Sonoma Weather Records (USC00048351)
Record envelope, standing records and threshold days for Sonoma (USC00048351), California, United States, with 134 years of record.
Key Facts for Sonoma
- Sonoma (USC00048351) is a weather station in California, United States at 38.30 latitude and -122.46 longitude, 30 m (97 ft) above sea level.
- The station reports from 1893 to 2026, 134 years of record.
- 1,464 records set at Sonoma still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Sonoma tied a daily record high maximum temperature of 37.8 C (100.0 F) on 11 June 2026.
About the Station
- Location: California, United States, 38.30 latitude, -122.46 longitude.
- Elevation: 30 m (97 ft).
- Period of record: 1893 to 2026, 134 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
5 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 28.9 C (84.0 F) | -6.7 C (19.9 F) | 20.0 C (68.0 F) | 0.0 C (32.0 F) |
| Feb | 36.7 C (98.1 F) | -6.7 C (19.9 F) | 25.6 C (78.1 F) | -1.1 C (30.0 F) |
| Mar | 32.2 C (90.0 F) | -4.4 C (24.1 F) | 31.7 C (89.1 F) | 4.4 C (39.9 F) |
| Apr | 37.8 C (100.0 F) | -6.7 C (19.9 F) | 27.8 C (82.0 F) | 4.4 C (39.9 F) |
| May | 40.6 C (105.1 F) | -2.8 C (27.0 F) | 31.7 C (89.1 F) | 7.2 C (45.0 F) |
| Jun | 44.4 C (111.9 F) | -0.6 C (30.9 F) | 37.8 C (100.0 F) | 6.7 C (44.1 F) |
| Jul | 46.7 C (116.1 F) | 1.7 C (35.1 F) | 37.8 C (100.0 F) | 9.4 C (48.9 F) |
| Aug | 42.2 C (108.0 F) | 2.2 C (36.0 F) | 36.7 C (98.1 F) | 8.3 C (46.9 F) |
| Sep | 43.3 C (109.9 F) | 1.1 C (34.0 F) | 33.9 C (93.0 F) | 8.3 C (46.9 F) |
| Oct | 41.7 C (107.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| Nov | 32.8 C (91.0 F) | -5.6 C (21.9 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -10.6 C (12.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1893 | 46 |
| 1894 | 84 |
| 1905 | 56 |
| 1906 | 19 |
| 1907 | 10 |
| 1951 | 2 |
| 1952 | 39 |
| 1953 | 33 |
| 1954 | 36 |
| 1955 | 57 |
| 1956 | 16 |
| 1957 | 19 |
| 1958 | 13 |
| 1959 | 21 |
| 1960 | 17 |
| 1961 | 24 |
| 1962 | 24 |
| 1963 | 29 |
| 1964 | 23 |
| 1965 | 22 |
| 1966 | 25 |
| 1967 | 23 |
| 1968 | 20 |
| 1969 | 19 |
| 1970 | 26 |
| 1971 | 21 |
| 1972 | 30 |
| 1973 | 26 |
| 1974 | 19 |
| 1975 | 14 |
| 1976 | 39 |
| 1977 | 18 |
| 1978 | 7 |
| 1979 | 11 |
| 1980 | 13 |
| 1981 | 19 |
| 1982 | 13 |
| 1983 | 15 |
| 1984 | 15 |
| 1985 | 25 |
| 1986 | 7 |
| 1987 | 10 |
| 1988 | 15 |
| 1989 | 27 |
| 1990 | 20 |
| 1991 | 10 |
| 1992 | 7 |
| 1993 | 8 |
| 1994 | 9 |
| 1995 | 12 |
| 1996 | 11 |
| 1997 | 9 |
| 1998 | 10 |
| 1999 | 7 |
| 2000 | 16 |
| 2001 | 11 |
| 2002 | 9 |
| 2003 | 11 |
| 2004 | 14 |
| 2005 | 6 |
| 2006 | 14 |
| 2007 | 7 |
| 2008 | 5 |
| 2009 | 8 |
| 2010 | 12 |
| 2011 | 24 |
| 2012 | 17 |
| 2013 | 16 |
| 2014 | 12 |
| 2015 | 12 |
| 2016 | 8 |
