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Henshaw Dam Weather Records (USC00043914)

Record envelope, standing records and threshold days for Henshaw Dam (USC00043914), California, United States, with 85 years of record.

Key Facts for Henshaw Dam

  • Henshaw Dam (USC00043914) is a weather station in California, United States at 33.24 latitude and -116.76 longitude, 823 m (2,700 ft) above sea level.
  • The station reports from 1942 to 2026, 85 years of record.
  • 1,464 records set at Henshaw Dam still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Henshaw Dam tied a daily record high minimum temperature of 13.9 C (57.0 F) on 4 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: California, United States, 33.24 latitude, -116.76 longitude.
  • Elevation: 823 m (2,700 ft).
  • Period of record: 1942 to 2026, 85 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

17 days at or beyond a record
Daily record high and record low at Henshaw Dam, with 2026 drawn through them The band shows the record high and record low for each calendar day at Henshaw Dam. The lines show the 2026 daily maximum and minimum. 17 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 Henshaw Dam. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Henshaw Dam, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan31.7 C (89.1 F)-13.3 C (8.1 F)24.4 C (75.9 F)-5.0 C (23.0 F)
Feb30.0 C (86.0 F)-11.1 C (12.0 F)30.0 C (86.0 F)-1.7 C (28.9 F)
Mar35.6 C (96.1 F)-10.6 C (12.9 F)35.6 C (96.1 F)-2.2 C (28.0 F)
Apr33.9 C (93.0 F)-6.1 C (21.0 F)27.2 C (81.0 F)-0.6 C (30.9 F)
May40.0 C (104.0 F)-3.3 C (26.1 F)35.0 C (95.0 F)0.0 C (32.0 F)
Jun42.8 C (109.0 F)-1.7 C (28.9 F)35.6 C (96.1 F)4.4 C (39.9 F)
Jul48.9 C (120.0 F)0.6 C (33.1 F)38.9 C (102.0 F)7.2 C (45.0 F)
Aug45.0 C (113.0 F)-0.6 C (30.9 F)40.0 C (104.0 F)11.1 C (52.0 F)
Sep42.8 C (109.0 F)-3.3 C (26.1 F)36.7 C (98.1 F)5.0 C (41.0 F)
Oct45.0 C (113.0 F)-6.7 C (19.9 F)35.6 C (96.1 F)7.2 C (45.0 F)
Nov33.3 C (91.9 F)-11.7 C (10.9 F)n/an/a
Dec28.9 C (84.0 F)-12.8 C (9.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Henshaw Dam by the year they were set 1,464 records at Henshaw Dam still stand. 2004 holds the most, with 68. 0204060801942: 21943: 451944: 91945: 141946: 151947: 131948: 51949: 271950: 171951: 211952: 181953: 211954: 241955: 101956: 161957: 221958: 161959: 161960: 111961: 191962: 241963: 121964: 151965: 231966: 111967: 131968: 111969: 141970: 221971: 361972: 161973: 181974: 81975: 181976: 111977: 171978: 121979: 121980: 311981: 121982: 81983: 101984: 141985: 201986: 121987: 261988: 91989: 271990: 201991: 111992: 121993: 141994: 71995: 71996: 171997: 101998: 201999: 472000: 122001: 142002: 282003: 242004: 682005: 352006: 302007: 272008: 112009: 202010: 192011: 172012: 112013: 142014: 162015: 182016: 122017: 172018: 112019: 112020: 142021: 122022: 82023: 52024: 92025: 172026: 161942195119601969197819871996200520142023
1,464 records at Henshaw Dam still stand. 2004 holds the most, with 68.
Standing records at Henshaw Dam by the year they were set
Year setStanding records
19422
194345
19449
194514
194615
194713
19485
194927
195017
195121
195218
195321
195424
195510
195616
195722
195816
195916
196011
196119
196224
196312
196415
196523
196611
196713
196811
196914
197022
197136
197216
197318
19748
197518
197611
197717
197812
197912
198031
198112
19828
198310
198414
198520
198612
198726
19889
198927
199020
199111
199212
199314
19947
19957
199617
199710
199820
199947
200012
200114
200228
200324
200468
200535
200630
200727
200811
200920
201019
201117
201211
201314
201416
201518
201612
201717
201811
201911
202014
202112
20228
20235
20249
202517
202616

All-Time Record Progression

4 new records
When Henshaw Dam set new all-time records 4 all-time records were set at Henshaw Dam between 29 July 1980 and 14 January 2007. Each dot is a new record. Record high maximum temperatureRecord low minimum temperatureRecord high minimum temperature29 July 1980: Record high maximum temperature 48.9 C (120.0 F)1 December 2004: Record low minimum temperature -12.8 C (9.0 F)23 July 2006: Record high minimum temperature 25.6 C (78.1 F)14 January 2007: Record low minimum temperature -13.3 C (8.1 F)198019851990199520002005
4 all-time records were set at Henshaw Dam between 29 July 1980 and 14 January 2007. Each dot is a new record.
When Henshaw Dam set new all-time records
DateKindDetail
1980-07-29Record high maximum temperatureRecord high maximum temperature 48.9 C (120.0 F)
2004-12-01Record low minimum temperatureRecord low minimum temperature -12.8 C (9.0 F)
2006-07-23Record high minimum temperatureRecord high minimum temperature 25.6 C (78.1 F)
2007-01-14Record low minimum temperatureRecord low minimum temperature -13.3 C (8.1 F)

