Twitchell Dam Weather Records (USC00049111)
Record envelope, standing records and threshold days for Twitchell Dam (USC00049111), California, United States, with 65 years of record.
Key Facts for Twitchell Dam
- Twitchell Dam (USC00049111) is a weather station in California, United States at 34.99 latitude and -120.32 longitude, 177 m (582 ft) above sea level.
- The station reports from 1962 to 2026, 65 years of record.
- 1,464 records set at Twitchell Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Twitchell Dam set a daily record high maximum temperature of 39.4 C (102.9 F) on 10 September 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, 34.99 latitude, -120.32 longitude.
- Elevation: 177 m (582 ft).
- Period of record: 1962 to 2026, 65 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
24 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 34.4 C (93.9 F) | -8.3 C (17.1 F) | 30.0 C (86.0 F) | 2.2 C (36.0 F) |
| Feb | 32.2 C (90.0 F) | -7.2 C (19.0 F) | 31.1 C (88.0 F) | 1.7 C (35.1 F) |
| Mar | 36.7 C (98.1 F) | -3.3 C (26.1 F) | 36.7 C (98.1 F) | 6.1 C (43.0 F) |
| Apr | 42.2 C (108.0 F) | -1.7 C (28.9 F) | 32.2 C (90.0 F) | 1.7 C (35.1 F) |
| May | 40.0 C (104.0 F) | -1.7 C (28.9 F) | 31.7 C (89.1 F) | 3.3 C (37.9 F) |
| Jun | 44.4 C (111.9 F) | 1.7 C (35.1 F) | 37.2 C (99.0 F) | 5.0 C (41.0 F) |
| Jul | 43.9 C (111.0 F) | 2.2 C (36.0 F) | 35.6 C (96.1 F) | 5.6 C (42.1 F) |
| Aug | 42.8 C (109.0 F) | 3.9 C (39.0 F) | 41.1 C (106.0 F) | 7.8 C (46.0 F) |
| Sep | 46.1 C (115.0 F) | 0.6 C (33.1 F) | 41.7 C (107.1 F) | 6.7 C (44.1 F) |
| Oct | 41.7 C (107.1 F) | -3.3 C (26.1 F) | 38.9 C (102.0 F) | 7.2 C (45.0 F) |
| Nov | 36.7 C (98.1 F) | -7.2 C (19.0 F) | n/a | n/a |
| Dec | 30.6 C (87.1 F) | -7.8 C (18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1962 | 25 |
| 1963 | 31 |
| 1964 | 45 |
| 1965 | 43 |
| 1966 | 24 |
| 1967 | 18 |
| 1968 | 20 |
| 1969 | 18 |
| 1970 | 11 |
| 1971 | 38 |
| 1972 | 16 |
| 1973 | 12 |
| 1974 | 19 |
| 1975 | 19 |
| 1976 | 30 |
| 1977 | 43 |
| 1978 | 19 |
| 1979 | 26 |
| 1980 | 31 |
| 1981 | 24 |
| 1982 | 15 |
| 1983 | 22 |
| 1984 | 29 |
| 1985 | 29 |
| 1986 | 23 |
| 1987 | 37 |
| 1988 | 26 |
| 1989 | 25 |
| 1990 | 29 |
| 1991 | 9 |
| 1992 | 3 |
| 1993 | 22 |
| 1994 | 9 |
| 2001 | 9 |
| 2002 | 28 |
| 2003 | 21 |
| 2004 | 17 |
| 2005 | 9 |
| 2006 | 29 |
| 2007 | 24 |
| 2008 | 21 |
| 2009 | 31 |
| 2010 | 14 |
| 2011 | 23 |
| 2012 | 25 |
| 2013 | 39 |
| 2014 | 39 |
| 2015 | 111 |
| 2016 | 17 |
| 2017 | 24 |
| 2018 | 17 |
| 2019 | 14 |
| 2020 | 39 |
| 2021 | 25 |
| 2022 | 17 |
| 2023 | 24 |
| 2024 | 7 |
| 2025 | 14 |
| 2026 | 36 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 2006-01-02 | Record daily precipitation | Record daily precipitation 90.4 mm (3.6 in) |
| 2007-08-29 | Record high minimum temperature | Record high minimum temperature 24.4 C (75.9 F) |
