Built 2026-10-18 (18 October 2026)

Castlewood Weather Records (USC00391519)

Record envelope, standing records and threshold days for Castlewood (USC00391519), South Dakota, United States, with 119 years of record.

Key Facts for Castlewood

  • Castlewood (USC00391519) is a weather station in South Dakota, United States at 44.73 latitude and -97.03 longitude, 514 m (1,685 ft) above sea level.
  • The station reports from 1893 to 2011, 119 years of record.
  • 1,464 records set at Castlewood still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Castlewood set a daily record high minimum temperature of 15.6 C (60.1 F) on 9 October 2011.

About the Station

  • Location: South Dakota, United States, 44.73 latitude, -97.03 longitude.
  • Elevation: 514 m (1,685 ft).
  • Period of record: 1893 to 2011, 119 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 Castlewood, with 2026 drawn through them The band shows the record high and record low for each calendar day at Castlewood. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Castlewood. 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 Castlewood, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.9 C (66.0 F)-40.6 C (-41.1 F)n/an/a
Feb19.4 C (66.9 F)-42.2 C (-44.0 F)n/an/a
Mar28.9 C (84.0 F)-33.9 C (-29.0 F)n/an/a
Apr36.1 C (97.0 F)-20.6 C (-5.1 F)n/an/a
May41.1 C (106.0 F)-11.1 C (12.0 F)n/an/a
Jun42.2 C (108.0 F)-4.4 C (24.1 F)n/an/a
Jul42.8 C (109.0 F)0.6 C (33.1 F)n/an/a
Aug40.6 C (105.1 F)-1.1 C (30.0 F)n/an/a
Sep39.4 C (102.9 F)-12.8 C (9.0 F)n/an/a
Oct32.8 C (91.0 F)-20.0 C (-4.0 F)n/an/a
Nov26.1 C (79.0 F)-30.6 C (-23.1 F)n/an/a
Dec21.7 C (71.1 F)-38.3 C (-36.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Castlewood by the year they were set 1,464 records at Castlewood still stand. 1936 holds the most, with 50. 02040601893: 251894: 211895: 261896: 191897: 281898: 11905: 11906: 151907: 101908: 151909: 201910: 181911: 231912: 171913: 171914: 161915: 151916: 181917: 201918: 141919: 121920: 61921: 221922: 81923: 151924: 131925: 221926: 121927: 261928: 191929: 141930: 201931: 341932: 121933: 181934: 381935: 211936: 501937: 191938: 71939: 261940: 191941: 241942: 131943: 121944: 151945: 111946: 111947: 101948: 111949: 41950: 61951: 111952: 51953: 141954: 41955: 141956: 91957: 51958: 71959: 101960: 71961: 51962: 181963: 121964: 71965: 61966: 111967: 111968: 91969: 101970: 81971: 61972: 61973: 81974: 81975: 61976: 181977: 141978: 21979: 41980: 81981: 91982: 51983: 161984: 61985: 101986: 71987: 141988: 121989: 121990: 171991: 201992: 181993: 101994: 101995: 41996: 121997: 111998: 51999: 62000: 172001: 22002: 92003: 72004: 102005: 82006: 42007: 62008: 82009: 202010: 52011: 121893191119231935194719591971198319952007
1,464 records at Castlewood still stand. 1936 holds the most, with 50.
Standing records at Castlewood by the year they were set
Year setStanding records
189325
189421
189526
189619
189728
18981
19051
190615
190710
190815
190920
191018
191123
191217
191317
191416
191515
191618
191720
191814
191912
19206
192122
19228
192315
192413
192522
192612
192726
192819
192914
193020
193134
193212
193318
193438
193521
193650
193719
19387
193926
194019
194124
194213
194312
194415
194511
194611
194710
194811
19494
19506
195111
19525
195314
19544
195514
19569
19575
19587
195910
19607
19615
196218
196312
19647
19656
196611
196711
19689
196910
19708
19716
19726
19738
19748
19756
197618
197714
19782
19794
19808
19819
19825
198316
19846
198510
19867
198714
198812
198912
199017
199120
199218
199310
199410
19954
199612
199711
19985
19996
200017
20012
20029
20037
200410
20058
20064
20076
20088
200920
20105
201112

All-Time Record Progression

14 new records
When Castlewood set new all-time records 14 all-time records were set at Castlewood between 26 May 1931 and 6 February 2011. Each dot is a new record. Record daily precipitationRecord high minimum temperatureRecord high maximum temperatureRecord low minimum temperatureRecord daily snowfallRecord snow depth26 May 1931: Record daily precipitation 122.7 mm (4.8 in)28 July 1931: Record high minimum temperature 23.9 C (75.0 F)29 July 1933: Record high maximum temperature 41.7 C (107.1 F)31 May 1934: Record high minimum temperature 24.4 C (75.9 F)21 July 1934: Record high maximum temperature 42.8 C (109.0 F)16 February 1936: Record low minimum temperature -41.7 C (-43.1 F)9 July 1936: Record high minimum temperature 25.6 C (78.1 F)24 March 1937: Record daily snowfall 30.5 cm (12.0 in)13 July 1939: Record high minimum temperature 26.1 C (79.0 F)13 July 1966: Record daily precipitation 133.4 mm (5.3 in)9 February 1994: Record low minimum temperature -42.2 C (-44.0 F)26 April 2008: Record daily snowfall 38.1 cm (15.0 in)1 February 2011: Record snow depth 86.4 cm (34.0 in)6 February 2011: Record snow depth 94.0 cm (37.0 in)193519501965198019952010
14 all-time records were set at Castlewood between 26 May 1931 and 6 February 2011. Each dot is a new record.
When Castlewood set new all-time records
DateKindDetail
1931-05-26Record daily precipitationRecord daily precipitation 122.7 mm (4.8 in)
1931-07-28Record high minimum temperatureRecord high minimum temperature 23.9 C (75.0 F)
1933-07-29Record high maximum temperatureRecord high maximum temperature 41.7 C (107.1 F)
1934-05-31Record high minimum temperatureRecord high minimum temperature 24.4 C (75.9 F)
1934-07-21Record high maximum temperatureRecord high maximum temperature 42.8 C (109.0 F)
1936-02-16Record low minimum temperatureRecord low minimum temperature -41.7 C (-43.1 F)
1936-07-09Record high minimum temperatureRecord high minimum temperature 25.6 C (78.1 F)
1937-03-24Record daily snowfallRecord daily snowfall 30.5 cm (12.0 in)
1939-07-13Record high minimum temperatureRecord high minimum temperature 26.1 C (79.0 F)
1966-07-13Record daily precipitationRecord daily precipitation 133.4 mm (5.3 in)
1994-02-09Record low minimum temperatureRecord low minimum temperature -42.2 C (-44.0 F)
2008-04-26Record daily snowfallRecord daily snowfall 38.1 cm (15.0 in)
2011-02-01Record snow depthRecord snow depth 86.4 cm (34.0 in)
2011-02-06Record snow depthRecord snow depth 94.0 cm (37.0 in)