Wettest Day of Each Month

Nov: 234.2 mm (9.2 in)
Record daily precipitation for each month at Henshaw Dam The wettest day on record for each calendar month at Henshaw Dam. The most was 234.2 mm (9.2 in) on 23 November 1965. 0100200300 Jan: 160.3 mm (6.3 in), 23 January 1943 Jan Feb: 149.9 mm (5.9 in), 28 February 2017 Feb Mar: 159.8 mm (6.3 in), 1 March 1991 Mar Apr: 68.1 mm (2.7 in), 2 April 1958 Apr May: 55.9 mm (2.2 in), 9 May 1977 May Jun: 23.6 mm (0.9 in), 6 June 1993 Jun Jul: 44.5 mm (1.8 in), 26 July 1976 Jul Aug: 61.0 mm (2.4 in), 9 August 1963 Aug Sep: 86.1 mm (3.4 in), 11 September 1976 Sep Oct: 64.5 mm (2.5 in), 20 October 2004 Oct Nov: 234.2 mm (9.2 in), 23 November 1965 Nov Dec: 157.7 mm (6.2 in), 23 December 1945 Dec
The wettest day on record for each calendar month at Henshaw Dam. The most was 234.2 mm (9.2 in) on 23 November 1965.
Record daily precipitation for each month at Henshaw Dam
MonthRecord daily precipitation (mm)Date
Jan160.3 mm (6.3 in)23 January 1943
Feb149.9 mm (5.9 in)28 February 2017
Mar159.8 mm (6.3 in)1 March 1991
Apr68.1 mm (2.7 in)2 April 1958
May55.9 mm (2.2 in)9 May 1977
Jun23.6 mm (0.9 in)6 June 1993
Jul44.5 mm (1.8 in)26 July 1976
Aug61.0 mm (2.4 in)9 August 1963
Sep86.1 mm (3.4 in)11 September 1976
Oct64.5 mm (2.5 in)20 October 2004
Nov234.2 mm (9.2 in)23 November 1965
Dec157.7 mm (6.2 in)23 December 1945

Period of Record Coverage

1942 to 2026
Days with data per year at Henshaw Dam 85 years of record at Henshaw Dam, 1942 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1942, 1955, 1977, 1978, 1979, 2026. 1942: 119 of 365 days1943: 365 of 365 days1944: 366 of 366 days1945: 354 of 365 days1946: 364 of 365 days1947: 365 of 365 days1948: 366 of 366 days1949: 363 of 365 days1950: 363 of 365 days1951: 360 of 365 days1952: 365 of 366 days1953: 364 of 365 days1954: 364 of 365 days1955: 315 of 365 days1956: 365 of 366 days1957: 364 of 365 days1958: 365 of 365 days1959: 364 of 365 days1960: 365 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 364 of 365 days1964: 366 of 366 days1965: 364 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 364 of 365 days1972: 366 of 366 days1973: 363 of 365 days1974: 364 of 365 days1975: 334 of 365 days1976: 335 of 366 days1977: 302 of 365 days1978: 242 of 365 days1979: 301 of 365 days1980: 331 of 366 days1981: 365 of 365 days1982: 359 of 365 days1983: 338 of 365 days1984: 334 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 365 of 366 days1989: 365 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 335 of 366 days1993: 365 of 365 days1994: 365 of 365 days1995: 365 of 365 days1996: 366 of 366 days1997: 334 of 365 days1998: 335 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 333 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: 362 of 365 days2011: 360 of 365 days2012: 356 of 366 days2013: 363 of 365 days2014: 365 of 365 days2015: 360 of 365 days2016: 364 of 366 days2017: 356 of 365 days2018: 361 of 365 days2019: 350 of 365 days2020: 353 of 366 days2021: 341 of 365 days2022: 350 of 365 days2023: 350 of 365 days2024: 362 of 366 days2025: 353 of 365 days2026: 281 of 365 days195019651980199520102025
85 years of record at Henshaw Dam, 1942 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1942, 1955, 1977, 1978, 1979, 2026.
Days with data per year at Henshaw Dam
YearDays with dataShare of yearComplete
194211933%No
1943365100%Yes
1944366100%Yes
194535497%Yes
1946364100%Yes
1947365100%Yes
1948366100%Yes
194936399%Yes
195036399%Yes
195136099%Yes
1952365100%Yes
1953364100%Yes
1954364100%Yes
195531586%No
1956365100%Yes
1957364100%Yes
1958365100%Yes
1959364100%Yes
1960365100%Yes
1961365100%Yes
1962365100%Yes
1963364100%Yes
1964366100%Yes
1965364100%Yes
1966365100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971364100%Yes
1972366100%Yes
197336399%Yes
1974364100%Yes
197533492%Yes
197633592%Yes
197730283%No
197824266%No
197930182%No
198033190%Yes
1981365100%Yes
198235998%Yes
198333893%Yes
198433491%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
1988365100%Yes
1989365100%Yes
1990365100%Yes
1991365100%Yes
199233592%Yes
1993365100%Yes
1994365100%Yes
1995365100%Yes
1996366100%Yes
199733492%Yes
199833592%Yes
1999365100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
200333391%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
201036299%Yes
201136099%Yes
201235697%Yes
201336399%Yes
2014365100%Yes
201536099%Yes
201636499%Yes
201735698%Yes
201836199%Yes
201935096%Yes
202035396%Yes
202134193%Yes
202235096%Yes
202335096%Yes
202436299%Yes
202535397%Yes
202628177%No