| 2008-01-23 | Record daily precipitation | Record daily precipitation 96.3 mm (3.8 in) |
| 2008-06-20 | Record high maximum temperature | Record high maximum temperature 44.4 C (111.9 F) |
| 2010-12-19 | Record daily precipitation | Record daily precipitation 122.7 mm (4.8 in) |
| 2015-01-01 | Record low minimum temperature | Record low minimum temperature -8.3 C (17.1 F) |
| 2015-12-25 | Record low maximum temperature | Record low maximum temperature 5.6 C (42.1 F) |
| 2020-09-06 | Record high maximum temperature | Record high maximum temperature 46.1 C (115.0 F) |
Wettest Day of Each Month
Dec: 122.7 mm (4.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 96.3 mm (3.8 in) | 23 January 2008 |
| Feb | 70.1 mm (2.8 in) | 10 February 1978 |
| Mar | 108.7 mm (4.3 in) | 20 March 2011 |
| Apr | 49.3 mm (1.9 in) | 6 April 2020 |
| May | 32.8 mm (1.3 in) | 5 May 2005 |
| Jun | 14.7 mm (0.6 in) | 6 June 2011 |
| Jul | 24.6 mm (1.0 in) | 20 July 2015 |
| Aug | 23.6 mm (0.9 in) | 19 August 1976 |
| Sep | 49.0 mm (1.9 in) | 29 September 1976 |
| Oct | 68.6 mm (2.7 in) | 14 October 2009 |
| Nov | 57.2 mm (2.3 in) | 30 November 1982 |
| Dec | 122.7 mm (4.8 in) | 19 December 2010 |
Period of Record Coverage
1962 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1962 | 299 | 82% | No |
| 1963 | 352 | 96% | Yes |
| 1964 | 344 | 94% | Yes |
| 1965 | 346 | 95% | Yes |
| 1966 | 339 | 93% | Yes |
| 1967 | 330 | 90% | Yes |
| 1968 | 312 | 85% | No |
| 1969 | 337 | 92% | Yes |
| 1970 | 305 | 84% | No |
| 1971 | 289 | 79% | No |
| 1972 | 302 | 83% | No |
| 1973 | 203 | 56% | No |
| 1974 | 334 | 92% | Yes |
| 1975 | 331 | 91% | Yes |
| 1976 | 329 | 90% | No |
| 1977 | 361 | 99% | Yes |
| 1978 | 354 | 97% | Yes |
| 1979 | 356 | 98% | Yes |
| 1980 | 328 | 90% | No |
| 1981 | 362 | 99% | Yes |
| 1982 | 345 | 95% | Yes |
| 1983 | 337 | 92% | Yes |
| 1984 | 332 | 91% | Yes |
| 1985 | 331 | 91% | Yes |
| 1986 | 337 | 92% | Yes |
| 1987 | 342 | 94% | Yes |
| 1988 | 299 | 82% | No |
| 1989 | 323 | 88% | No |
| 1990 | 334 | 92% | Yes |
| 1991 | 349 | 96% | Yes |
| 1992 | 233 | 64% | No |
| 1993 | 265 | 73% | No |
| 1994 | 118 | 32% | No |
| 2001 | 208 | 57% | No |
| 2002 | 315 | 86% | No |
| 2003 | 354 | 97% | Yes |
| 2004 | 294 | 80% | No |
| 2005 | 287 | 79% | No |
| 2006 | 346 | 95% | Yes |
| 2007 | 347 | 95% | Yes |
| 2008 | 345 | 94% | Yes |
| 2009 | 344 | 94% | Yes |
| 2010 | 280 | 77% | No |
| 2011 | 358 | 98% | Yes |
| 2012 | 351 | 96% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 364 | 100% | Yes |
| 2016 | 362 | 99% | Yes |
| 2017 | 278 | 76% | No |
| 2018 | 334 | 92% | Yes |
| 2019 | 360 | 99% | Yes |
| 2020 | 352 | 96% | Yes |
| 2021 | 361 | 99% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 263 | 72% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 September 2026 | Twitchell Dam, US | daily high max (Provisional) | 39.4 C (102.9 F) | 2.2 C (4.0 F) | 43 years | 22 of 100 (Routine) |
