 C from the station mean1963: 15.5 C, +0.7 C from the station mean1964: 15.0 C, +0.2 C from the station mean1965: 14.9 C, 0.0 C from the station mean1966: 14.6 C, -0.2 C from the station mean1967: 15.1 C, +0.2 C from the station mean1968: 14.9 C, 0.0 C from the station mean1969: 14.9 C, +0.1 C from the station mean1970: 14.4 C, -0.4 C from the station mean1971: 14.5 C, -0.3 C from the station mean1972: 14.8 C, -0.1 C from the station mean1974: 15.3 C, +0.5 C from the station mean1975: 14.4 C, -0.5 C from the station mean1976: 14.7 C, -0.1 C from the station mean1977: 15.7 C, +0.8 C from the station mean1979: 14.3 C, -0.6 C from the station mean1980: 15.5 C, +0.7 C from the station mean1981: 15.8 C, +0.9 C from the station mean1982: 14.7 C, -0.1 C from the station mean1983: 14.5 C, -0.4 C from the station mean1984: 14.5 C, -0.3 C from the station mean1985: 14.8 C, 0.0 C from the station mean1986: 15.0 C, +0.1 C from the station mean1987: 14.1 C, -0.8 C from the station mean1988: 14.2 C, -0.6 C from the station mean1989: 14.9 C, 0.0 C from the station mean1990: 15.0 C, +0.1 C from the station mean1991: 14.4 C, -0.4 C from the station mean1992: 14.6 C, -0.3 C from the station mean1994: 15.5 C, +0.7 C from the station mean1995: 15.5 C, +0.6 C from the station mean1996: 15.3 C, +0.4 C from the station mean1997: 13.9 C, -0.9 C from the station mean1998: 15.5 C, +0.6 C from the station mean1999: 15.4 C, +0.6 C from the station mean2000: 16.3 C, +1.4 C from the station mean2001: 16.0 C, +1.1 C from the station mean2002: 15.3 C, +0.5 C from the station mean2004: 14.8 C, -0.1 C from the station mean2005: 15.2 C, +0.3 C from the station mean2006: 16.0 C, +1.2 C from the station mean2007: 14.9 C, +0.1 C from the station mean2008: 15.2 C, +0.3 C from the station mean2009: 15.3 C, +0.5 C from the station mean2010: 15.4 C, +0.6 C from the station mean2011: 15.8 C, +1.0 C from the station mean2012: 17.1 C, +2.3 C from the station mean2013: 15.5 C, +0.6 C from the station mean2014: 15.6 C, +0.7 C from the station mean2017: 16.6 C, +1.7 C from the station mean2018: 16.0 C, +1.1 C from the station mean19081920193019401950196019701980199020002010
One stripe for each of 89 complete years at San Jon, 1908 to 2018. Blue stripes are years cooler than the station's own mean of 14.9 C (58.7 F); red stripes are warmer. The coolest year was 1944, at 13.1 C (55.6 F), and the warmest was 2012, at 17.1 C (62.8 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at San Jon as warming stripes, 1908 to 2018
YearAnnual mean temperatureDifference from the station mean
190814.8 C-0.05 C
190914.7 C-0.18 C
191015.5 C+0.66 C
191114.6 C-0.22 C
191313.6 C-1.27 C
191513.5 C-1.37 C
191813.7 C-1.12 C
192013.3 C-1.53 C
192114.9 C+0.09 C
192214.2 C-0.69 C
192313.8 C-1.02 C
192413.8 C-1.04 C
193114.1 C-0.78 C
193213.6 C-1.21 C
193314.9 C+0.05 C
193416.0 C+1.18 C
193515.3 C+0.40 C
193615.1 C+0.28 C
194015.0 C+0.14 C
194114.0 C-0.82 C
194214.0 C-0.85 C
194314.2 C-0.66 C
194413.1 C-1.76 C
194514.6 C-0.24 C
194615.0 C+0.12 C
194714.7 C-0.16 C
194814.2 C-0.61 C
194914.1 C-0.74 C
195015.3 C+0.43 C
195115.0 C+0.19 C
195215.1 C+0.22 C
195315.6 C+0.71 C
195514.5 C-0.39 C
195615.6 C+0.72 C
195714.7 C-0.12 C
195814.2 C-0.65 C
195914.2 C-0.62 C
196013.3 C-1.53 C
196215.2 C+0.33 C
196315.5 C+0.69 C
196415.0 C+0.19 C
196514.9 C+0.05 C
196614.6 C-0.21 C
196715.1 C+0.25 C
196814.9 C+0.05 C
196914.9 C+0.07 C
197014.4 C-0.41 C
197114.5 C-0.33 C
197214.8 C-0.10 C
197415.3 C+0.48 C
197514.4 C-0.46 C
197614.7 C-0.13 C
197715.7 C+0.85 C
197914.3 C-0.56 C
198015.5 C+0.66 C
198115.8 C+0.93 C
198214.7 C-0.14 C
198314.5 C-0.35 C
198414.5 C-0.32 C
198514.8 C-0.03 C
198615.0 C+0.12 C
198714.1 C-0.79 C
198814.2 C-0.62 C
198914.9 C+0.01 C
199015.0 C+0.11 C
199114.4 C-0.44 C
199214.6 C-0.29 C
199415.5 C+0.67 C
199515.5 C+0.60 C
199615.3 C+0.43 C
199713.9 C-0.93 C
199815.5 C+0.62 C
199915.4 C+0.57 C
200016.3 C+1.40 C
200116.0 C+1.13 C
200215.3 C+0.46 C
200414.8 C-0.10 C
200515.2 C+0.31 C
200616.0 C+1.18 C
200714.9 C+0.09 C
200815.2 C+0.35 C
200915.3 C+0.49 C
201015.4 C+0.56 C
201115.8 C+0.97 C
201217.1 C+2.26 C
201315.5 C+0.61 C
201415.6 C+0.70 C
201716.6 C+1.71 C
201816.0 C+1.13 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1908 to 2018. In Fahrenheit: 0.2 F (0.2 to 0.3) per decade. The slope is a straight line fitted to 89 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Jon
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (0.1 to 0.2) per decade0.2 F (0.2 to 0.3) per decade1908 to 201889Rise
Mean daily maximum0.09 C (0.03 to 0.15) per decade0.2 F (0.1 to 0.3) per decade1908 to 201889Rise
Mean daily minimum0.2 C (0.1 to 0.2) per decade0.3 F (0.2 to 0.4) per decade1908 to 201889Rise