| 2017 | 8 |
| 2018 | 9 |
| 2019 | 10 |
| 2020 | 15 |
| 2021 | 7 |
| 2022 | 18 |
| 2023 | 16 |
| 2024 | 12 |
| 2025 | 10 |
| 2026 | 7 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1977-11-21 | Record daily precipitation | Record daily precipitation 137.2 mm (5.4 in) |
| 1979-01-11 | Record daily precipitation | Record daily precipitation 146.1 mm (5.8 in) |
| 1982-01-04 | Record daily precipitation | Record daily precipitation 171.5 mm (6.8 in) |
| 1990-12-22 | Record low minimum temperature | Record low minimum temperature -10.6 C (12.9 F) |
| 2008-05-15 | Record high minimum temperature | Record high minimum temperature 25.6 C (78.1 F) |
Wettest Day of Each Month
Jan: 171.5 mm (6.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 171.5 mm (6.8 in) | 4 January 1982 |
| Feb | 100.1 mm (3.9 in) | 14 February 1986 |
| Mar | 73.7 mm (2.9 in) | 9 March 1995 |
| Apr | 71.1 mm (2.8 in) | 27 April 1953 |
| May | 41.7 mm (1.6 in) | 27 May 1990 |
| Jun | 46.2 mm (1.8 in) | 2 June 1967 |
| Jul | 25.9 mm (1.0 in) | 8 July 1974 |
| Aug | 24.9 mm (1.0 in) | 20 August 1997 |
| Sep | 68.6 mm (2.7 in) | 18 September 1959 |
| Oct | 111.3 mm (4.4 in) | 12 October 1962 |
| Nov | 137.2 mm (5.4 in) | 21 November 1977 |
| Dec | 110.7 mm (4.4 in) | 31 December 2005 |
Period of Record Coverage
1893 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1893 | 302 | 83% | No |
| 1894 | 187 | 51% | No |
| 1898 | 1 | 0% | No |
| 1899 | 3 | 1% | No |
| 1905 | 348 | 95% | Yes |
| 1906 | 303 | 83% | No |
| 1907 | 134 | 37% | No |
| 1951 | 55 | 15% | No |
| 1952 | 337 | 92% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 363 | 99% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 359 | 98% | Yes |
| 1959 | 349 | 96% | Yes |
| 1960 | 353 | 96% | Yes |
| 1961 | 361 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 354 | 97% | Yes |
| 1979 | 327 | 90% | No |
| 1980 | 363 | 99% | Yes |
| 1981 | 362 | 99% | Yes |
| 1982 | 331 | 91% | Yes |
| 1983 | 306 | 84% | No |
| 1984 | 282 | 77% | No |
| 1985 | 171 | 47% | No |
| 1986 | 329 | 90% | Yes |
| 1987 | 297 | 81% | No |
| 1988 | 340 | 93% | Yes |
| 1989 | 356 | 98% | Yes |
| 1990 | 363 | 99% | Yes |
| 1991 | 343 | 94% | Yes |
| 1992 | 336 | 92% | Yes |
| 1993 | 310 | 85% | No |
| 1994 | 323 | 88% | No |
| 1995 | 321 | 88% | No |
| 1996 | 318 | 87% | No |
| 1997 | 315 | 86% | No |
| 1998 | 309 | 85% | No |
| 1999 | 304 | 83% | No |
| 2000 | 303 | 83% | No |
| 2001 | 304 | 83% | No |
| 2002 | 308 | 84% | No |
| 2003 | 298 | 82% | No |
| 2004 | 314 | 86% | No |
| 2005 | 295 | 81% | No |
| 2006 | 304 | 83% | No |
| 2007 | 299 | 82% | No |
| 2008 | 310 | 85% | No |
| 2009 | 308 | 84% | No |
| 2010 | 277 | 76% | No |
| 2011 | 306 | 84% | No |
| 2012 | 312 | 85% | No |