Wettest Day of Each Month

Jul: 133.4 mm (5.3 in)
Record daily precipitation for each month at Castlewood The wettest day on record for each calendar month at Castlewood. The most was 133.4 mm (5.3 in) on 13 July 1966. 050100150 Jan: 53.3 mm (2.1 in), 15 January 2002 Jan Feb: 40.6 mm (1.6 in), 23 February 1977 Feb Mar: 109.2 mm (4.3 in), 23 March 2009 Mar Apr: 82.3 mm (3.2 in), 6 April 2001 Apr May: 122.7 mm (4.8 in), 26 May 1931 May Jun: 112.8 mm (4.4 in), 17 June 1992 Jun Jul: 133.4 mm (5.3 in), 13 July 1966 Jul Aug: 113.3 mm (4.5 in), 27 August 1978 Aug Sep: 81.8 mm (3.2 in), 8 September 1985 Sep Oct: 66.0 mm (2.6 in), 5 October 1946 Oct Nov: 50.8 mm (2.0 in), 26 November 1897 Nov Dec: 24.4 mm (1.0 in), 11 December 1949 Dec
The wettest day on record for each calendar month at Castlewood. The most was 133.4 mm (5.3 in) on 13 July 1966.
Record daily precipitation for each month at Castlewood
MonthRecord daily precipitation (mm)Date
Jan53.3 mm (2.1 in)15 January 2002
Feb40.6 mm (1.6 in)23 February 1977
Mar109.2 mm (4.3 in)23 March 2009
Apr82.3 mm (3.2 in)6 April 2001
May122.7 mm (4.8 in)26 May 1931
Jun112.8 mm (4.4 in)17 June 1992
Jul133.4 mm (5.3 in)13 July 1966
Aug113.3 mm (4.5 in)27 August 1978
Sep81.8 mm (3.2 in)8 September 1985
Oct66.0 mm (2.6 in)5 October 1946
Nov50.8 mm (2.0 in)26 November 1897
Dec24.4 mm (1.0 in)11 December 1949

Period of Record Coverage

1893 to 2011
Days with data per year at Castlewood 113 years of record at Castlewood, 1893 to 2011. 16 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1896, 1897, 1898, 1905, 1947, 1948 and others. 1893: 326 of 365 days1894: 277 of 365 days1895: 347 of 365 days1896: 299 of 366 days1897: 328 of 365 days1898: 98 of 365 days1905: 60 of 365 days1906: 365 of 365 days1907: 364 of 365 days1908: 366 of 366 days1909: 364 of 365 days1910: 335 of 365 days1911: 365 of 365 days1912: 366 of 366 days1913: 365 of 365 days1914: 365 of 365 days1915: 365 of 365 days1916: 365 of 366 days1917: 365 of 365 days1918: 365 of 365 days1919: 365 of 365 days1920: 366 of 366 days1921: 365 of 365 days1922: 365 of 365 days1923: 365 of 365 days1924: 366 of 366 days1925: 365 of 365 days1926: 365 of 365 days1927: 364 of 365 days1928: 366 of 366 days1929: 365 of 365 days1930: 365 of 365 days1931: 365 of 365 days1932: 366 of 366 days1933: 365 of 365 days1934: 365 of 365 days1935: 365 of 365 days1936: 363 of 366 days1937: 361 of 365 days1938: 362 of 365 days1939: 365 of 365 days1940: 366 of 366 days1941: 365 of 365 days1942: 365 of 365 days1943: 365 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 353 of 365 days1947: 327 of 365 days1948: 290 of 366 days1949: 302 of 365 days1950: 294 of 365 days1951: 355 of 365 days1952: 353 of 366 days1953: 357 of 365 days1954: 357 of 365 days1955: 354 of 365 days1956: 356 of 366 days1957: 357 of 365 days1958: 358 of 365 days1959: 359 of 365 days1960: 356 of 366 days1961: 361 of 365 days1962: 356 of 365 days1963: 354 of 365 days1964: 359 of 366 days1965: 357 of 365 days1966: 355 of 365 days1967: 358 of 365 days1968: 324 of 366 days1969: 352 of 365 days1970: 359 of 365 days1971: 356 of 365 days1972: 358 of 366 days1973: 359 of 365 days1974: 362 of 365 days1975: 358 of 365 days1976: 363 of 366 days1977: 361 of 365 days1978: 358 of 365 days1979: 359 of 365 days1980: 349 of 366 days1981: 350 of 365 days1982: 351 of 365 days1983: 353 of 365 days1984: 354 of 366 days1985: 353 of 365 days1986: 312 of 365 days1987: 364 of 365 days1988: 365 of 366 days1989: 362 of 365 days1990: 364 of 365 days1991: 364 of 365 days1992: 364 of 366 days1993: 363 of 365 days1994: 362 of 365 days1995: 314 of 365 days1996: 355 of 366 days1997: 362 of 365 days1998: 285 of 365 days1999: 351 of 365 days2000: 335 of 366 days2001: 324 of 365 days2002: 330 of 365 days2003: 358 of 365 days2004: 362 of 366 days2005: 364 of 365 days2006: 364 of 365 days2007: 362 of 365 days2008: 351 of 366 days2009: 362 of 365 days2010: 357 of 365 days2011: 299 of 365 days19051920193519501965198019952010
113 years of record at Castlewood, 1893 to 2011. 16 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1896, 1897, 1898, 1905, 1947, 1948 and others.
Days with data per year at Castlewood
YearDays with dataShare of yearComplete
189332689%No
189427776%No
189534795%Yes
189629982%No
189732890%No
18989827%No
19056016%No
1906365100%Yes
1907364100%Yes
1908366100%Yes
1909364100%Yes
191033592%Yes
1911365100%Yes
1912366100%Yes
1913365100%Yes
1914365100%Yes
1915365100%Yes
1916365100%Yes
1917365100%Yes
1918365100%Yes
1919365100%Yes
1920366100%Yes
1921365100%Yes
1922365100%Yes
1923365100%Yes
1924366100%Yes
1925365100%Yes
1926365100%Yes
1927364100%Yes
1928366100%Yes
1929365100%Yes
1930365100%Yes
1931365100%Yes
1932366100%Yes
1933365100%Yes
1934365100%Yes
1935365100%Yes
193636399%Yes
193736199%Yes
193836299%Yes
1939365100%Yes
1940366100%Yes
1941365100%Yes
1942365100%Yes
1943365100%Yes
1944366100%Yes
1945365100%Yes
194635397%Yes
194732790%No
194829079%No
194930283%No
195029481%No
195135597%Yes
195235396%Yes
195335798%Yes
195435798%Yes
195535497%Yes
195635697%Yes
195735798%Yes
195835898%Yes
195935998%Yes
196035697%Yes
196136199%Yes
196235698%Yes
196335497%Yes
196435998%Yes
196535798%Yes
196635597%Yes
196735898%Yes
196832489%No
196935296%Yes
197035998%Yes
197135698%Yes
197235898%Yes
197335998%Yes
197436299%Yes
197535898%Yes
197636399%Yes
197736199%Yes
197835898%Yes
197935998%Yes
198034995%Yes
198135096%Yes
198235196%Yes
198335397%Yes
198435497%Yes
198535397%Yes
198631285%No
1987364100%Yes
1988365100%Yes
198936299%Yes
1990364100%Yes
1991364100%Yes
199236499%Yes
199336399%Yes
199436299%Yes
199531486%No
199635597%Yes
199736299%Yes
199828578%No
199935196%Yes
200033592%Yes
200132489%No
200233090%Yes
200335898%Yes
200436299%Yes
2005364100%Yes
2006364100%Yes
200736299%Yes
200835196%Yes
200936299%Yes
201035798%Yes
201129982%No