| 9 September 2026 | Twitchell Dam, US | daily high max (Provisional) | 41.7 C (107.1 F) | 2.8 C (5.0 F) | 41 years | 24 of 100 (Routine) |
| 2 September 2026 | Twitchell Dam, US | daily low min (Provisional) | 6.7 C (44.1 F) | 0.5 C (0.9 F) | 45 years | 20 of 100 (Routine) |
| 26 August 2026 | Twitchell Dam, US | daily high max (Provisional) | 41.1 C (106.0 F) | 3.3 C (5.9 F) | 16 years | 20 of 100 (Routine) |
| 25 August 2026 | Twitchell Dam, US | daily high max (Provisional) | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 16 years | 12 of 100 (Routine) |
| 30 July 2026 | Twitchell Dam, US | daily low min | 5.6 C (42.1 F) | 0.5 C (0.9 F) | 56 years | 24 of 100 (Routine) |
| 7 July 2026 | Twitchell Dam, US | daily high min | 21.1 C (70.0 F) | 4.4 C (7.9 F) | 8 years | 27 of 100 (Routine) |
| 29 June 2026 | Twitchell Dam, US | daily low max | 21.1 C (70.0 F) | 0.6 C (1.1 F) | 39 years | 18 of 100 (Routine) |
| 26 June 2026 | Twitchell Dam, US | daily high min | 20.0 C (68.0 F) | 1.7 C (3.1 F) | 32 years | 21 of 100 (Routine) |
| 2 June 2026 | Twitchell Dam, US | daily high min | 18.3 C (64.9 F) | 4.4 C (7.9 F) | 20 years | 28 of 100 (Routine) |
| 29 May 2026 | Twitchell Dam, US | daily rain | 3.3 mm (0.13 in) | 0.8 mm (0.03 in) | 37 years | 18 of 100 (Routine) |
| 4 April 2026 | Twitchell Dam, US | daily high max | 31.1 C (88.0 F) | 0.5 C (0.9 F) | 36 years | 18 of 100 (Routine) |
| 29 March 2026 | Twitchell Dam, US | daily high max | 31.7 C (89.1 F) | 2.8 C (5.0 F) | 55 years | 28 of 100 (Routine) |
| 27 March 2026 | Twitchell Dam, US | monthly high min (Tie) | 17.2 C (63.0 F) | tie | 4 years | 4 of 100 (Routine) |
| 24 March 2026 | Twitchell Dam, US | daily high max | 33.9 C (93.0 F) | 4.5 C (8.1 F) | 17 years | 21 of 100 (Routine) |
| 23 March 2026 | Twitchell Dam, US | daily high max | 33.9 C (93.0 F) | 3.9 C (7.0 F) | 4 years | 16 of 100 (Routine) |
| 21 March 2026 | Twitchell Dam, US | daily high max | 31.7 C (89.1 F) | 2.8 C (5.0 F) | 32 years | 21 of 100 (Routine) |
| 20 March 2026 | Twitchell Dam, US | daily high min | 16.7 C (62.1 F) | 3.9 C (7.0 F) | 36 years | 28 of 100 (Routine) |
| 20 March 2026 | Twitchell Dam, US | daily high max | 34.4 C (93.9 F) | 3.8 C (6.8 F) | 36 years | 24 of 100 (Routine) |
| 19 March 2026 | Twitchell Dam, US | daily high max | 35.6 C (96.1 F) | 6.7 C (12.1 F) | 41 years | 33 of 100 (Routine) |
Climate Trend
40 complete years, 1963 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1963 | 15.2 C | -0.20 C |
| 1964 | 14.4 C | -1.09 C |
| 1965 | 14.6 C | -0.80 C |
| 1966 | 15.1 C | -0.39 C |
| 1967 | 15.5 C | +0.06 C |
| 1968 | 15.3 C | -0.16 C |
| 1969 | 14.9 C | -0.50 C |
| 1974 | 15.3 C | -0.13 C |
| 1975 | 14.6 C | -0.82 C |
| 1976 | 15.9 C | +0.43 C |
| 1977 | 15.7 C | +0.25 C |
| 1978 | 15.5 C | +0.07 C |
| 1979 | 15.2 C | -0.24 C |
| 1981 | 15.6 C | +0.15 C |
| 1982 | 14.7 C | -0.77 C |
| 1983 | 15.7 C | +0.25 C |