Latest Records

20
Latest records at Henshaw Dam
DateStationRecordValueBeat old record byOld record stoodSignificance
4 October 2026Henshaw Dam, USdaily high min (Tie, Provisional)13.9 C (57.0 F)tie83 years8 of 100 (Routine)
28 September 2026Henshaw Dam, USdaily high min (Tie, Provisional)16.1 C (61.0 F)tie80 years8 of 100 (Routine)
28 August 2026Henshaw Dam, USdaily high min (Tie, Provisional)17.2 C (63.0 F)tie83 years8 of 100 (Routine)
27 August 2026Henshaw Dam, USdaily high min (Provisional)17.8 C (64.0 F)0.6 C (1.1 F)68 years29 of 100 (Routine)
24 August 2026Henshaw Dam, USdaily high max (Provisional)39.4 C (102.9 F)0.5 C (0.9 F)69 years29 of 100 (Routine)
1 August 2026Henshaw Dam, USdaily high max (Tie)40.0 C (104.0 F)tie53 years6 of 100 (Routine)
29 June 2026Henshaw Dam, USdaily low max (Tie)22.8 C (73.0 F)tie73 years7 of 100 (Routine)
13 June 2026Henshaw Dam, USdaily high max (Tie)35.6 C (96.1 F)tie69 years7 of 100 (Routine)
1 April 2026Henshaw Dam, USdaily high min (Tie)8.9 C (48.0 F)tie40 years5 of 100 (Routine)
30 March 2026Henshaw Dam, USdaily high max31.1 C (88.0 F)1.1 C (2.0 F)55 years26 of 100 (Routine)
29 March 2026Henshaw Dam, USdaily high max31.1 C (88.0 F)1.7 C (3.1 F)11 years14 of 100 (Routine)
28 March 2026Henshaw Dam, USdaily high max31.1 C (88.0 F)0.5 C (0.9 F)11 years11 of 100 (Routine)
26 March 2026Henshaw Dam, USdaily high max (Tie)30.0 C (86.0 F)tie4 years2 of 100 (Routine)
25 March 2026Henshaw Dam, USdaily high max30.6 C (87.1 F)2.3 C (4.1 F)0 years12 of 100 (Routine)
24 March 2026Henshaw Dam, USdaily high max31.1 C (88.0 F)3.3 C (5.9 F)36 years24 of 100 (Routine)
21 March 2026Henshaw Dam, USmonthly high max35.6 C (96.1 F)1.2 C (2.2 F)0 years20 of 100 (Routine)
20 March 2026Henshaw Dam, USmonthly high max (Tie)34.4 C (93.9 F)tie0 years4 of 100 (Routine)
19 March 2026Henshaw Dam, USmonthly high max34.4 C (93.9 F)2.2 C (4.0 F)28 years30 of 100 (Routine)
18 March 2026Henshaw Dam, USmonthly high max (Tie)32.2 C (90.0 F)tie28 years6 of 100 (Routine)
14 March 2026Henshaw Dam, USdaily high max29.4 C (84.9 F)0.5 C (0.9 F)8 years10 of 100 (Routine)