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

1907 to 2021
Yearly extremes at San Jon: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)43.9 C (111.0 F)201640.3 C (104.5 F)114
Coldest night (TNn)-28.9 C (-20.0 F)1919-18.3 C (-0.9 F)114
Wettest day (Rx1day)100.6 mm (4.0 in)191145.5 mm (1.8 in)114
Wettest five days (Rx5day)196.8 mm (7.7 in)197265.0 mm (2.6 in)114
Longest dry spell (CDD)112 days199645 days114

Hottest day (TXx)

Hottest day (TXx) at San Jon by year The hottest day of the year at San Jon, 1907 to 2021. The record is 43.9 C (111.0 F) in 2016, marked on the chart; the median year is 40.3 C (104.5 F). 1020304050192019401960198020002020Record: 43.9 C (111.0 F) in 2016
The hottest day of the year at San Jon, 1907 to 2021. The record is 43.9 C (111.0 F) in 2016, marked on the chart; the median year is 40.3 C (104.5 F).
Hottest day (TXx) at San Jon by year
YearHottest day (TXx)
190738.3 C (100.9 F)
190840.6 C (105.1 F)
190940.0 C (104.0 F)
191040.6 C (105.1 F)
191139.4 C (102.9 F)
191237.8 C (100.0 F)
191340.0 C (104.0 F)
191541.1 C (106.0 F)
191640.6 C (105.1 F)
191739.4 C (102.9 F)
191841.1 C (106.0 F)
191937.2 C (99.0 F)
192037.8 C (100.0 F)
192139.4 C (102.9 F)
192240.6 C (105.1 F)
192340.6 C (105.1 F)
192441.7 C (107.1 F)
192540.6 C (105.1 F)
192638.3 C (100.9 F)
192739.4 C (102.9 F)
192840.0 C (104.0 F)
192938.9 C (102.0 F)
193040.6 C (105.1 F)
193138.3 C (100.9 F)
193237.8 C (100.0 F)
193341.1 C (106.0 F)
193441.7 C (107.1 F)
193540.0 C (104.0 F)
193640.6 C (105.1 F)
193739.4 C (102.9 F)
193838.9 C (102.0 F)
193941.7 C (107.1 F)
194040.6 C (105.1 F)
194135.6 C (96.1 F)
194238.9 C (102.0 F)
194340.6 C (105.1 F)
194441.7 C (107.1 F)
194540.0 C (104.0 F)
194640.6 C (105.1 F)
194740.0 C (104.0 F)
194840.6 C (105.1 F)
194937.8 C (100.0 F)
195038.3 C (100.9 F)
195141.7 C (107.1 F)
195240.6 C (105.1 F)
195342.2 C (108.0 F)
195440.0 C (104.0 F)
195539.4 C (102.9 F)
195639.4 C (102.9 F)
195741.7 C (107.1 F)
195842.2 C (108.0 F)
195940.0 C (104.0 F)
196039.4 C (102.9 F)
196137.8 C (100.0 F)
196239.4 C (102.9 F)
196341.7 C (107.1 F)
196442.2 C (108.0 F)
196538.9 C (102.0 F)
196641.1 C (106.0 F)
196737.8 C (100.0 F)
196842.2 C (108.0 F)
196940.6 C (105.1 F)
197040.6 C (105.1 F)
197139.4 C (102.9 F)
197238.3 C (100.9 F)
197341.1 C (106.0 F)
197441.1 C (106.0 F)
197540.0 C (104.0 F)
197640.6 C (105.1 F)
197741.7 C (107.1 F)
197840.6 C (105.1 F)
197937.8 C (100.0 F)
198042.2 C (108.0 F)
198141.7 C (107.1 F)
198237.8 C (100.0 F)
198340.0 C (104.0 F)
198437.8 C (100.0 F)
198540.0 C (104.0 F)
198639.4 C (102.9 F)
198737.8 C (100.0 F)
198837.2 C (99.0 F)
198939.4 C (102.9 F)
199043.3 C (109.9 F)
199137.8 C (100.0 F)
199240.6 C (105.1 F)
199339.4 C (102.9 F)
199440.6 C (105.1 F)
199540.6 C (105.1 F)
199640.6 C (105.1 F)
199738.3 C (100.9 F)
199841.7 C (107.1 F)
199938.9 C (102.0 F)
200038.9 C (102.0 F)
200139.4 C (102.9 F)
200238.9 C (102.0 F)
200340.6 C (105.1 F)
200439.4 C (102.9 F)
200538.3 C (100.9 F)
200640.6 C (105.1 F)
200741.7 C (107.1 F)
200839.4 C (102.9 F)
200942.2 C (108.0 F)
201038.3 C (100.9 F)
201142.2 C (108.0 F)
201241.1 C (106.0 F)
201342.8 C (109.0 F)
201441.1 C (106.0 F)
201540.6 C (105.1 F)
201643.9 C (111.0 F)
201743.3 C (109.9 F)
201841.7 C (107.1 F)
201941.1 C (106.0 F)
202043.9 C (111.0 F)
202119.4 C (66.9 F)

Coldest night (TNn)