| 2013 | 338 | 93% | Yes |
| 2014 | 342 | 94% | Yes |
| 2015 | 360 | 99% | Yes |
| 2016 | 362 | 99% | Yes |
| 2017 | 239 | 65% | No |
| 2018 | 353 | 97% | Yes |
| 2019 | 355 | 97% | Yes |
| 2020 | 337 | 92% | Yes |
| 2021 | 348 | 95% | Yes |
| 2022 | 357 | 98% | Yes |
| 2023 | 354 | 97% | Yes |
| 2024 | 357 | 98% | Yes |
| 2025 | 358 | 98% | Yes |
| 2026 | 240 | 66% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 11 June 2026 | Sonoma, US | daily high max (Tie) | 37.8 C (100.0 F) | tie | 47 years | 6 of 100 (Routine) |
| 21 March 2026 | Sonoma, US | daily high max | 31.7 C (89.1 F) | 4.5 C (8.1 F) | 65 years | 39 of 100 (Notable) |
| 20 March 2026 | Sonoma, US | daily high max | 31.1 C (88.0 F) | 2.8 C (5.0 F) | 21 years | 22 of 100 (Routine) |
| 20 March 2026 | Sonoma, US | daily high min (Tie) | 11.7 C (53.1 F) | tie | 28 years | 4 of 100 (Routine) |
| 19 March 2026 | Sonoma, US | daily high max | 30.0 C (86.0 F) | 2.8 C (5.0 F) | 65 years | 35 of 100 (Notable) |
| 18 March 2026 | Sonoma, US | daily high max | 30.0 C (86.0 F) | 1.1 C (2.0 F) | 21 years | 18 of 100 (Routine) |
| 7 March 2026 | Sonoma, US | daily high min (Tie) | 12.2 C (54.0 F) | tie | 65 years | 7 of 100 (Routine) |
| 28 February 2026 | Sonoma, US | daily high min | 13.3 C (55.9 F) | 1.6 C (2.9 F) | 68 years | 34 of 100 (Routine) |
| 25 February 2026 | Sonoma, US | daily high min | 13.9 C (57.0 F) | 1.7 C (3.1 F) | 68 years | 34 of 100 (Routine) |
| 16 February 2026 | Sonoma, US | daily rain | 50.8 mm (2.0 in) | 6.9 mm (0.27 in) | 40 years | 26 of 100 (Routine) |
| 3 January 2026 | Sonoma, US | daily high min | 11.7 C (53.1 F) | 2.8 C (5.0 F) | 48 years | 30 of 100 (Routine) |
| 21 December 2025 | Sonoma, US | daily high min | 14.4 C (57.9 F) | 0.5 C (0.9 F) | 70 years | 32 of 100 (Routine) |
| 20 December 2025 | Sonoma, US | daily high min | 13.9 C (57.0 F) | 0.6 C (1.1 F) | 70 years | 32 of 100 (Routine) |
| 20 December 2025 | Sonoma, US | daily rain | 56.4 mm (2.2 in) | 8.4 mm (0.33 in) | 56 years | 31 of 100 (Routine) |
| 19 December 2025 | Sonoma, US | daily high min (Tie) | 11.7 C (53.1 F) | tie | 2 years | 2 of 100 (Routine) |
| 10 December 2025 | Sonoma, US | daily low max | 8.9 C (48.0 F) | 0.5 C (0.9 F) | 64 years | 30 of 100 (Routine) |
| 29 November 2025 | Sonoma, US | daily low max | 10.6 C (51.1 F) | 0.5 C (0.9 F) | 72 years | 32 of 100 (Routine) |
| 5 November 2025 | Sonoma, US | daily high min | 13.9 C (57.0 F) | 0.6 C (1.1 F) | 55 years | 27 of 100 (Routine) |
| 29 October 2025 | Sonoma, US | daily high min | 14.4 C (57.9 F) | 0.5 C (0.9 F) | 52 years | 26 of 100 (Routine) |
| 14 October 2025 | Sonoma, US | daily low max | 15.6 C (60.1 F) | 1.6 C (2.9 F) | 56 years | 29 of 100 (Routine) |
Climate Trend