Climate Trend

69 complete years, 1943 to 2025
Annual mean temperature at Henshaw Dam as warming stripes, 1943 to 2025 One stripe for each of 69 complete years at Henshaw Dam, 1943 to 2025. Blue stripes are years cooler than the station's own mean of 14.0 C (57.2 F); red stripes are warmer. The coolest year was 2004, at 12.3 C (54.1 F), and the warmest was 2017, at 15.4 C (59.7 F). The strongest colour marks a difference of 1.8 C (3.2 F). 1943: 15.4 C, +1.4 C from the station mean1944: 13.7 C, -0.3 C from the station mean1945: 14.3 C, +0.3 C from the station mean1946: 14.3 C, +0.2 C from the station mean1947: 14.3 C, +0.3 C from the station mean1948: 13.5 C, -0.5 C from the station mean1949: 13.3 C, -0.7 C from the station mean1950: 14.0 C, 0.0 C from the station mean1951: 13.6 C, -0.4 C from the station mean1952: 13.8 C, -0.2 C from the station mean1953: 13.4 C, -0.7 C from the station mean1954: 14.0 C, 0.0 C from the station mean1956: 13.3 C, -0.7 C from the station mean1957: 13.9 C, -0.2 C from the station mean1958: 14.5 C, +0.5 C from the station mean1959: 14.9 C, +0.9 C from the station mean1960: 13.8 C, -0.2 C from the station mean1961: 13.8 C, -0.2 C from the station mean1962: 13.5 C, -0.6 C from the station mean1963: 13.6 C, -0.5 C from the station mean1964: 13.1 C, -0.9 C from the station mean1965: 13.1 C, -0.9 C from the station mean1966: 14.2 C, +0.2 C from the station mean1967: 14.2 C, +0.1 C from the station mean1968: 13.7 C, -0.3 C from the station mean1969: 14.1 C, +0.1 C from the station mean1970: 14.3 C, +0.3 C from the station mean1971: 13.7 C, -0.3 C from the station mean1972: 14.0 C, 0.0 C from the station mean1973: 13.1 C, -0.9 C from the station mean1974: 13.9 C, -0.2 C from the station mean1982: 13.1 C, -0.9 C from the station mean1985: 13.1 C, -0.9 C from the station mean1986: 13.5 C, -0.5 C from the station mean1987: 12.8 C, -1.2 C from the station mean1988: 14.1 C, +0.1 C from the station mean1989: 14.1 C, +0.1 C from the station mean1990: 14.2 C, +0.2 C from the station mean1991: 14.3 C, +0.3 C from the station mean1993: 14.3 C, +0.3 C from the station mean1994: 14.2 C, +0.2 C from the station mean1995: 14.9 C, +0.9 C from the station mean1996: 15.2 C, +1.2 C from the station mean1999: 12.9 C, -1.1 C from the station mean2000: 14.6 C, +0.5 C from the station mean2001: 14.3 C, +0.3 C from the station mean2002: 13.4 C, -0.6 C from the station mean2004: 12.3 C, -1.7 C from the station mean2005: 13.1 C, -0.9 C from the station mean2006: 14.7 C, +0.7 C from the station mean2007: 14.8 C, +0.8 C from the station mean2008: 14.5 C, +0.5 C from the station mean2009: 13.6 C, -0.4 C from the station mean2010: 12.7 C, -1.3 C from the station mean2011: 12.8 C, -1.3 C from the station mean2012: 14.4 C, +0.3 C from the station mean2013: 14.0 C, 0.0 C from the station mean2014: 15.3 C, +1.3 C from the station mean2015: 15.1 C, +1.1 C from the station mean2016: 15.0 C, +1.0 C from the station mean2017: 15.4 C, +1.4 C from the station mean2018: 15.1 C, +1.1 C from the station mean2019: 13.8 C, -0.3 C from the station mean2020: 14.8 C, +0.8 C from the station mean2021: 14.9 C, +0.8 C from the station mean2022: 14.9 C, +0.9 C from the station mean2023: 13.8 C, -0.2 C from the station mean2024: 14.7 C, +0.7 C from the station mean2025: 14.8 C, +0.8 C from the station mean194319501960197019801990200020102020
One stripe for each of 69 complete years at Henshaw Dam, 1943 to 2025. Blue stripes are years cooler than the station's own mean of 14.0 C (57.2 F); red stripes are warmer. The coolest year was 2004, at 12.3 C (54.1 F), and the warmest was 2017, at 15.4 C (59.7 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Henshaw Dam as warming stripes, 1943 to 2025
YearAnnual mean temperatureDifference from the station mean
194315.4 C+1.35 C
194413.7 C-0.30 C
194514.3 C+0.30 C
194614.3 C+0.23 C
194714.3 C+0.32 C
194813.5 C-0.50 C
194913.3 C-0.74 C
195014.0 C+0.01 C
195113.6 C-0.38 C
195213.8 C-0.23 C
195313.4 C-0.66 C
195414.0 C+0.00 C
195613.3 C-0.70 C
195713.9 C-0.17 C
195814.5 C+0.49 C
195914.9 C+0.85 C
196013.8 C-0.21 C
196113.8 C-0.21 C
196213.5 C-0.56 C
196313.6 C-0.47 C
196413.1 C-0.90 C
196513.1 C-0.90 C
196614.2 C+0.16 C
196714.2 C+0.14 C
196813.7 C-0.34 C
196914.1 C+0.05 C
197014.3 C+0.30 C
197113.7 C-0.33 C
197214.0 C+0.00 C
197313.1 C-0.94 C
197413.9 C-0.16 C
198213.1 C-0.93 C
198513.1 C-0.92 C
198613.5 C-0.51 C
198712.8 C-1.25 C
198814.1 C+0.08 C
198914.1 C+0.10 C
199014.2 C+0.19 C
199114.3 C+0.31 C
199314.3 C+0.27 C
199414.2 C+0.16 C
199514.9 C+0.92 C
199615.2 C+1.21 C
199912.9 C-1.08 C
200014.6 C+0.54 C
200114.3 C+0.26 C
200213.4 C-0.64 C
200412.3 C-1.72 C
200513.1 C-0.90 C
200614.7 C+0.65 C
200714.8 C+0.76 C
200814.5 C+0.45 C
200913.6 C-0.41 C
201012.7 C-1.34 C
201112.8 C-1.27 C
201214.4 C+0.33 C
201314.0 C-0.05 C
201415.3 C+1.25 C
201515.1 C+1.10 C
201615.0 C+0.96 C
201715.4 C+1.39 C
201815.1 C+1.05 C
201913.8 C-0.26 C
202014.8 C+0.77 C
202114.9 C+0.83 C
202214.9 C+0.91 C
202313.8 C-0.24 C
202414.7 C+0.72 C
202514.8 C+0.75 C