| 1984 | 16.3 C | +0.84 C |
| 1985 | 15.0 C | -0.42 C |
| 1986 | 15.4 C | -0.05 C |
| 1987 | 14.7 C | -0.78 C |
| 1989 | 15.5 C | +0.01 C |
| 1990 | 15.2 C | -0.22 C |
| 1991 | 15.3 C | -0.18 C |
| 2003 | 16.3 C | +0.86 C |
| 2006 | 16.5 C | +1.01 C |
| 2007 | 15.5 C | +0.07 C |
| 2008 | 15.8 C | +0.39 C |
| 2009 | 15.4 C | -0.03 C |
| 2011 | 15.8 C | +0.38 C |
| 2012 | 16.5 C | +1.10 C |
| 2013 | 16.2 C | +0.77 C |
| 2014 | 14.1 C | -1.31 C |
| 2015 | 13.3 C | -2.12 C |
| 2019 | 16.0 C | +0.57 C |
| 2020 | 16.8 C | +1.34 C |
| 2021 | 15.7 C | +0.22 C |
| 2022 | 15.9 C | +0.50 C |
| 2023 | 15.3 C | -0.19 C |
| 2024 | 15.9 C | +0.46 C |
| 2025 | 16.0 C | +0.60 C |
The annual mean temperature here has risen by 0.12 C (0.02 to 0.22) per decade over 1963 to 2025. In Fahrenheit: 0.22 F (0.03 to 0.40) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.12 C (0.02 to 0.22) per decade | 0.22 F (0.03 to 0.40) per decade | 1963 to 2025 | 40 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1963 to 2025 | 40 | Rise |
| Mean daily minimum | 0.02 C (-0.14 to 0.17) per decade | 0.03 F (-0.25 to 0.31) per decade | 1963 to 2025 | 40 | Not 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
1962 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.1 C (115.0 F) | 2020 | 40.0 C (104.0 F) | 59 |
| Coldest night (TNn) | -8.3 C (17.1 F) | 2015 | -2.8 C (27.0 F) | 59 |
| Wettest day (Rx1day) | 122.7 mm (4.8 in) | 2010 | 48.3 mm (1.9 in) | 59 |
| Wettest five days (Rx5day) | 252.5 mm (9.9 in) | 2010 | 81.6 mm (3.2 in) | 59 |
| Longest dry spell (CDD) | 218 days | 2021 | 115 days | 59 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1962 | 41.1 C (106.0 F) |
| 1963 | 41.1 C (106.0 F) |
| 1964 | 37.2 C (99.0 F) |
| 1965 | 37.8 C (100.0 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 40.0 C (104.0 F) |
| 1969 | 42.8 C (109.0 F) |
| 1970 | 39.4 C (102.9 F) |
| 1971 | 42.2 C (108.0 F) |
| 1972 | 40.0 C (104.0 F) |
| 1973 | 40.6 C (105.1 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 38.9 C (102.0 F) |
| 1976 | 40.6 C (105.1 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 40.6 C (105.1 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 42.8 C (109.0 F) |
| 1981 | 40.0 C (104.0 F) |
| 1982 | 40.0 C (104.0 F) |
| 1983 | 38.9 C (102.0 F) |
| 1984 | 38.9 C (102.0 F) |
| 1985 | 41.1 C (106.0 F) |
| 1986 | 33.9 C (93.0 F) |
| 1987 | 41.1 C (106.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 43.9 C (111.0 F) |
| 1990 | 38.9 C (102.0 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 36.1 C (97.0 F) |
| 1993 | 41.1 C (106.0 F) |
| 1994 | 30.0 C (86.0 F) |
| 2001 | 39.4 C (102.9 F) |
| 2002 | 42.2 C (108.0 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 41.7 C (107.1 F) |
| 2005 | 37.8 C (100.0 F) |
| 2006 | 40.0 C (104.0 F) |
| 2007 | 43.9 C (111.0 F) |
| 2008 | 44.4 C (111.9 F) |
| 2009 | 42.8 C (109.0 F) |
| 2010 | 37.8 C (100.0 F) |