Latest Records

20
Latest records at Castlewood
DateStationRecordValueBeat old record byOld record stoodSignificance
9 October 2011Castlewood, USdaily high min15.6 C (60.1 F)1.2 C (2.2 F)8 years14 of 100 (Routine)
7 October 2011Castlewood, USdaily high min16.7 C (62.1 F)3.9 C (7.0 F)26 years24 of 100 (Routine)
6 October 2011Castlewood, USdaily high max (Tie)30.0 C (86.0 F)tie40 years5 of 100 (Routine)
4 October 2011Castlewood, USmonthly high min18.9 C (66.0 F)1.1 C (2.0 F)97 years50 of 100 (Notable)
29 September 2011Castlewood, USdaily high max32.8 C (91.0 F)1.1 C (2.0 F)113 years41 of 100 (Notable)
1 August 2011Castlewood, USdaily high min23.3 C (73.9 F)1.6 C (2.9 F)46 years27 of 100 (Routine)
20 July 2011Castlewood, USdaily high min23.9 C (75.0 F)0.6 C (1.1 F)76 years34 of 100 (Routine)
19 July 2011Castlewood, USdaily high min24.4 C (75.9 F)1.1 C (2.0 F)8 years14 of 100 (Routine)
18 July 2011Castlewood, USdaily high min23.3 C (73.9 F)1.1 C (2.0 F)74 years34 of 100 (Routine)
17 July 2011Castlewood, USdaily high min23.9 C (75.0 F)1.1 C (2.0 F)74 years34 of 100 (Routine)
16 July 2011Castlewood, USdaily high min23.9 C (75.0 F)2.2 C (4.0 F)80 years39 of 100 (Notable)
23 June 2011Castlewood, USdaily low max15.6 C (60.1 F)0.5 C (0.9 F)104 years40 of 100 (Notable)
22 June 2011Castlewood, USdaily low max (Tie)16.1 C (61.0 F)tie41 years5 of 100 (Routine)
21 June 2011Castlewood, USdaily rain36.1 mm (1.4 in)4.3 mm (0.17 in)20 years19 of 100 (Routine)
7 June 2011Castlewood, USdaily high max36.7 C (98.1 F)1.1 C (2.0 F)24 years19 of 100 (Routine)
7 June 2011Castlewood, USdaily high min (Tie)20.0 C (68.0 F)tie58 years6 of 100 (Routine)
22 March 2011Castlewood, USdaily rain19.1 mm (0.8 in)2.6 mm (0.10 in)32 years20 of 100 (Routine)
18 March 2011Castlewood, USdaily snow depth50.8 cm (20.0 in)2.5 cm (1.0 in)41 years23 of 100 (Routine)
17 March 2011Castlewood, USdaily snow depth63.5 cm (25.0 in)12.7 cm (5.0 in)41 years30 of 100 (Routine)
16 March 2011Castlewood, USdaily snow depth68.6 cm (27.0 in)12.7 cm (5.0 in)41 years30 of 100 (Routine)