The annual mean temperature here has risen by 0.07 C (0.01 to 0.14) per decade over 1943 to 2025. In Fahrenheit: 0.13 F (0.01 to 0.25) per decade. The slope is a straight line fitted to 69 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Henshaw Dam
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.07 C (0.01 to 0.14) per decade0.13 F (0.01 to 0.25) per decade1943 to 202569Rise
Mean daily maximum0.2 C (0.1 to 0.3) per decade0.4 F (0.3 to 0.5) per decade1943 to 202569Rise
Mean daily minimum-0.08 C (-0.19 to 0.03) per decade-0.1 F (-0.3 to 0.1) per decade1943 to 202569Not 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

1942 to 2026
Yearly extremes at Henshaw Dam: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)48.9 C (120.0 F)198040.0 C (104.0 F)85
Coldest night (TNn)-13.3 C (8.1 F)2007-7.8 C (18.0 F)85
Wettest day (Rx1day)234.2 mm (9.2 in)196576.2 mm (3.0 in)85
Wettest five days (Rx5day)374.7 mm (14.8 in)1980127.8 mm (5.0 in)85
Longest dry spell (CDD)202 days198081 days85

Hottest day (TXx)

Hottest day (TXx) at Henshaw Dam by year The hottest day of the year at Henshaw Dam, 1942 to 2026. The record is 48.9 C (120.0 F) in 1980, marked on the chart; the median year is 40.0 C (104.0 F). 354045501960198020002020Record: 48.9 C (120.0 F) in 1980
The hottest day of the year at Henshaw Dam, 1942 to 2026. The record is 48.9 C (120.0 F) in 1980, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at Henshaw Dam by year
YearHottest day (TXx)
194236.7 C (98.1 F)
194340.0 C (104.0 F)
194440.6 C (105.1 F)
194538.9 C (102.0 F)
194638.9 C (102.0 F)
194740.6 C (105.1 F)
194841.1 C (106.0 F)
194939.4 C (102.9 F)
195042.8 C (109.0 F)
195139.4 C (102.9 F)
195238.3 C (100.9 F)
195338.9 C (102.0 F)
195439.4 C (102.9 F)
195541.7 C (107.1 F)
195638.9 C (102.0 F)
195739.4 C (102.9 F)
195840.0 C (104.0 F)
195938.9 C (102.0 F)
196043.3 C (109.9 F)
196141.7 C (107.1 F)
196240.6 C (105.1 F)
196339.4 C (102.9 F)
196439.4 C (102.9 F)
196538.3 C (100.9 F)
196640.0 C (104.0 F)
196740.0 C (104.0 F)
196837.8 C (100.0 F)
196940.0 C (104.0 F)
197041.7 C (107.1 F)
197142.8 C (109.0 F)
197243.3 C (109.9 F)
197340.6 C (105.1 F)
197438.9 C (102.0 F)
197540.0 C (104.0 F)
197639.4 C (102.9 F)
197738.9 C (102.0 F)
197841.1 C (106.0 F)
197940.6 C (105.1 F)
198048.9 C (120.0 F)
198139.4 C (102.9 F)
198239.4 C (102.9 F)
198338.9 C (102.0 F)
198440.0 C (104.0 F)
198541.1 C (106.0 F)
198636.7 C (98.1 F)
198737.2 C (99.0 F)
198838.9 C (102.0 F)
198942.2 C (108.0 F)
199041.7 C (107.1 F)
199138.9 C (102.0 F)
199238.9 C (102.0 F)
199340.0 C (104.0 F)
199441.7 C (107.1 F)
199542.2 C (108.0 F)
199640.6 C (105.1 F)
199742.2 C (108.0 F)
199842.2 C (108.0 F)
199940.6 C (105.1 F)
200041.7 C (107.1 F)
200140.0 C (104.0 F)
200241.7 C (107.1 F)
200340.6 C (105.1 F)
200441.1 C (106.0 F)
200539.4 C (102.9 F)
200643.3 C (109.9 F)
200742.2 C (108.0 F)
200838.9 C (102.0 F)
200941.1 C (106.0 F)
201040.6 C (105.1 F)
201140.0 C (104.0 F)
201239.4 C (102.9 F)
201341.7 C (107.1 F)
201441.1 C (106.0 F)
201540.6 C (105.1 F)
201642.8 C (109.0 F)
201741.1 C (106.0 F)
201841.1 C (106.0 F)
201938.9 C (102.0 F)
202042.8 C (109.0 F)
202141.1 C (106.0 F)
202240.6 C (105.1 F)
202339.4 C (102.9 F)
202441.7 C (107.1 F)
202540.0 C (104.0 F)
202640.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Henshaw Dam by year The coldest night of the year at Henshaw Dam, 1942 to 2026. The record is -13.3 C (8.1 F) in 2007, marked on the chart; the median year is -7.8 C (18.0 F). -15-10-501960198020002020Record: -13.3 C (8.1 F) in 2007
The coldest night of the year at Henshaw Dam, 1942 to 2026. The record is -13.3 C (8.1 F) in 2007, marked on the chart; the median year is -7.8 C (18.0 F).
Coldest night (TNn) at Henshaw Dam by year
YearColdest night (TNn)
1942-6.7 C (19.9 F)
1943-2.8 C (27.0 F)
1944-2.8 C (27.0 F)
1945-3.3 C (26.1 F)
1946-6.7 C (19.9 F)
1947-6.7 C (19.9 F)
1948-6.7 C (19.9 F)
1949-8.9 C (16.0 F)
1950-8.3 C (17.1 F)