Coldest night (TNn) at San Jon by year The coldest night of the year at San Jon, 1907 to 2021. The record is -28.9 C (-20.0 F) in 1919, marked on the chart; the median year is -18.3 C (-0.9 F). -30-20-100192019401960198020002020Record: -28.9 C (-20.0 F) in 1919
The coldest night of the year at San Jon, 1907 to 2021. The record is -28.9 C (-20.0 F) in 1919, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at San Jon by year
YearColdest night (TNn)
1907-13.9 C (7.0 F)
1908-16.1 C (3.0 F)
1909-22.8 C (-9.0 F)
1910-22.8 C (-9.0 F)
1911-25.6 C (-14.1 F)
1912-20.0 C (-4.0 F)
1913-28.3 C (-18.9 F)
1915-21.7 C (-7.1 F)
1916-17.8 C (0.0 F)
1917-16.7 C (1.9 F)
1918-25.0 C (-13.0 F)
1919-28.9 C (-20.0 F)
1920-21.7 C (-7.1 F)
1921-16.7 C (1.9 F)
1922-20.6 C (-5.1 F)
1923-18.9 C (-2.0 F)
1924-23.9 C (-11.0 F)
1925-18.9 C (-2.0 F)
1926-13.9 C (7.0 F)
1927-18.9 C (-2.0 F)
1928-16.7 C (1.9 F)
1929-25.0 C (-13.0 F)
1930-21.7 C (-7.1 F)
1931-15.0 C (5.0 F)
1932-21.7 C (-7.1 F)
1933-28.3 C (-18.9 F)
1934-15.6 C (3.9 F)
1935-18.9 C (-2.0 F)
1936-18.9 C (-2.0 F)
1937-17.8 C (0.0 F)
1938-16.7 C (1.9 F)
1939-21.7 C (-7.1 F)
1940-17.8 C (0.0 F)
1941-11.7 C (10.9 F)
1942-21.1 C (-6.0 F)
1943-26.1 C (-15.0 F)
1944-19.4 C (-2.9 F)
1945-17.2 C (1.0 F)
1946-15.0 C (5.0 F)
1947-23.3 C (-9.9 F)
1948-22.8 C (-9.0 F)
1949-20.6 C (-5.1 F)
1950-21.7 C (-7.1 F)
1951-26.1 C (-15.0 F)
1952-20.0 C (-4.0 F)
1953-13.3 C (8.1 F)
1954-15.6 C (3.9 F)
1955-17.8 C (0.0 F)
1956-17.8 C (0.0 F)
1957-20.6 C (-5.1 F)
1958-18.3 C (-0.9 F)
1959-27.8 C (-18.0 F)
1960-26.1 C (-15.0 F)
1961-26.1 C (-15.0 F)
1962-25.0 C (-13.0 F)
1963-22.8 C (-9.0 F)
1964-20.6 C (-5.1 F)
1965-18.3 C (-0.9 F)
1966-23.3 C (-9.9 F)
1967-14.4 C (6.1 F)
1968-15.0 C (5.0 F)
1969-18.3 C (-0.9 F)
1970-18.3 C (-0.9 F)
1971-25.6 C (-14.1 F)
1972-18.3 C (-0.9 F)
1973-15.6 C (3.9 F)
1974-15.0 C (5.0 F)
1975-17.8 C (0.0 F)
1976-18.3 C (-0.9 F)
1977-17.8 C (0.0 F)
1978-25.0 C (-13.0 F)
1979-21.1 C (-6.0 F)
1980-15.0 C (5.0 F)
1981-18.3 C (-0.9 F)
1982-19.4 C (-2.9 F)
1983-20.0 C (-4.0 F)
1984-18.9 C (-2.0 F)
1985-22.2 C (-8.0 F)
1986-24.4 C (-11.9 F)
1987-21.1 C (-6.0 F)
1988-17.8 C (0.0 F)
1989-19.4 C (-2.9 F)
1990-23.9 C (-11.0 F)
1991-16.7 C (1.9 F)
1992-11.7 C (10.9 F)
1993-13.9 C (7.0 F)
1994-14.4 C (6.1 F)
1995-13.3 C (8.1 F)
1996-16.7 C (1.9 F)
1997-18.3 C (-0.9 F)
1998-17.8 C (0.0 F)
1999-13.3 C (8.1 F)
2000-9.4 C (15.1 F)
2001-10.6 C (12.9 F)
2002-14.4 C (6.1 F)
2003-13.9 C (7.0 F)
2004-18.9 C (-2.0 F)
2005-19.4 C (-2.9 F)
2006-14.4 C (6.1 F)
2007-17.2 C (1.0 F)
2008-15.0 C (5.0 F)
2009-16.1 C (3.0 F)
2010-16.7 C (1.9 F)
2011-26.1 C (-15.0 F)
2012-14.4 C (6.1 F)