| 2011 | 38.3 C (100.9 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 41.1 C (106.0 F) |
| 2014 | 37.8 C (100.0 F) |
| 2015 | 37.8 C (100.0 F) |
| 2016 | 40.6 C (105.1 F) |
| 2017 | 40.6 C (105.1 F) |
| 2018 | 42.2 C (108.0 F) |
| 2019 | 38.9 C (102.0 F) |
| 2020 | 46.1 C (115.0 F) |
| 2021 | 43.3 C (109.9 F) |
| 2022 | 43.3 C (109.9 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 42.8 C (109.0 F) |
| 2025 | 37.2 C (99.0 F) |
| 2026 | 41.7 C (107.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1962 | -3.9 C (25.0 F) |
| 1963 | -4.4 C (24.1 F) |
| 1964 | -2.8 C (27.0 F) |
| 1965 | -3.9 C (25.0 F) |
| 1966 | -2.2 C (28.0 F) |
| 1967 | -3.3 C (26.1 F) |
| 1968 | -1.1 C (30.0 F) |
| 1969 | 0.0 C (32.0 F) |
| 1970 | 0.0 C (32.0 F) |
| 1971 | -4.4 C (24.1 F) |
| 1972 | -4.4 C (24.1 F) |
| 1973 | -5.0 C (23.0 F) |
| 1974 | -2.8 C (27.0 F) |
| 1975 | -5.0 C (23.0 F) |
| 1976 | -4.4 C (24.1 F) |
| 1977 | -1.7 C (28.9 F) |
| 1978 | -3.3 C (26.1 F) |
| 1979 | -2.2 C (28.0 F) |
| 1980 | -1.1 C (30.0 F) |
| 1981 | 0.0 C (32.0 F) |
| 1982 | -0.6 C (30.9 F) |
| 1983 | 0.6 C (33.1 F) |
| 1984 | -2.2 C (28.0 F) |
| 1985 | -2.8 C (27.0 F) |
| 1986 | -1.7 C (28.9 F) |
| 1987 | -7.2 C (19.0 F) |
| 1988 | -2.8 C (27.0 F) |
| 1989 | -3.9 C (25.0 F) |
| 1990 | -7.2 C (19.0 F) |
| 1991 | -2.8 C (27.0 F) |
| 1992 | -1.1 C (30.0 F) |
| 1993 | -1.7 C (28.9 F) |
| 1994 | 1.1 C (34.0 F) |
| 2001 | -0.6 C (30.9 F) |
| 2002 | -3.3 C (26.1 F) |
| 2003 | -1.1 C (30.0 F) |
| 2004 | -2.2 C (28.0 F) |
| 2005 | 1.7 C (35.1 F) |
| 2006 | -1.7 C (28.9 F) |
| 2007 | -6.7 C (19.9 F) |
| 2008 | -3.3 C (26.1 F) |
| 2009 | -5.0 C (23.0 F) |
| 2010 | -3.3 C (26.1 F) |
| 2011 | -0.6 C (30.9 F) |
| 2012 | -2.8 C (27.0 F) |
| 2013 | -7.2 C (19.0 F) |
| 2014 | -5.6 C (21.9 F) |
| 2015 | -8.3 C (17.1 F) |
| 2016 | -2.8 C (27.0 F) |
| 2017 | -1.1 C (30.0 F) |
| 2018 | -1.7 C (28.9 F) |
| 2019 | -2.2 C (28.0 F) |
| 2020 | -2.8 C (27.0 F) |
| 2021 | -2.8 C (27.0 F) |
| 2022 | -2.2 C (28.0 F) |
| 2023 | -1.7 C (28.9 F) |
| 2024 | -1.1 C (30.0 F) |
| 2025 | -1.7 C (28.9 F) |
| 2026 | 1.7 C (35.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1962 | 16.8 mm (0.7 in) |
| 1963 | 41.1 mm (1.6 in) |
| 1964 | 34.0 mm (1.3 in) |
| 1965 | 52.8 mm (2.1 in) |
| 1966 | 72.4 mm (2.9 in) |
| 1967 | 50.8 mm (2.0 in) |
| 1968 | 27.2 mm (1.1 in) |
| 1969 | 61.5 mm (2.4 in) |
| 1970 | 55.4 mm (2.2 in) |
| 1971 | 33.0 mm (1.3 in) |
| 1972 | 31.2 mm (1.2 in) |
| 1973 | 53.3 mm (2.1 in) |
| 1974 | 62.5 mm (2.5 in) |
| 1975 | 40.4 mm (1.6 in) |
| 1976 | 49.0 mm (1.9 in) |
| 1977 | 69.6 mm (2.7 in) |
| 1978 | 70.1 mm (2.8 in) |
| 1979 | 35.1 mm (1.4 in) |
| 1980 | 44.5 mm (1.8 in) |
| 1981 | 59.4 mm (2.3 in) |
| 1982 | 57.2 mm (2.3 in) |
| 1983 | 65.3 mm (2.6 in) |
| 1984 | 29.2 mm (1.1 in) |
| 1985 | 32.8 mm (1.3 in) |
| 1986 | 46.5 mm (1.8 in) |
| 1987 | 50.8 mm (2.0 in) |
| 1988 | 43.9 mm (1.7 in) |