1951-9.4 C (15.1 F)
1952-6.7 C (19.9 F)
1953-9.4 C (15.1 F)
1954-10.6 C (12.9 F)
1955-7.2 C (19.0 F)
1956-8.3 C (17.1 F)
1957-6.7 C (19.9 F)
1958-8.3 C (17.1 F)
1959-5.6 C (21.9 F)
1960-7.8 C (18.0 F)
1961-8.9 C (16.0 F)
1962-9.4 C (15.1 F)
1963-11.7 C (10.9 F)
1964-8.3 C (17.1 F)
1965-8.3 C (17.1 F)
1966-10.6 C (12.9 F)
1967-9.4 C (15.1 F)
1968-12.2 C (10.0 F)
1969-9.4 C (15.1 F)
1970-8.9 C (16.0 F)
1971-7.2 C (19.0 F)
1972-7.8 C (18.0 F)
1973-11.7 C (10.9 F)
1974-10.0 C (14.0 F)
1975-9.4 C (15.1 F)
1976-11.1 C (12.0 F)
1977-7.2 C (19.0 F)
1978-10.0 C (14.0 F)
1979-11.7 C (10.9 F)
1980-6.1 C (21.0 F)
1981-7.8 C (18.0 F)
1982-7.8 C (18.0 F)
1983-6.1 C (21.0 F)
1984-5.6 C (21.9 F)
1985-6.7 C (19.9 F)
1986-5.6 C (21.9 F)
1987-10.0 C (14.0 F)
1988-7.8 C (18.0 F)
1989-9.4 C (15.1 F)
1990-10.0 C (14.0 F)
1991-7.2 C (19.0 F)
1992-5.6 C (21.9 F)
1993-6.1 C (21.0 F)
1994-6.7 C (19.9 F)
1995-3.9 C (25.0 F)
1996-5.0 C (23.0 F)
1997-7.8 C (18.0 F)
1998-12.2 C (10.0 F)
1999-11.1 C (12.0 F)
2000-7.2 C (19.0 F)
2001-6.7 C (19.9 F)
2002-11.1 C (12.0 F)
2003-10.6 C (12.9 F)
2004-12.8 C (9.0 F)
2005-8.3 C (17.1 F)
2006-8.9 C (16.0 F)
2007-13.3 C (8.1 F)
2008-8.3 C (17.1 F)
2009-8.3 C (17.1 F)
2010-9.4 C (15.1 F)
2011-10.6 C (12.9 F)
2012-6.7 C (19.9 F)
2013-8.9 C (16.0 F)
2014-6.7 C (19.9 F)
2015-8.3 C (17.1 F)
2016-5.6 C (21.9 F)
2017-6.1 C (21.0 F)
2018-7.2 C (19.0 F)
2019-5.6 C (21.9 F)
2020-7.2 C (19.0 F)
2021-6.7 C (19.9 F)
2022-6.7 C (19.9 F)
2023-6.7 C (19.9 F)
2024-7.2 C (19.0 F)
2025-6.1 C (21.0 F)
2026-5.0 C (23.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Henshaw Dam by year The wettest day of the year at Henshaw Dam, 1942 to 2026. The record is 234.2 mm (9.2 in) in 1965, marked on the chart; the median year is 76.2 mm (3.0 in). 01002003001960198020002020Record: 234.2 mm (9.2 in) in 1965
The wettest day of the year at Henshaw Dam, 1942 to 2026. The record is 234.2 mm (9.2 in) in 1965, marked on the chart; the median year is 76.2 mm (3.0 in).
Wettest day (Rx1day) at Henshaw Dam by year
YearWettest day (Rx1day)
194257.2 mm (2.3 in)
1943160.3 mm (6.3 in)
194498.6 mm (3.9 in)
1945157.7 mm (6.2 in)
194660.7 mm (2.4 in)
194767.8 mm (2.7 in)
194873.7 mm (2.9 in)
194939.6 mm (1.6 in)
195038.1 mm (1.5 in)
1951101.6 mm (4.0 in)
195281.3 mm (3.2 in)
195330.5 mm (1.2 in)
195481.3 mm (3.2 in)
195550.0 mm (2.0 in)
195682.8 mm (3.3 in)
195756.4 mm (2.2 in)
195875.7 mm (3.0 in)
195970.1 mm (2.8 in)
196041.1 mm (1.6 in)
196139.1 mm (1.5 in)
196288.9 mm (3.5 in)
196376.2 mm (3.0 in)
196466.0 mm (2.6 in)
1965234.2 mm (9.2 in)
1966112.0 mm (4.4 in)
196780.5 mm (3.2 in)
196842.4 mm (1.7 in)
1969130.6 mm (5.1 in)
197098.8 mm (3.9 in)
197163.5 mm (2.5 in)
197253.3 mm (2.1 in)
197342.4 mm (1.7 in)
197484.3 mm (3.3 in)
197576.2 mm (3.0 in)
197686.1 mm (3.4 in)
197757.2 mm (2.3 in)
197886.4 mm (3.4 in)
197989.4 mm (3.5 in)
1980142.2 mm (5.6 in)
198158.4 mm (2.3 in)
1982110.5 mm (4.4 in)
198363.5 mm (2.5 in)
198465.3 mm (2.6 in)
198573.7 mm (2.9 in)
1986101.6 mm (4.0 in)
198764.0 mm (2.5 in)
1988119.6 mm (4.7 in)
198949.0 mm (1.9 in)
199049.0 mm (1.9 in)
1991159.8 mm (6.3 in)
199268.1 mm (2.7 in)
1993131.3 mm (5.2 in)
199489.2 mm (3.5 in)
1995140.7 mm (5.5 in)
199678.7 mm (3.1 in)
199796.3 mm (3.8 in)
199890.2 mm (3.6 in)
199923.9 mm (0.9 in)
200050.8 mm (2.0 in)
200140.1 mm (1.6 in)
200257.2 mm (2.3 in)
200371.6 mm (2.8 in)
2004101.1 mm (4.0 in)
200574.4 mm (2.9 in)
200669.6 mm (2.7 in)
2007103.6 mm (4.1 in)
200889.7 mm (3.5 in)
200981.8 mm (3.2 in)
2010128.3 mm (5.1 in)
201179.2 mm (3.1 in)
201268.1 mm (2.7 in)
201333.3 mm (1.3 in)
201491.2 mm (3.6 in)
201540.1 mm (1.6 in)
201672.9 mm (2.9 in)
2017149.9 mm (5.9 in)
201871.1 mm (2.8 in)
2019104.1 mm (4.1 in)
202048.8 mm (1.9 in)
202152.6 mm (2.1 in)
202287.1 mm (3.4 in)
202390.9 mm (3.6 in)
202480.0 mm (3.1 in)
202589.9 mm (3.5 in)