2013-13.3 C (8.1 F)
2014-16.7 C (1.9 F)
2015-15.6 C (3.9 F)
2016-21.1 C (-6.0 F)
2017-20.6 C (-5.1 F)
2018-14.4 C (6.1 F)
2019-12.8 C (9.0 F)
2020-11.1 C (12.0 F)
2021-8.3 C (17.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Jon by year The wettest day of the year at San Jon, 1907 to 2021. The record is 100.6 mm (4.0 in) in 1911, marked on the chart; the median year is 45.5 mm (1.8 in). 0255075100125192019401960198020002020Record: 100.6 mm (4.0 in) in 1911
The wettest day of the year at San Jon, 1907 to 2021. The record is 100.6 mm (4.0 in) in 1911, marked on the chart; the median year is 45.5 mm (1.8 in).
Wettest day (Rx1day) at San Jon by year
YearWettest day (Rx1day)
190776.2 mm (3.0 in)
190867.1 mm (2.6 in)
190930.7 mm (1.2 in)
191045.0 mm (1.8 in)
1911100.6 mm (4.0 in)
191241.4 mm (1.6 in)
191343.2 mm (1.7 in)
191546.5 mm (1.8 in)
191695.5 mm (3.8 in)
191725.4 mm (1.0 in)
191844.2 mm (1.7 in)
191992.5 mm (3.6 in)
192028.2 mm (1.1 in)
192176.2 mm (3.0 in)
192234.3 mm (1.4 in)
192373.2 mm (2.9 in)
192440.9 mm (1.6 in)
192552.6 mm (2.1 in)
192688.9 mm (3.5 in)
192739.6 mm (1.6 in)
192828.2 mm (1.1 in)
192938.6 mm (1.5 in)
193090.2 mm (3.6 in)
193148.3 mm (1.9 in)
193276.2 mm (3.0 in)
193346.5 mm (1.8 in)
193434.0 mm (1.3 in)
193538.1 mm (1.5 in)
193621.6 mm (0.9 in)
193746.5 mm (1.8 in)
193850.8 mm (2.0 in)
193942.4 mm (1.7 in)
194047.2 mm (1.9 in)
194161.0 mm (2.4 in)
194232.0 mm (1.3 in)
194350.5 mm (2.0 in)
194460.7 mm (2.4 in)
194567.8 mm (2.7 in)
194645.7 mm (1.8 in)
194736.3 mm (1.4 in)
194832.5 mm (1.3 in)
194929.5 mm (1.2 in)
195032.0 mm (1.3 in)
195130.5 mm (1.2 in)
195230.7 mm (1.2 in)
195344.2 mm (1.7 in)
195431.2 mm (1.2 in)
195529.2 mm (1.1 in)
195641.1 mm (1.6 in)
195746.7 mm (1.8 in)
195840.9 mm (1.6 in)
195958.4 mm (2.3 in)
196066.5 mm (2.6 in)
196139.1 mm (1.5 in)
196264.8 mm (2.6 in)
196361.2 mm (2.4 in)
196421.8 mm (0.9 in)
196553.8 mm (2.1 in)
196646.7 mm (1.8 in)
196747.2 mm (1.9 in)
196827.9 mm (1.1 in)
196967.8 mm (2.7 in)
197058.9 mm (2.3 in)
197163.8 mm (2.5 in)
197282.8 mm (3.3 in)
197326.4 mm (1.0 in)
197447.0 mm (1.9 in)
197549.8 mm (2.0 in)
197627.9 mm (1.1 in)
197751.8 mm (2.0 in)
197844.7 mm (1.8 in)
197953.6 mm (2.1 in)
198026.9 mm (1.1 in)
198158.2 mm (2.3 in)
198255.1 mm (2.2 in)
198332.0 mm (1.3 in)
198435.1 mm (1.4 in)
198550.0 mm (2.0 in)
198693.5 mm (3.7 in)
198750.8 mm (2.0 in)
198891.4 mm (3.6 in)
198939.6 mm (1.6 in)
199038.6 mm (1.5 in)
199163.0 mm (2.5 in)
199244.2 mm (1.7 in)
199355.1 mm (2.2 in)
199441.1 mm (1.6 in)
199523.4 mm (0.9 in)
199688.9 mm (3.5 in)
199745.2 mm (1.8 in)
199839.1 mm (1.5 in)
199974.7 mm (2.9 in)