Climate Trend

93 complete years, 1895 to 2010
Annual mean temperature at Castlewood as warming stripes, 1895 to 2010 One stripe for each of 93 complete years at Castlewood, 1895 to 2010. Blue stripes are years cooler than the station's own mean of 6.1 C (43.0 F); red stripes are warmer. The coolest year was 2008, at 3.3 C (37.9 F), and the warmest was 1931, at 9.1 C (48.4 F). The strongest colour marks a difference of 3.0 C (5.4 F). 1895: 5.1 C, -1.0 C from the station mean1906: 5.9 C, -0.2 C from the station mean1907: 4.5 C, -1.6 C from the station mean1908: 6.4 C, +0.3 C from the station mean1909: 5.2 C, -0.9 C from the station mean1911: 5.8 C, -0.3 C from the station mean1912: 5.1 C, -1.0 C from the station mean1913: 6.4 C, +0.3 C from the station mean1914: 6.2 C, 0.0 C from the station mean1915: 5.8 C, -0.4 C from the station mean1916: 4.5 C, -1.6 C from the station mean1917: 4.1 C, -2.1 C from the station mean1918: 6.3 C, +0.2 C from the station mean1919: 5.8 C, -0.3 C from the station mean1920: 6.0 C, -0.2 C from the station mean1921: 7.7 C, +1.6 C from the station mean1922: 6.5 C, +0.3 C from the station mean1923: 6.7 C, +0.5 C from the station mean1924: 4.9 C, -1.2 C from the station mean1925: 6.4 C, +0.3 C from the station mean1926: 6.1 C, 0.0 C from the station mean1927: 5.6 C, -0.5 C from the station mean1928: 6.6 C, +0.5 C from the station mean1929: 4.8 C, -1.3 C from the station mean1930: 7.1 C, +1.0 C from the station mean1931: 9.1 C, +3.0 C from the station mean1932: 6.0 C, -0.1 C from the station mean1933: 7.5 C, +1.4 C from the station mean1934: 8.0 C, +1.9 C from the station mean1935: 6.5 C, +0.4 C from the station mean1936: 5.4 C, -0.8 C from the station mean1937: 5.3 C, -0.9 C from the station mean1938: 7.2 C, +1.1 C from the station mean1939: 7.4 C, +1.2 C from the station mean1940: 6.2 C, 0.0 C from the station mean1941: 7.9 C, +1.8 C from the station mean1942: 6.4 C, +0.3 C from the station mean1943: 5.6 C, -0.5 C from the station mean1944: 6.5 C, +0.4 C from the station mean1945: 5.6 C, -0.5 C from the station mean1946: 7.1 C, +1.0 C from the station mean1951: 4.5 C, -1.7 C from the station mean1952: 6.5 C, +0.4 C from the station mean1953: 7.0 C, +0.8 C from the station mean1954: 6.9 C, +0.8 C from the station mean1955: 6.5 C, +0.3 C from the station mean1956: 5.8 C, -0.3 C from the station mean1957: 6.2 C, +0.1 C from the station mean1958: 6.4 C, +0.3 C from the station mean1959: 6.2 C, +0.1 C from the station mean1960: 5.4 C, -0.7 C from the station mean1961: 5.9 C, -0.2 C from the station mean1962: 5.9 C, -0.2 C from the station mean1963: 7.0 C, +0.8 C from the station mean1964: 6.8 C, +0.7 C from the station mean1965: 5.5 C, -0.6 C from the station mean1966: 5.6 C, -0.5 C from the station mean1967: 6.2 C, 0.0 C from the station mean1969: 5.7 C, -0.4 C from the station mean1970: 6.1 C, 0.0 C from the station mean1971: 6.3 C, +0.2 C from the station mean1972: 5.3 C, -0.8 C from the station mean1973: 7.6 C, +1.5 C from the station mean1974: 6.9 C, +0.8 C from the station mean1975: 6.3 C, +0.2 C from the station mean1976: 7.4 C, +1.3 C from the station mean1977: 6.9 C, +0.8 C from the station mean1978: 5.5 C, -0.6 C from the station mean1979: 5.2 C, -0.9 C from the station mean1980: 7.3 C, +1.1 C from the station mean1981: 8.0 C, +1.9 C from the station mean1982: 6.0 C, -0.1 C from the station mean1983: 7.1 C, +0.9 C from the station mean1984: 6.9 C, +0.8 C from the station mean1985: 5.7 C, -0.5 C from the station mean1987: 8.4 C, +2.2 C from the station mean1988: 6.2 C, 0.0 C from the station mean1989: 4.9 C, -1.2 C from the station mean1990: 6.6 C, +0.5 C from the station mean1991: 6.6 C, +0.5 C from the station mean1992: 5.5 C, -0.6 C from the station mean1993: 3.7 C, -2.4 C from the station mean1994: 5.0 C, -1.1 C from the station mean1997: 4.9 C, -1.2 C from the station mean1999: 7.5 C, +1.3 C from the station mean2003: 5.6 C, -0.5 C from the station mean2004: 6.1 C, -0.1 C from the station mean2005: 6.5 C, +0.4 C from the station mean2006: 6.6 C, +0.4 C from the station mean2007: 5.5 C, -0.6 C from the station mean2008: 3.3 C, -2.9 C from the station mean2009: 3.5 C, -2.7 C from the station mean2010: 5.5 C, -0.7 C from the station mean1895190019101920193019401950196019701980199020002010
One stripe for each of 93 complete years at Castlewood, 1895 to 2010. Blue stripes are years cooler than the station's own mean of 6.1 C (43.0 F); red stripes are warmer. The coolest year was 2008, at 3.3 C (37.9 F), and the warmest was 1931, at 9.1 C (48.4 F). The strongest colour marks a difference of 3.0 C (5.4 F).
Annual mean temperature at Castlewood as warming stripes, 1895 to 2010
YearAnnual mean temperatureDifference from the station mean
18955.1 C-1.01 C
19065.9 C-0.21 C
19074.5 C-1.59 C
19086.4 C+0.26 C
19095.2 C-0.91 C
19115.8 C-0.31 C
19125.1 C-0.99 C
19136.4 C+0.32 C
19146.2 C+0.05 C
19155.8 C-0.36 C
19164.5 C-1.61 C
19174.1 C-2.06 C
19186.3 C+0.21 C
19195.8 C-0.28 C
19206.0 C-0.17 C
19217.7 C+1.56 C
19226.5 C+0.33 C
19236.7 C+0.54 C
19244.9 C-1.20 C
19256.4 C+0.28 C
19266.1 C-0.01 C
19275.6 C-0.54 C
19286.6 C+0.50 C
19294.8 C-1.28 C
19307.1 C+1.01 C
19319.1 C+2.97 C
19326.0 C-0.12 C
19337.5 C+1.40 C
19348.0 C+1.92 C
19356.5 C+0.36 C
19365.4 C-0.75 C
19375.3 C-0.86 C
19387.2 C+1.06 C
19397.4 C+1.24 C
19406.2 C+0.03 C
19417.9 C+1.76 C
19426.4 C+0.30 C
19435.6 C-0.48 C
19446.5 C+0.41 C
19455.6 C-0.49 C
19467.1 C+1.01 C
19514.5 C-1.66 C
19526.5 C+0.36 C
19537.0 C+0.83 C
19546.9 C+0.77 C
19556.5 C+0.33 C
19565.8 C-0.30 C
19576.2 C+0.06 C
19586.4 C+0.30 C
19596.2 C+0.09 C
19605.4 C-0.68 C
19615.9 C-0.22 C
19625.9 C-0.19 C
19637.0 C+0.85 C
19646.8 C+0.69 C
19655.5 C-0.64 C
19665.6 C-0.48 C
19676.2 C+0.05 C
19695.7 C-0.38 C
19706.1 C+0.02 C
19716.3 C+0.20 C
19725.3 C-0.79 C
19737.6 C+1.52 C
19746.9 C+0.81 C
19756.3 C+0.21 C
19767.4 C+1.26 C
19776.9 C+0.78 C
19785.5 C-0.64 C
19795.2 C-0.93 C
19807.3 C+1.15 C
19818.0 C+1.90 C
19826.0 C-0.11 C
19837.1 C+0.95 C
19846.9 C+0.81 C
19855.7 C-0.45 C
19878.4 C+2.23 C
19886.2 C+0.05 C
19894.9 C-1.19 C
19906.6 C+0.47 C
19916.6 C+0.48 C
19925.5 C-0.60 C
19933.7 C-2.39 C
19945.0 C-1.08 C
19974.9 C-1.23 C
19997.5 C+1.35 C
20035.6 C-0.53 C
20046.1 C-0.05 C
20056.5 C+0.41 C
20066.6 C+0.43 C
20075.5 C-0.64 C
20083.3 C-2.85 C
20093.5 C-2.66 C
20105.5 C-0.65 C