64 complete years, 1953 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1953 | 13.8 C | -1.25 C |
| 1954 | 13.5 C | -1.57 C |
| 1955 | 13.5 C | -1.55 C |
| 1956 | 13.9 C | -1.16 C |
| 1957 | 14.3 C | -0.77 C |
| 1958 | 15.3 C | +0.25 C |
| 1960 | 14.7 C | -0.34 C |
| 1961 | 14.5 C | -0.53 C |
| 1962 | 14.3 C | -0.73 C |
| 1963 | 14.2 C | -0.89 C |
| 1964 | 14.3 C | -0.80 C |
| 1965 | 14.1 C | -0.96 C |
| 1966 | 14.7 C | -0.37 C |
| 1967 | 14.4 C | -0.64 C |
| 1968 | 14.7 C | -0.32 C |
| 1969 | 14.5 C | -0.52 C |
| 1970 | 14.8 C | -0.26 C |
| 1971 | 13.9 C | -1.14 C |
| 1972 | 14.9 C | -0.13 C |
| 1973 | 15.7 C | +0.68 C |
| 1974 | 15.5 C | +0.43 C |
| 1975 | 15.0 C | -0.05 C |
| 1976 | 15.2 C | +0.15 C |
| 1977 | 15.7 C | +0.67 C |
| 1978 | 16.0 C | +0.95 C |
| 1981 | 16.0 C | +0.92 C |
| 1982 | 14.5 C | -0.58 C |
| 1983 | 15.7 C | +0.64 C |
| 1986 | 15.5 C | +0.42 C |
| 1988 | 15.5 C | +0.44 C |
| 1989 | 14.8 C | -0.29 C |
| 1990 | 15.3 C | +0.26 C |
| 1991 | 15.1 C | +0.02 C |
| 1992 | 15.7 C | +0.63 C |
| 1993 | 15.2 C | +0.12 C |
| 1994 | 14.8 C | -0.29 C |
| 1995 | 15.9 C | +0.81 C |
| 1996 | 15.9 C | +0.84 C |
| 1997 | 16.3 C | +1.20 C |
| 1998 | 14.8 C | -0.30 C |
| 1999 | 14.7 C | -0.32 C |
| 2000 | 15.3 C | +0.23 C |
| 2001 | 15.7 C | +0.61 C |
| 2002 | 15.3 C | +0.23 C |
| 2003 | 15.5 C | +0.40 C |
| 2004 | 15.7 C | +0.61 C |
| 2005 | 15.0 C | -0.04 C |
| 2006 | 14.9 C | -0.21 C |
| 2007 | 15.1 C | +0.07 C |
| 2008 | 15.1 C | +0.05 C |
| 2009 | 14.7 C | -0.37 C |
| 2011 | 14.0 C | -1.10 C |
| 2012 | 14.9 C | -0.21 C |
| 2014 | 16.2 C | +1.10 C |
| 2015 | 15.8 C | +0.78 C |
| 2016 | 15.4 C | +0.35 C |
| 2018 | 15.3 C | +0.25 C |
| 2019 | 15.2 C | +0.15 C |
| 2020 | 16.1 C | +1.06 C |
| 2021 | 15.7 C | +0.59 C |
| 2022 | 15.7 C | +0.67 C |
| 2023 | 14.9 C | -0.12 C |
| 2024 | 16.0 C | +0.96 C |
| 2025 | 15.6 C | +0.51 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1953 to 2025. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 64 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1953 to 2025 | 64 | Rise |
| Mean daily maximum | -0.03 C (-0.12 to 0.06) per decade | -0.1 F (-0.2 to 0.1) per decade | 1953 to 2025 | 64 | Not clearly different from zero |
| Mean daily minimum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.6 to 0.8) per decade | 1953 to 2025 | 64 | Rise |
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 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.7 C (116.1 F) | 1972 | 40.6 C (105.1 F) | 83 |
| Coldest night (TNn) | -10.6 C (12.9 F) | 1990 | -3.9 C (25.0 F) | 83 |
| Wettest day (Rx1day) | 171.5 mm (6.8 in) | 1982 | 58.4 mm (2.3 in) | 89 |
| Wettest five days (Rx5day) | 298.7 mm (11.8 in) | 1986 | 117.7 mm (4.6 in) | 89 |