200068.6 mm (2.7 in)
200136.8 mm (1.4 in)
200228.7 mm (1.1 in)
200344.2 mm (1.7 in)
200445.7 mm (1.8 in)
200529.2 mm (1.1 in)
200621.8 mm (0.9 in)
200732.5 mm (1.3 in)
200829.5 mm (1.2 in)
200961.0 mm (2.4 in)
201045.7 mm (1.8 in)
201121.1 mm (0.8 in)
201240.4 mm (1.6 in)
201330.5 mm (1.2 in)
201466.5 mm (2.6 in)
201543.7 mm (1.7 in)
201648.8 mm (1.9 in)
201764.8 mm (2.6 in)
201847.0 mm (1.9 in)
201983.6 mm (3.3 in)
202033.3 mm (1.3 in)
20213.8 mm (0.15 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Jon by year The wettest five days of the year at San Jon, 1907 to 2021. The record is 196.8 mm (7.7 in) in 1972, marked on the chart; the median year is 65.0 mm (2.6 in). 050100150200192019401960198020002020Record: 196.8 mm (7.7 in) in 1972
The wettest five days of the year at San Jon, 1907 to 2021. The record is 196.8 mm (7.7 in) in 1972, marked on the chart; the median year is 65.0 mm (2.6 in).
Wettest five days (Rx5day) at San Jon by year
YearWettest five days (Rx5day)
1907102.9 mm (4.1 in)
190873.7 mm (2.9 in)
190941.0 mm (1.6 in)
191058.0 mm (2.3 in)
1911142.6 mm (5.6 in)
191250.8 mm (2.0 in)
191377.5 mm (3.1 in)
191590.5 mm (3.6 in)
1916149.9 mm (5.9 in)
191751.8 mm (2.0 in)
191861.7 mm (2.4 in)
1919109.0 mm (4.3 in)
192033.8 mm (1.3 in)
1921132.8 mm (5.2 in)
192252.8 mm (2.1 in)
1923167.2 mm (6.6 in)
192474.2 mm (2.9 in)
192569.4 mm (2.7 in)
1926108.0 mm (4.3 in)
192744.6 mm (1.8 in)
192841.2 mm (1.6 in)
192942.1 mm (1.7 in)
1930160.1 mm (6.3 in)
193175.9 mm (3.0 in)
193294.7 mm (3.7 in)
193377.2 mm (3.0 in)
193448.7 mm (1.9 in)
193569.2 mm (2.7 in)
193656.9 mm (2.2 in)
1937114.2 mm (4.5 in)
193851.6 mm (2.0 in)
193946.8 mm (1.8 in)
194084.6 mm (3.3 in)
1941122.5 mm (4.8 in)
194253.6 mm (2.1 in)
194354.1 mm (2.1 in)
194476.8 mm (3.0 in)
194575.3 mm (3.0 in)
194660.0 mm (2.4 in)
194746.9 mm (1.8 in)
194842.1 mm (1.7 in)
194949.2 mm (1.9 in)
195070.1 mm (2.8 in)
195197.6 mm (3.8 in)
195254.1 mm (2.1 in)
195352.3 mm (2.1 in)
195447.2 mm (1.9 in)
195548.2 mm (1.9 in)
195644.4 mm (1.7 in)
195766.0 mm (2.6 in)
195848.5 mm (1.9 in)
1959103.0 mm (4.1 in)
1960185.9 mm (7.3 in)
196164.0 mm (2.5 in)
196267.3 mm (2.6 in)
196367.0 mm (2.6 in)
196436.0 mm (1.4 in)
196560.0 mm (2.4 in)
196652.8 mm (2.1 in)
196775.2 mm (3.0 in)
196836.6 mm (1.4 in)
196989.4 mm (3.5 in)
197058.9 mm (2.3 in)
1971105.2 mm (4.1 in)
1972196.8 mm (7.7 in)
197355.6 mm (2.2 in)
197474.5 mm (2.9 in)
197549.8 mm (2.0 in)
197641.1 mm (1.6 in)
197775.7 mm (3.0 in)
197894.6 mm (3.7 in)
197972.9 mm (2.9 in)
198033.2 mm (1.3 in)
198197.0 mm (3.8 in)
198275.2 mm (3.0 in)
198352.7 mm (2.1 in)
198449.8 mm (2.0 in)