The fitted trend in annual mean temperature here over 1895 to 2010 is -0.01 C (-0.08 to 0.06) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.03 F (-0.15 to 0.10) per decade. The slope is a straight line fitted to 93 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Castlewood
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.01 C (-0.08 to 0.06) per decade-0.03 F (-0.15 to 0.10) per decade1895 to 201093Not clearly different from zero
Mean daily maximum-0.01 C (-0.10 to 0.07) per decade-0.03 F (-0.18 to 0.13) per decade1895 to 201093Not clearly different from zero
Mean daily minimum-0.01 C (-0.08 to 0.05) per decade-0.03 F (-0.15 to 0.10) per decade1895 to 201093Not clearly different from zero

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

1893 to 2011
Yearly extremes at Castlewood: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)193436.7 C (98.1 F)113
Coldest night (TNn)-42.2 C (-44.0 F)1994-33.3 C (-27.9 F)113
Wettest day (Rx1day)133.4 mm (5.3 in)196650.0 mm (2.0 in)113
Wettest five days (Rx5day)191.4 mm (7.5 in)199275.9 mm (3.0 in)113
Longest dry spell (CDD)74 days193932 days113

Hottest day (TXx)

Hottest day (TXx) at Castlewood by year The hottest day of the year at Castlewood, 1893 to 2011. The record is 42.8 C (109.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F). 1020304050190019201940196019802000Record: 42.8 C (109.0 F) in 1934
The hottest day of the year at Castlewood, 1893 to 2011. The record is 42.8 C (109.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Castlewood by year
YearHottest day (TXx)
189338.9 C (102.0 F)
189441.1 C (106.0 F)
189539.4 C (102.9 F)
189638.3 C (100.9 F)
189736.7 C (98.1 F)
189824.4 C (75.9 F)
190518.3 C (64.9 F)
190636.7 C (98.1 F)
190735.0 C (95.0 F)
190837.2 C (99.0 F)
190933.9 C (93.0 F)
191035.0 C (95.0 F)
191137.2 C (99.0 F)
191235.0 C (95.0 F)
191337.2 C (99.0 F)
191436.7 C (98.1 F)
191531.7 C (89.1 F)
191636.7 C (98.1 F)
191738.9 C (102.0 F)
191833.9 C (93.0 F)
191935.6 C (96.1 F)
192034.4 C (93.9 F)
192135.6 C (96.1 F)
192237.2 C (99.0 F)
192333.9 C (93.0 F)
192432.2 C (90.0 F)
192536.7 C (98.1 F)
192639.4 C (102.9 F)
192736.1 C (97.0 F)
192835.0 C (95.0 F)
192937.2 C (99.0 F)
193040.0 C (104.0 F)
193140.0 C (104.0 F)
193237.2 C (99.0 F)
193341.7 C (107.1 F)
193442.8 C (109.0 F)
193537.8 C (100.0 F)
193642.2 C (108.0 F)
193740.0 C (104.0 F)
193839.4 C (102.9 F)
193937.8 C (100.0 F)
194042.8 C (109.0 F)
194140.6 C (105.1 F)
194234.4 C (93.9 F)
194335.0 C (95.0 F)
194435.6 C (96.1 F)
194535.6 C (96.1 F)
194637.2 C (99.0 F)
194740.6 C (105.1 F)
194836.7 C (98.1 F)
194936.7 C (98.1 F)
195033.9 C (93.0 F)
195134.4 C (93.9 F)
195235.6 C (96.1 F)
195335.6 C (96.1 F)
195437.2 C (99.0 F)
195538.3 C (100.9 F)
195636.7 C (98.1 F)
195736.7 C (98.1 F)
195837.2 C (99.0 F)
195937.8 C (100.0 F)
196036.7 C (98.1 F)
196136.7 C (98.1 F)
196235.0 C (95.0 F)
196336.1 C (97.0 F)
196438.3 C (100.9 F)
196539.4 C (102.9 F)
196641.7 C (107.1 F)
196736.7 C (98.1 F)
196837.2 C (99.0 F)
196937.2 C (99.0 F)
197037.8 C (100.0 F)
197137.2 C (99.0 F)
197235.6 C (96.1 F)
197337.8 C (100.0 F)
197437.8 C (100.0 F)
197536.7 C (98.1 F)
197640.6 C (105.1 F)
197737.8 C (100.0 F)
197835.6 C (96.1 F)
197936.1 C (97.0 F)
198036.1 C (97.0 F)
198135.6 C (96.1 F)
198236.7 C (98.1 F)
198337.8 C (100.0 F)
198436.7 C (98.1 F)
198537.8 C (100.0 F)
198634.4 C (93.9 F)
198736.7 C (98.1 F)
198840.0 C (104.0 F)
198936.7 C (98.1 F)
199035.0 C (95.0 F)
199136.7 C (98.1 F)
199232.8 C (91.0 F)
199332.8 C (91.0 F)
199431.7 C (89.1 F)
199534.4 C (93.9 F)
199633.3 C (91.9 F)
199733.9 C (93.0 F)
199833.3 C (91.9 F)
199936.1 C (97.0 F)
200036.7 C (98.1 F)
200135.0 C (95.0 F)
200238.9 C (102.0 F)
200335.6 C (96.1 F)
200433.9 C (93.0 F)
200536.1 C (97.0 F)
200637.2 C (99.0 F)
200736.1 C (97.0 F)
200833.3 C (91.9 F)
200933.9 C (93.0 F)
201035.0 C (95.0 F)
201136.7 C (98.1 F)