202654.6 mm (2.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Henshaw Dam by year The wettest five days of the year at Henshaw Dam, 1942 to 2026. The record is 374.7 mm (14.8 in) in 1980, marked on the chart; the median year is 127.8 mm (5.0 in). 01002003004001960198020002020Record: 374.7 mm (14.8 in) in 1980
The wettest five days of the year at Henshaw Dam, 1942 to 2026. The record is 374.7 mm (14.8 in) in 1980, marked on the chart; the median year is 127.8 mm (5.0 in).
Wettest five days (Rx5day) at Henshaw Dam by year
YearWettest five days (Rx5day)
194261.0 mm (2.4 in)
1943291.1 mm (11.5 in)
1944147.3 mm (5.8 in)
1945237.8 mm (9.4 in)
194691.3 mm (3.6 in)
194797.3 mm (3.8 in)
194888.7 mm (3.5 in)
194981.6 mm (3.2 in)
195058.5 mm (2.3 in)
1951162.5 mm (6.4 in)
1952162.5 mm (6.4 in)
195341.4 mm (1.6 in)
1954186.2 mm (7.3 in)
195588.1 mm (3.5 in)
1956111.8 mm (4.4 in)
1957106.0 mm (4.2 in)
1958161.9 mm (6.4 in)
1959113.1 mm (4.5 in)
196094.0 mm (3.7 in)
196145.7 mm (1.8 in)
1962112.8 mm (4.4 in)
1963147.4 mm (5.8 in)
1964118.8 mm (4.7 in)
1965285.1 mm (11.2 in)
1966338.4 mm (13.3 in)
1967111.5 mm (4.4 in)
196866.0 mm (2.6 in)
1969267.5 mm (10.5 in)
1970201.4 mm (7.9 in)
1971170.7 mm (6.7 in)
1972108.1 mm (4.3 in)
1973103.4 mm (4.1 in)
1974199.4 mm (7.9 in)
1975115.6 mm (4.6 in)
1976198.1 mm (7.8 in)
1977109.3 mm (4.3 in)
1978287.8 mm (11.3 in)
1979130.1 mm (5.1 in)
1980374.7 mm (14.8 in)
1981123.7 mm (4.9 in)
1982172.5 mm (6.8 in)
1983204.5 mm (8.1 in)
1984127.8 mm (5.0 in)
1985106.5 mm (4.2 in)
1986136.3 mm (5.4 in)
1987100.1 mm (3.9 in)
1988131.0 mm (5.2 in)
198953.1 mm (2.1 in)
199098.2 mm (3.9 in)
1991326.4 mm (12.9 in)
1992104.9 mm (4.1 in)
1993319.5 mm (12.6 in)
1994154.0 mm (6.1 in)
1995204.6 mm (8.1 in)
199692.2 mm (3.6 in)
1997147.6 mm (5.8 in)
1998154.8 mm (6.1 in)
199942.9 mm (1.7 in)
2000120.1 mm (4.7 in)
200181.2 mm (3.2 in)
2002113.6 mm (4.5 in)
2003104.3 mm (4.1 in)
2004203.4 mm (8.0 in)
2005213.6 mm (8.4 in)
2006104.9 mm (4.1 in)
2007118.0 mm (4.6 in)
2008197.3 mm (7.8 in)
2009135.9 mm (5.4 in)
2010304.5 mm (12.0 in)
2011130.8 mm (5.1 in)
201299.0 mm (3.9 in)
201352.6 mm (2.1 in)
2014133.1 mm (5.2 in)
201564.3 mm (2.5 in)
2016144.5 mm (5.7 in)
2017226.6 mm (8.9 in)
2018122.4 mm (4.8 in)
2019232.6 mm (9.2 in)
2020143.5 mm (5.6 in)
2021112.2 mm (4.4 in)
2022101.6 mm (4.0 in)
2023200.5 mm (7.9 in)
2024171.3 mm (6.7 in)
2025113.0 mm (4.4 in)
2026142.0 mm (5.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Henshaw Dam by year The longest dry spell of the year at Henshaw Dam, 1942 to 2026. The record is 202 days in 1980, marked on the chart; the median year is 81 days. 0501001502002501960198020002020Record: 202 days in 1980
The longest dry spell of the year at Henshaw Dam, 1942 to 2026. The record is 202 days in 1980, marked on the chart; the median year is 81 days.
Longest dry spell (CDD) at Henshaw Dam by year
YearLongest dry spell (CDD)
194241 days
194397 days
1944155 days
1945112 days
194667 days
194761 days
1948137 days
1949128 days
195067 days
195167 days
195289 days
195382 days
195470 days
195581 days
1956132 days
1957123 days
195895 days
195995 days
196078 days
196195 days
1962110 days
1963102 days
1964108 days
196566 days
196686 days
196752 days
196856 days
1969147 days
1970105 days
197167 days
197266 days
1973167 days
197464 days
197576 days
197637 days
197782 days
197841 days
197991 days
1980202 days
198180 days
198271 days
198395 days
198476 days
198560 days
198698 days
198760 days
198861 days
1989127 days
199055 days
199160 days
199269 days
1993127 days
199487 days
199558 days
1996101 days
199753 days
199852 days
199970 days
2000124 days
2001183 days
2002132 days
200358 days
2004115 days
200579 days
200675 days
2007124 days
200898 days
2009140 days
201076 days
201136 days
201265 days
201374 days
201497 days
201538 days
2016135 days
2017113 days
201883 days
201962 days
2020141 days
202169 days
2022113 days
202357 days
2024157 days
202562 days
202672 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