198562.7 mm (2.5 in)
1986168.7 mm (6.6 in)
198769.8 mm (2.7 in)
198899.8 mm (3.9 in)
198971.4 mm (2.8 in)
199047.2 mm (1.9 in)
1991116.9 mm (4.6 in)
199287.4 mm (3.4 in)
199374.4 mm (2.9 in)
199466.5 mm (2.6 in)
199553.6 mm (2.1 in)
1996114.3 mm (4.5 in)
199791.4 mm (3.6 in)
199893.0 mm (3.7 in)
199978.5 mm (3.1 in)
200085.4 mm (3.4 in)
200152.8 mm (2.1 in)
200228.7 mm (1.1 in)
200338.6 mm (1.5 in)
200458.5 mm (2.3 in)
200537.1 mm (1.5 in)
200642.9 mm (1.7 in)
200759.4 mm (2.3 in)
200878.5 mm (3.1 in)
200980.8 mm (3.2 in)
201046.2 mm (1.8 in)
201124.0 mm (0.9 in)
201243.9 mm (1.7 in)
201345.3 mm (1.8 in)
2014103.2 mm (4.1 in)
201558.6 mm (2.3 in)
201649.3 mm (1.9 in)
2017106.9 mm (4.2 in)
201851.6 mm (2.0 in)
2019127.0 mm (5.0 in)
202049.3 mm (1.9 in)
20215.8 mm (0.23 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Jon by year The longest dry spell of the year at San Jon, 1907 to 2021. The record is 112 days in 1996, marked on the chart; the median year is 45 days. 0255075100125192019401960198020002020Record: 112 days in 1996
The longest dry spell of the year at San Jon, 1907 to 2021. The record is 112 days in 1996, marked on the chart; the median year is 45 days.
Longest dry spell (CDD) at San Jon by year
YearLongest dry spell (CDD)
190729 days
190852 days
190969 days
191056 days
191151 days
191250 days
191327 days
191577 days
191662 days
191745 days
191859 days
191951 days
192075 days
192164 days
192256 days
192351 days
192441 days
192585 days
192677 days
192777 days
192840 days
192944 days
193044 days
193133 days
193239 days
193356 days
193440 days
193563 days
193645 days
193743 days
193845 days
193951 days
194043 days
194141 days
194259 days
1943105 days
194430 days
194549 days
194638 days
194746 days
194860 days
194929 days
195064 days
195149 days
195257 days
195365 days
195444 days
195563 days
1956108 days
195745 days
195841 days
195943 days
196066 days
196148 days
196230 days
196341 days
196442 days
196544 days
196655 days
196741 days
196832 days
196944 days
197047 days
197144 days
197240 days
197339 days
197452 days
197557 days
197660 days
197752 days
197839 days
197952 days
198038 days
198152 days
198256 days
198329 days
198436 days
198520 days
198635 days
198741 days
198856 days
198949 days
199047 days
199160 days
199252 days
199328 days
199429 days
199576 days
1996112 days
199735 days
199841 days
199937 days
200061 days
200161 days
200228 days
200344 days
200425 days
200538 days
200650 days
200743 days
200846 days
200938 days
201034 days
201145 days
201256 days
201332 days
201437 days
201535 days
201627 days
201786 days
201898 days
201950 days
202031 days
202124 days