Coldest night (TNn)

Coldest night (TNn) at Castlewood by year The coldest night of the year at Castlewood, 1893 to 2011. The record is -42.2 C (-44.0 F) in 1994, marked on the chart; the median year is -33.3 C (-27.9 F). -45-40-35-30-25190019201940196019802000Record: -42.2 C (-44.0 F) in 1994
The coldest night of the year at Castlewood, 1893 to 2011. The record is -42.2 C (-44.0 F) in 1994, marked on the chart; the median year is -33.3 C (-27.9 F).
Coldest night (TNn) at Castlewood by year
YearColdest night (TNn)
1893-37.8 C (-36.0 F)
1894-37.8 C (-36.0 F)
1895-38.3 C (-36.9 F)
1896-31.1 C (-24.0 F)
1897-36.1 C (-33.0 F)
1898-25.0 C (-13.0 F)
1905-25.0 C (-13.0 F)
1906-30.0 C (-22.0 F)
1907-36.7 C (-34.1 F)
1908-30.0 C (-22.0 F)
1909-36.1 C (-33.0 F)
1910-30.6 C (-23.1 F)
1911-33.9 C (-29.0 F)
1912-40.6 C (-41.1 F)
1913-31.1 C (-24.0 F)
1914-35.0 C (-31.0 F)
1915-34.4 C (-29.9 F)
1916-40.6 C (-41.1 F)
1917-38.3 C (-36.9 F)
1918-35.0 C (-31.0 F)
1919-33.3 C (-27.9 F)
1920-30.6 C (-23.1 F)
1921-29.4 C (-20.9 F)
1922-32.2 C (-26.0 F)
1923-28.3 C (-18.9 F)
1924-35.6 C (-32.1 F)
1925-30.0 C (-22.0 F)
1926-36.1 C (-33.0 F)
1927-31.1 C (-24.0 F)
1928-33.3 C (-27.9 F)
1929-41.1 C (-42.0 F)
1930-35.0 C (-31.0 F)
1931-26.1 C (-15.0 F)
1932-32.8 C (-27.0 F)
1933-33.3 C (-27.9 F)
1934-28.3 C (-18.9 F)
1935-33.9 C (-29.0 F)
1936-41.7 C (-43.1 F)
1937-33.9 C (-29.0 F)
1938-32.2 C (-26.0 F)
1939-34.4 C (-29.9 F)
1940-32.8 C (-27.0 F)
1941-29.4 C (-20.9 F)
1942-33.9 C (-29.0 F)
1943-36.7 C (-34.1 F)
1944-30.0 C (-22.0 F)
1945-31.7 C (-25.1 F)
1946-30.0 C (-22.0 F)
1947-29.4 C (-20.9 F)
1948-37.2 C (-35.0 F)
1949-32.2 C (-26.0 F)
1950-28.3 C (-18.9 F)
1951-34.4 C (-29.9 F)
1952-34.4 C (-29.9 F)
1953-31.1 C (-24.0 F)
1954-36.1 C (-33.0 F)
1955-34.4 C (-29.9 F)
1956-33.9 C (-29.0 F)
1957-31.7 C (-25.1 F)
1958-33.9 C (-29.0 F)
1959-34.4 C (-29.9 F)
1960-33.9 C (-29.0 F)
1961-33.3 C (-27.9 F)
1962-40.0 C (-40.0 F)
1963-37.2 C (-35.0 F)
1964-31.7 C (-25.1 F)
1965-34.4 C (-29.9 F)
1966-33.3 C (-27.9 F)
1967-37.8 C (-36.0 F)
1968-33.3 C (-27.9 F)
1969-31.7 C (-25.1 F)
1970-37.8 C (-36.0 F)
1971-33.3 C (-27.9 F)
1972-37.2 C (-35.0 F)
1973-33.9 C (-29.0 F)
1974-35.6 C (-32.1 F)
1975-31.7 C (-25.1 F)
1976-32.8 C (-27.0 F)
1977-35.0 C (-31.0 F)
1978-34.4 C (-29.9 F)
1979-33.3 C (-27.9 F)
1980-28.9 C (-20.0 F)
1981-35.6 C (-32.1 F)
1982-35.0 C (-31.0 F)
1983-33.3 C (-27.9 F)
1984-31.7 C (-25.1 F)
1985-33.3 C (-27.9 F)
1986-31.1 C (-24.0 F)
1987-31.7 C (-25.1 F)
1988-38.3 C (-36.9 F)
1989-34.4 C (-29.9 F)
1990-33.9 C (-29.0 F)
1991-27.8 C (-18.0 F)
1992-28.9 C (-20.0 F)
1993-36.1 C (-33.0 F)
1994-42.2 C (-44.0 F)
1995-30.0 C (-22.0 F)
1996-36.7 C (-34.1 F)
1997-32.2 C (-26.0 F)
1998-25.0 C (-13.0 F)
1999-32.2 C (-26.0 F)
2000-30.6 C (-23.1 F)
2001-31.7 C (-25.1 F)
2002-29.4 C (-20.9 F)
2003-31.1 C (-24.0 F)
2004-32.8 C (-27.0 F)
2005-36.7 C (-34.1 F)
2006-26.1 C (-15.0 F)
2007-34.4 C (-29.9 F)
2008-32.8 C (-27.0 F)
2009-40.0 C (-40.0 F)
2010-37.2 C (-35.0 F)
2011-36.7 C (-34.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Castlewood by year The wettest day of the year at Castlewood, 1893 to 2011. The record is 133.4 mm (5.3 in) in 1966, marked on the chart; the median year is 50.0 mm (2.0 in). 050100150190019201940196019802000Record: 133.4 mm (5.3 in) in 1966
The wettest day of the year at Castlewood, 1893 to 2011. The record is 133.4 mm (5.3 in) in 1966, marked on the chart; the median year is 50.0 mm (2.0 in).
Wettest day (Rx1day) at Castlewood by year
YearWettest day (Rx1day)
189323.4 mm (0.9 in)
189466.8 mm (2.6 in)
189534.3 mm (1.4 in)
189672.6 mm (2.9 in)
189780.0 mm (3.1 in)
189825.4 mm (1.0 in)
190511.9 mm (0.5 in)
190640.9 mm (1.6 in)
190738.1 mm (1.5 in)
190842.4 mm (1.7 in)
190993.0 mm (3.7 in)
191029.0 mm (1.1 in)
191137.6 mm (1.5 in)
191263.0 mm (2.5 in)
191338.4 mm (1.5 in)
191468.3 mm (2.7 in)
191538.9 mm (1.5 in)
191665.3 mm (2.6 in)
191744.7 mm (1.8 in)
191846.7 mm (1.8 in)
191967.3 mm (2.6 in)
192087.1 mm (3.4 in)
192173.7 mm (2.9 in)
192250.8 mm (2.0 in)
192348.0 mm (1.9 in)
192446.5 mm (1.8 in)
192541.7 mm (1.6 in)
192638.1 mm (1.5 in)
192736.6 mm (1.4 in)
192885.6 mm (3.4 in)
192961.7 mm (2.4 in)
193053.8 mm (2.1 in)
1931122.7 mm (4.8 in)
193254.4 mm (2.1 in)
193358.4 mm (2.3 in)
193450.8 mm (2.0 in)
193566.0 mm (2.6 in)
193632.5 mm (1.3 in)
193763.2 mm (2.5 in)
193836.1 mm (1.4 in)
193942.4 mm (1.7 in)
194043.7 mm (1.7 in)
194130.2 mm (1.2 in)
194238.1 mm (1.5 in)
194349.8 mm (2.0 in)
194446.5 mm (1.8 in)
194545.2 mm (1.8 in)
194666.0 mm (2.6 in)
194741.1 mm (1.6 in)
194874.2 mm (2.9 in)
194985.1 mm (3.4 in)
195039.4 mm (1.6 in)
195148.3 mm (1.9 in)
195220.3 mm (0.8 in)
195339.4 mm (1.6 in)
195444.5 mm (1.8 in)
195549.3 mm (1.9 in)
195665.5 mm (2.6 in)
195748.8 mm (1.9 in)
195839.1 mm (1.5 in)
195956.1 mm (2.2 in)
196042.7 mm (1.7 in)
196142.2 mm (1.7 in)
196245.2 mm (1.8 in)
196366.0 mm (2.6 in)
196436.6 mm (1.4 in)
196543.7 mm (1.7 in)
1966133.4 mm (5.3 in)
196730.0 mm (1.2 in)
196841.4 mm (1.6 in)
196938.9 mm (1.5 in)
197033.0 mm (1.3 in)
197153.3 mm (2.1 in)
197274.9 mm (2.9 in)
197323.9 mm (0.9 in)
197426.9 mm (1.1 in)
197557.2 mm (2.3 in)
197633.5 mm (1.3 in)
197764.0 mm (2.5 in)
1978113.3 mm (4.5 in)
197949.5 mm (1.9 in)
198090.9 mm (3.6 in)
198166.5 mm (2.6 in)
198250.0 mm (2.0 in)
198337.6 mm (1.5 in)
198433.3 mm (1.3 in)
198581.8 mm (3.2 in)