69 years with a frost

Across 69 years with a frost, the median last spring frost at Henshaw Dam falls on 24 April and the median first autumn frost on 26 October, which leaves a median of 180 days between them.

In 1993 to 2025 the median growing season was 176 days. That is 11 days fewer than in 1943 to 1973.

Fitted over all years, the growing season changes by -4.2 days per decade at this station.

Frost dates and growing season at Henshaw Dam
MeasureMedian, all yearsEarliest period (1943 to 1973)Recent period (1993 to 2025)Recent against earliestFitted trend
Last spring frost24 April24 April22 April2 days earlier+2.8 days per decade
First autumn frost26 October30 October23 October7 days earlier-1.4 days per decade
Growing days180 days187 days176 days11 days fewer-4.2 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

81 years, 1943 to 2025

A day with at least 75.6 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 195.7 mm (7.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Henshaw Dam: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years75.6 mm (3.0 in)
5 years106.4 mm (4.2 in)
10 years127.4 mm (5.0 in)
25 years154.4 mm (6.1 in)
50 years174.9 mm (6.9 in)
100 years195.7 mm (7.7 in)Longer than the 81 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, 81 years of values from 1943 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: 234.2 mm (9.2 in) in 1965; 160.3 mm (6.3 in) in 1943; 159.8 mm (6.3 in) in 1991.

Station Changes

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

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Henshaw Dam had a mean temperature of 14.6 C (58.2 F) and 568.3 mm (22.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Mt Diablo Junction (United States, 696 km away), Cap Cepet (France, 9,725 km away) and Girona/Costa Brava (Spain, 9,629 km away).

Climate twins of Henshaw Dam: 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
Mt Diablo JunctionUnited States696 km (432 mi)14.9 C (58.9 F)596.5 mm (23.5 in)0.71
Cap CepetFrance9,725 km (6,043 mi)14.7 C (58.5 F)678.8 mm (26.7 in)0.83
Girona/Costa BravaSpain9,629 km (5,983 mi)14.1 C (57.4 F)714.2 mm (28.1 in)0.87

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