| 1989 | 25.4 mm (1.0 in) |
| 1990 | 31.8 mm (1.3 in) |
| 1991 | 53.1 mm (2.1 in) |
| 1992 | 46.5 mm (1.8 in) |
| 1993 | 61.0 mm (2.4 in) |
| 1994 | 32.3 mm (1.3 in) |
| 2001 | 31.0 mm (1.2 in) |
| 2002 | 53.8 mm (2.1 in) |
| 2003 | 43.9 mm (1.7 in) |
| 2004 | 59.2 mm (2.3 in) |
| 2005 | 38.4 mm (1.5 in) |
| 2006 | 90.4 mm (3.6 in) |
| 2007 | 48.3 mm (1.9 in) |
| 2008 | 96.3 mm (3.8 in) |
| 2009 | 68.6 mm (2.7 in) |
| 2010 | 122.7 mm (4.8 in) |
| 2011 | 108.7 mm (4.3 in) |
| 2012 | 41.7 mm (1.6 in) |
| 2013 | 22.6 mm (0.9 in) |
| 2014 | 101.3 mm (4.0 in) |
| 2015 | 31.8 mm (1.3 in) |
| 2016 | 33.0 mm (1.3 in) |
| 2017 | 56.6 mm (2.2 in) |
| 2018 | 48.3 mm (1.9 in) |
| 2019 | 30.2 mm (1.2 in) |
| 2020 | 49.3 mm (1.9 in) |
| 2021 | 53.3 mm (2.1 in) |
| 2022 | 29.2 mm (1.1 in) |
| 2023 | 90.7 mm (3.6 in) |
| 2024 | 39.1 mm (1.5 in) |
| 2025 | 49.0 mm (1.9 in) |
| 2026 | 27.2 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1962 | 16.8 mm (0.7 in) |
| 1963 | 75.2 mm (3.0 in) |
| 1964 | 65.1 mm (2.6 in) |
| 1965 | 72.9 mm (2.9 in) |
| 1966 | 146.1 mm (5.8 in) |
| 1967 | 83.0 mm (3.3 in) |
| 1968 | 48.3 mm (1.9 in) |
| 1969 | 149.1 mm (5.9 in) |
| 1970 | 74.2 mm (2.9 in) |
| 1971 | 65.1 mm (2.6 in) |
| 1972 | 69.5 mm (2.7 in) |
| 1973 | 121.4 mm (4.8 in) |
| 1974 | 81.6 mm (3.2 in) |
| 1975 | 86.1 mm (3.4 in) |
| 1976 | 110.5 mm (4.4 in) |
| 1977 | 79.3 mm (3.1 in) |
| 1978 | 188.3 mm (7.4 in) |
| 1979 | 74.2 mm (2.9 in) |
| 1980 | 140.5 mm (5.5 in) |
| 1981 | 99.5 mm (3.9 in) |
| 1982 | 76.7 mm (3.0 in) |
| 1983 | 95.3 mm (3.8 in) |
| 1984 | 68.9 mm (2.7 in) |
| 1985 | 51.8 mm (2.0 in) |
| 1986 | 85.9 mm (3.4 in) |
| 1987 | 74.9 mm (2.9 in) |
| 1988 | 82.6 mm (3.3 in) |
| 1989 | 25.9 mm (1.0 in) |
| 1990 | 87.0 mm (3.4 in) |
| 1991 | 140.3 mm (5.5 in) |
| 1992 | 111.7 mm (4.4 in) |
| 1993 | 132.7 mm (5.2 in) |
| 1994 | 71.9 mm (2.8 in) |
| 2001 | 41.9 mm (1.6 in) |
| 2002 | 123.6 mm (4.9 in) |
| 2003 | 45.2 mm (1.8 in) |
| 2004 | 119.1 mm (4.7 in) |
| 2005 | 115.1 mm (4.5 in) |
| 2006 | 162.0 mm (6.4 in) |
| 2007 | 76.8 mm (3.0 in) |
| 2008 | 147.8 mm (5.8 in) |
| 2009 | 73.2 mm (2.9 in) |
| 2010 | 252.5 mm (9.9 in) |
| 2011 | 68.8 mm (2.7 in) |
| 2012 | 72.7 mm (2.9 in) |
| 2013 | 35.3 mm (1.4 in) |
| 2014 | 104.7 mm (4.1 in) |
| 2015 | 50.9 mm (2.0 in) |
| 2016 | 73.9 mm (2.9 in) |
| 2017 | 110.9 mm (4.4 in) |
| 2018 | 100.7 mm (4.0 in) |
| 2019 | 78.7 mm (3.1 in) |
| 2020 | 87.9 mm (3.5 in) |
| 2021 | 102.1 mm (4.0 in) |
| 2022 | 56.5 mm (2.2 in) |
| 2023 | 123.0 mm (4.8 in) |
| 2024 | 64.0 mm (2.5 in) |
| 2025 | 144.3 mm (5.7 in) |
| 2026 | 78.8 mm (3.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1962 | 140 days |
| 1963 | 70 days |
| 1964 | 83 days |
| 1965 | 214 days |
| 1966 | 110 days |
| 1967 | 96 days |
| 1968 | 151 days |
| 1969 | 95 days |
| 1970 | 133 days |
| 1971 | 64 days |
| 1972 | 72 days |
| 1973 | 71 days |
| 1974 | 165 days |