198644.7 mm (1.8 in)
198792.7 mm (3.6 in)
198864.5 mm (2.5 in)
198958.2 mm (2.3 in)
1990106.7 mm (4.2 in)
199153.3 mm (2.1 in)
1992112.8 mm (4.4 in)
199343.4 mm (1.7 in)
199479.2 mm (3.1 in)
199563.8 mm (2.5 in)
199644.2 mm (1.7 in)
199783.3 mm (3.3 in)
199858.7 mm (2.3 in)
199967.8 mm (2.7 in)
200050.3 mm (2.0 in)
200199.6 mm (3.9 in)
200268.1 mm (2.7 in)
200330.5 mm (1.2 in)
200458.4 mm (2.3 in)
200566.5 mm (2.6 in)
200653.8 mm (2.1 in)
200750.3 mm (2.0 in)
200851.3 mm (2.0 in)
2009109.2 mm (4.3 in)
201062.2 mm (2.4 in)
201136.1 mm (1.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Castlewood by year The wettest five days of the year at Castlewood, 1893 to 2011. The record is 191.4 mm (7.5 in) in 1992, marked on the chart; the median year is 75.9 mm (3.0 in). 050100150200190019201940196019802000Record: 191.4 mm (7.5 in) in 1992
The wettest five days of the year at Castlewood, 1893 to 2011. The record is 191.4 mm (7.5 in) in 1992, marked on the chart; the median year is 75.9 mm (3.0 in).
Wettest five days (Rx5day) at Castlewood by year
YearWettest five days (Rx5day)
189341.6 mm (1.6 in)
189480.2 mm (3.2 in)
189556.6 mm (2.2 in)
1896109.0 mm (4.3 in)
1897126.2 mm (5.0 in)
189825.4 mm (1.0 in)
190525.4 mm (1.0 in)
190656.2 mm (2.2 in)
190783.0 mm (3.3 in)
190896.6 mm (3.8 in)
1909155.7 mm (6.1 in)
191042.0 mm (1.7 in)
191153.4 mm (2.1 in)
191270.3 mm (2.8 in)
191349.6 mm (2.0 in)
1914139.9 mm (5.5 in)
191558.5 mm (2.3 in)
191687.4 mm (3.4 in)
191765.0 mm (2.6 in)
191866.0 mm (2.6 in)
1919130.8 mm (5.1 in)
1920100.8 mm (4.0 in)
1921110.5 mm (4.4 in)
192259.7 mm (2.4 in)
192378.0 mm (3.1 in)
192466.3 mm (2.6 in)
192572.9 mm (2.9 in)
192650.2 mm (2.0 in)
192766.0 mm (2.6 in)
1928102.3 mm (4.0 in)
192975.2 mm (3.0 in)
193068.8 mm (2.7 in)
1931146.6 mm (5.8 in)
193266.3 mm (2.6 in)
193361.7 mm (2.4 in)
193453.6 mm (2.1 in)
193599.6 mm (3.9 in)
193645.5 mm (1.8 in)
193774.6 mm (2.9 in)
193848.8 mm (1.9 in)
193984.0 mm (3.3 in)
194063.8 mm (2.5 in)
194144.2 mm (1.7 in)
194278.0 mm (3.1 in)
194375.9 mm (3.0 in)
194478.0 mm (3.1 in)
194556.6 mm (2.2 in)
194694.5 mm (3.7 in)
194780.7 mm (3.2 in)
1948112.3 mm (4.4 in)
194996.5 mm (3.8 in)
195058.4 mm (2.3 in)
195167.9 mm (2.7 in)
195250.5 mm (2.0 in)
195381.8 mm (3.2 in)
195461.0 mm (2.4 in)
195572.9 mm (2.9 in)
1956121.7 mm (4.8 in)
195781.5 mm (3.2 in)
195839.1 mm (1.5 in)
195963.0 mm (2.5 in)
196085.3 mm (3.4 in)
196176.5 mm (3.0 in)
196285.4 mm (3.4 in)
1963107.9 mm (4.2 in)
196444.0 mm (1.7 in)
196592.5 mm (3.6 in)
1966156.8 mm (6.2 in)
196790.4 mm (3.6 in)
196872.9 mm (2.9 in)
196962.3 mm (2.5 in)
197058.7 mm (2.3 in)
197178.2 mm (3.1 in)
197277.0 mm (3.0 in)
197332.6 mm (1.3 in)
197454.3 mm (2.1 in)
197559.0 mm (2.3 in)
197635.5 mm (1.4 in)
1977100.8 mm (4.0 in)
1978147.1 mm (5.8 in)
197973.9 mm (2.9 in)
1980152.1 mm (6.0 in)
1981128.9 mm (5.1 in)
198279.7 mm (3.1 in)
198345.5 mm (1.8 in)
198494.3 mm (3.7 in)
198598.3 mm (3.9 in)
198667.7 mm (2.7 in)
198799.6 mm (3.9 in)
198864.5 mm (2.5 in)
198961.2 mm (2.4 in)
1990154.9 mm (6.1 in)
1991108.9 mm (4.3 in)
1992191.4 mm (7.5 in)
199374.2 mm (2.9 in)
199489.1 mm (3.5 in)
199571.4 mm (2.8 in)
199657.4 mm (2.3 in)
1997119.4 mm (4.7 in)
199887.9 mm (3.5 in)
1999102.6 mm (4.0 in)
200062.2 mm (2.4 in)
2001128.8 mm (5.1 in)
200253.3 mm (2.1 in)
200341.4 mm (1.6 in)
200496.0 mm (3.8 in)
200575.9 mm (3.0 in)
200674.9 mm (2.9 in)
200781.3 mm (3.2 in)
200890.9 mm (3.6 in)
2009117.3 mm (4.6 in)
201090.1 mm (3.5 in)
201169.2 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Castlewood by year The longest dry spell of the year at Castlewood, 1893 to 2011. The record is 74 days in 1939, marked on the chart; the median year is 32 days. 020406080190019201940196019802000Record: 74 days in 1939
The longest dry spell of the year at Castlewood, 1893 to 2011. The record is 74 days in 1939, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Castlewood by year
YearLongest dry spell (CDD)
189328 days
189439 days
189525 days
189624 days
189729 days
189838 days
190533 days
190634 days
190732 days
190828 days
190922 days
191041 days
191148 days
191254 days
191368 days
191444 days
191543 days
191673 days
191734 days
191821 days
191928 days
192023 days
192135 days
192228 days
192338 days
192431 days
192529 days
192624 days
192723 days
192831 days
192917 days
193036 days
193142 days
193227 days
193342 days
193455 days
193535 days
193623 days
193729 days
193837 days
193974 days
194033 days
194138 days
194271 days
194354 days
194434 days
194530 days
194629 days
194727 days
194838 days
194959 days
195037 days
195121 days
195256 days
195330 days
195434 days
195542 days
195637 days
195727 days
195824 days
195936 days
196035 days
196135 days
196231 days
196318 days
196438 days
196523 days
196624 days
196725 days
196828 days
196918 days
197036 days
197135 days
197223 days
197339 days
197431 days
197534 days
197633 days
197729 days
197836 days
197925 days
198031 days
198131 days
198246 days
198317 days
198427 days
198522 days
198643 days
198729 days
198828 days
198942 days
199046 days
199141 days
199220 days
199328 days
199435 days
199525 days
199618 days
199725 days
199829 days
199955 days
200024 days
200129 days
200233 days
200332 days
200420 days
200543 days
200653 days
200739 days
200844 days
200928 days
201044 days
201125 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