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

89 years with a frost

Across 89 years with a frost, the median last spring frost at San Jon falls on 20 April and the median first autumn frost on 20 October, which leaves a median of 182 days between them.

In 1985 to 2018 the median growing season was 186 days. That is 6 days more than in 1908 to 1951.

Fitted over all years, the growing season changes by +0.9 days per decade at this station.

Frost dates and growing season at San Jon
MeasureMedian, all yearsEarliest period (1908 to 1951)Recent period (1985 to 2018)Recent against earliestFitted trend
Last spring frost20 April26 April15 April11 days earlier-0.9 days per decade
First autumn frost20 October22 October20 October2 days earlier+0.1 days per decade
Growing days182 days180 days186 days6 days more+0.9 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

108 years, 1908 to 2020

A day with at least 45.3 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 113.1 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at San Jon: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years45.3 mm (1.8 in)
5 years62.5 mm (2.5 in)
10 years74.3 mm (2.9 in)
25 years89.6 mm (3.5 in)
50 years101.3 mm (4.0 in)
100 years113.1 mm (4.5 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 108 years of values from 1908 to 2020.

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: 100.6 mm (4.0 in) in 1911; 95.5 mm (3.8 in) in 1916; 93.5 mm (3.7 in) in 1986.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2001 to 2018 against 1961 to 1990

Over 2001 to 2018, San Jon had a mean temperature of 15.6 C (60.2 F) and 403.1 mm (15.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Lubbock (United States, 213 km away), Roswell Ind Air Pk (United States, 228 km away) and Maljamar (United States, 254 km away).

Climate twins of San Jon: stations whose 1961 to 1990 climate is closest to its 2001 to 2018 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
LubbockUnited States213 km (132 mi)15.6 C (60.0 F)474.5 mm (18.7 in)0.65
Roswell Ind Air PkUnited States228 km (142 mi)15.9 C (60.6 F)310.9 mm (12.2 in)0.68
MaljamarUnited States254 km (158 mi)15.6 C (60.1 F)384.4 mm (15.1 in)0.77

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 San Jon standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Jon 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).