| 1975 | 163 days |
| 1976 | 69 days |
| 1977 | 169 days |
| 1978 | 130 days |
| 1979 | 144 days |
| 1980 | 154 days |
| 1981 | 165 days |
| 1982 | 77 days |
| 1983 | 77 days |
| 1984 | 125 days |
| 1985 | 117 days |
| 1986 | 58 days |
| 1987 | 98 days |
| 1988 | 113 days |
| 1989 | 129 days |
| 1990 | 115 days |
| 1991 | 119 days |
| 1992 | 81 days |
| 1993 | 39 days |
| 1994 | 22 days |
| 2001 | 115 days |
| 2002 | 103 days |
| 2003 | 179 days |
| 2004 | 204 days |
| 2005 | 121 days |
| 2006 | 73 days |
| 2007 | 140 days |
| 2008 | 131 days |
| 2009 | 111 days |
| 2010 | 53 days |
| 2011 | 3 days |
| 2012 | 71 days |
| 2013 | 191 days |
| 2014 | 188 days |
| 2015 | 55 days |
| 2016 | 161 days |
| 2017 | 61 days |
| 2018 | 166 days |
| 2019 | 89 days |
| 2020 | 83 days |
| 2021 | 218 days |
| 2022 | 193 days |
| 2023 | 98 days |
| 2024 | 137 days |
| 2025 | 145 days |
| 2026 | 96 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
30 years with a frostAcross 30 years with a frost, the median last spring frost at Twitchell Dam falls on 11 March and the median first autumn frost on 29 November, which leaves a median of 262 days between them.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1963 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 11 March | n/a | 11 March | n/a | -3.7 days per decade |
| First autumn frost | 29 November | n/a | 29 November | n/a | -1.9 days per decade |
| Growing days | 262 days | n/a | 262 days | n/a | +1.9 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
49 years, 1963 to 2025A day with at least 46.9 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 111.0 mm (4.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 46.9 mm (1.8 in) | |
| 5 years | 63.7 mm (2.5 in) | |
| 10 years | 75.0 mm (3.0 in) | |
| 25 years | 89.4 mm (3.5 in) | |
| 50 years | 100.2 mm (3.9 in) | Longer than the 49 years of record |
| 100 years | 111.0 mm (4.4 in) | Longer than the 49 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, 49 years of values from 1963 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: 101.3 mm (4.0 in) in 2014; 96.3 mm (3.8 in) in 2008; 90.7 mm (3.6 in) in 2023.
Climate Twins
2007 to 2025 against 1961 to 1990Over 2007 to 2025, Twitchell Dam had a mean temperature of 15.6 C (60.1 F) and 376.9 mm (14.8 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Laguna Beach (United States, 283 km away), Oxnard (United States, 137 km away) and Santa Paula (United States, 132 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Laguna Beach | United States | 283 km (176 mi) | 15.8 C (60.4 F) | 300.4 mm (11.8 in) | 0.58 |
| Oxnard | United States | 137 km (85 mi) | 16.0 C (60.7 F) | 353.5 mm (13.9 in) | 0.65 |
| Santa Paula | United States | 132 km (82 mi) | 16.2 C (61.2 F) | 398.5 mm (15.7 in) | 0.76 |
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
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).