| Longest dry spell (CDD) | 181 days | 2003 | 109 days | 89 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | 33.9 C (93.0 F) |
| 1894 | 36.7 C (98.1 F) |
| 1898 | 36.7 C (98.1 F) |
| 1899 | 34.4 C (93.9 F) |
| 1900 | n/a |
| 1901 | n/a |
| 1902 | n/a |
| 1903 | n/a |
| 1904 | n/a |
| 1905 | 41.1 C (106.0 F) |
| 1906 | 37.2 C (99.0 F) |
| 1907 | 30.6 C (87.1 F) |
| 1909 | n/a |
| 1951 | 26.1 C (79.0 F) |
| 1952 | 41.1 C (106.0 F) |
| 1953 | 41.1 C (106.0 F) |
| 1954 | 41.7 C (107.1 F) |
| 1955 | 43.3 C (109.9 F) |
| 1956 | 40.6 C (105.1 F) |
| 1957 | 42.8 C (109.0 F) |
| 1958 | 40.6 C (105.1 F) |
| 1959 | 42.8 C (109.0 F) |
| 1960 | 42.2 C (108.0 F) |
| 1961 | 44.4 C (111.9 F) |
| 1962 | 39.4 C (102.9 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 41.1 C (106.0 F) |
| 1967 | 40.0 C (104.0 F) |
| 1968 | 41.1 C (106.0 F) |
| 1969 | 40.0 C (104.0 F) |
| 1970 | 41.1 C (106.0 F) |
| 1971 | 43.3 C (109.9 F) |
| 1972 | 46.7 C (116.1 F) |
| 1973 | 42.8 C (109.0 F) |
| 1974 | 41.1 C (106.0 F) |
| 1975 | 42.8 C (109.0 F) |
| 1976 | 43.9 C (111.0 F) |
| 1977 | 42.2 C (108.0 F) |
| 1978 | 41.1 C (106.0 F) |
| 1979 | 42.8 C (109.0 F) |
| 1980 | 42.8 C (109.0 F) |
| 1981 | 42.8 C (109.0 F) |
| 1982 | 40.0 C (104.0 F) |
| 1983 | 41.7 C (107.1 F) |
| 1984 | 42.8 C (109.0 F) |
| 1985 | 40.6 C (105.1 F) |
| 1986 | 37.2 C (99.0 F) |
| 1987 | 38.3 C (100.9 F) |
| 1988 | 43.3 C (109.9 F) |
| 1989 | 40.0 C (104.0 F) |
| 1990 | 40.0 C (104.0 F) |
| 1991 | 40.6 C (105.1 F) |
| 1992 | 38.9 C (102.0 F) |
| 1993 | 40.0 C (104.0 F) |
| 1994 | 40.6 C (105.1 F) |
| 1995 | 40.6 C (105.1 F) |
| 1996 | 39.4 C (102.9 F) |
| 1997 | 41.1 C (106.0 F) |
| 1998 | 42.2 C (108.0 F) |
| 1999 | 41.1 C (106.0 F) |
| 2000 | 44.4 C (111.9 F) |
| 2001 | 41.1 C (106.0 F) |
| 2002 | 40.6 C (105.1 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 38.3 C (100.9 F) |
| 2005 | 38.3 C (100.9 F) |
| 2006 | 43.9 C (111.0 F) |
| 2007 | 39.4 C (102.9 F) |
| 2008 | 41.1 C (106.0 F) |
| 2009 | 40.0 C (104.0 F) |
| 2010 | 40.0 C (104.0 F) |
| 2011 | 36.7 C (98.1 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 38.9 C (102.0 F) |
| 2014 | 37.8 C (100.0 F) |
| 2015 | 40.6 C (105.1 F) |
| 2016 | 37.8 C (100.0 F) |
| 2017 | 40.0 C (104.0 F) |
| 2018 | 37.2 C (99.0 F) |
| 2019 | 38.3 C (100.9 F) |
| 2020 | 43.3 C (109.9 F) |
| 2021 | 39.4 C (102.9 F) |
| 2022 | 43.3 C (109.9 F) |
| 2023 | 38.3 C (100.9 F) |
| 2024 | 41.1 C (106.0 F) |
| 2025 | 37.8 C (100.0 F) |
| 2026 | 37.8 C (100.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | -1.1 C (30.0 F) |
| 1894 | -6.7 C (19.9 F) |
| 1898 | 8.3 C (46.9 F) |
| 1899 | 0.0 C (32.0 F) |
| 1900 | n/a |
| 1901 | n/a |
| 1902 | n/a |
| 1903 | n/a |
| 1904 | n/a |
| 1905 | -5.0 C (23.0 F) |
| 1906 | -3.3 C (26.1 F) |
| 1907 | -2.2 C (28.0 F) |
| 1909 | n/a |