93 years with a frost

Across 93 years with a frost, the median last spring frost at Castlewood falls on 18 May and the median first autumn frost on 20 September, which leaves a median of 123 days between them.

In 1974 to 2010 the median growing season was 132 days. That is 15 days more than in 1895 to 1935.

Fitted over all years, the growing season changes by +2.4 days per decade at this station.

Frost dates and growing season at Castlewood
MeasureMedian, all yearsEarliest period (1895 to 1935)Recent period (1974 to 2010)Recent against earliestFitted trend
Last spring frost18 May22 May15 May7 days earlier-1.5 days per decade
First autumn frost20 September20 September21 September1 day later+0.9 days per decade
Growing days123 days117 days132 days15 days more+2.4 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

97 years, 1894 to 2010

A day with at least 50.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 140.0 mm (5.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Castlewood: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years50.8 mm (2.0 in)
5 years70.1 mm (2.8 in)
10 years84.5 mm (3.3 in)
25 years104.9 mm (4.1 in)
50 years121.7 mm (4.8 in)
100 years140.0 mm (5.5 in)Longer than the 97 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 97 years of values from 1894 to 2010.

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: 133.4 mm (5.3 in) in 1966; 122.7 mm (4.8 in) in 1931; 113.3 mm (4.5 in) in 1978.

Station Changes

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

Download the Data

  • Data for Castlewood standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Castlewood 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).