| 1951 | -3.9 C (25.0 F) |
| 1952 | -5.6 C (21.9 F) |
| 1953 | -3.9 C (25.0 F) |
| 1954 | -6.1 C (21.0 F) |
| 1955 | -5.0 C (23.0 F) |
| 1956 | -5.6 C (21.9 F) |
| 1957 | -5.0 C (23.0 F) |
| 1958 | -3.9 C (25.0 F) |
| 1959 | -5.0 C (23.0 F) |
| 1960 | -6.7 C (19.9 F) |
| 1961 | -5.6 C (21.9 F) |
| 1962 | -5.6 C (21.9 F) |
| 1963 | -6.7 C (19.9 F) |
| 1964 | -4.4 C (24.1 F) |
| 1965 | -5.6 C (21.9 F) |
| 1966 | -4.4 C (24.1 F) |
| 1967 | -4.4 C (24.1 F) |
| 1968 | -6.7 C (19.9 F) |
| 1969 | -3.9 C (25.0 F) |
| 1970 | -5.0 C (23.0 F) |
| 1971 | -3.9 C (25.0 F) |
| 1972 | -8.3 C (17.1 F) |
| 1973 | -5.6 C (21.9 F) |
| 1974 | -3.9 C (25.0 F) |
| 1975 | -6.1 C (21.0 F) |
| 1976 | -5.6 C (21.9 F) |
| 1977 | -3.3 C (26.1 F) |
| 1978 | -5.6 C (21.9 F) |
| 1979 | -4.4 C (24.1 F) |
| 1980 | -5.0 C (23.0 F) |
| 1981 | -1.1 C (30.0 F) |
| 1982 | -3.9 C (25.0 F) |
| 1983 | -1.7 C (28.9 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -7.2 C (19.0 F) |
| 1986 | -1.7 C (28.9 F) |
| 1987 | -3.3 C (26.1 F) |
| 1988 | -3.3 C (26.1 F) |
| 1989 | -6.7 C (19.9 F) |
| 1990 | -10.6 C (12.9 F) |
| 1991 | -6.1 C (21.0 F) |
| 1992 | -2.8 C (27.0 F) |
| 1993 | -3.9 C (25.0 F) |
| 1994 | -3.3 C (26.1 F) |
| 1995 | -1.7 C (28.9 F) |
| 1996 | -2.8 C (27.0 F) |
| 1997 | -4.4 C (24.1 F) |
| 1998 | -6.7 C (19.9 F) |
| 1999 | -2.8 C (27.0 F) |
| 2000 | -2.2 C (28.0 F) |
| 2001 | -2.8 C (27.0 F) |
| 2002 | -3.9 C (25.0 F) |
| 2003 | -3.3 C (26.1 F) |
| 2004 | -2.8 C (27.0 F) |
| 2005 | -1.7 C (28.9 F) |
| 2006 | -4.4 C (24.1 F) |
| 2007 | -4.4 C (24.1 F) |
| 2008 | -3.9 C (25.0 F) |
| 2009 | -5.6 C (21.9 F) |
| 2010 | -2.8 C (27.0 F) |
| 2011 | -3.9 C (25.0 F) |
| 2012 | -5.0 C (23.0 F) |
| 2013 | -6.1 C (21.0 F) |
| 2014 | -1.7 C (28.9 F) |
| 2015 | -4.4 C (24.1 F) |
| 2016 | -3.3 C (26.1 F) |
| 2017 | -3.3 C (26.1 F) |
| 2018 | -3.3 C (26.1 F) |
| 2019 | -2.8 C (27.0 F) |
| 2020 | -1.1 C (30.0 F) |
| 2021 | -1.7 C (28.9 F) |
| 2022 | -3.3 C (26.1 F) |
| 2023 | -3.3 C (26.1 F) |
| 2024 | -1.1 C (30.0 F) |
| 2025 | -1.7 C (28.9 F) |
| 2026 | -1.1 C (30.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 54.1 mm (2.1 in) |
| 1894 | 120.7 mm (4.8 in) |
| 1898 | 23.9 mm (0.9 in) |
| 1899 | 78.5 mm (3.1 in) |
| 1900 | 53.6 mm (2.1 in) |
| 1901 | 46.5 mm (1.8 in) |
| 1902 | 64.0 mm (2.5 in) |
| 1903 | 67.1 mm (2.6 in) |
| 1904 | 69.9 mm (2.8 in) |
| 1905 | 45.2 mm (1.8 in) |
| 1906 | 42.9 mm (1.7 in) |
| 1907 | 85.1 mm (3.4 in) |
| 1909 | 70.1 mm (2.8 in) |
| 1951 | 74.2 mm (2.9 in) |
| 1952 | 52.1 mm (2.1 in) |
| 1953 | 71.1 mm (2.8 in) |
| 1954 | 47.0 mm (1.9 in) |
| 1955 | 85.6 mm (3.4 in) |
| 1956 | 56.6 mm (2.2 in) |
| 1957 | 63.5 mm (2.5 in) |
| 1958 | 63.5 mm (2.5 in) |
| 1959 | 68.6 mm (2.7 in) |
| 1960 | 53.3 mm (2.1 in) |
| 1961 | 44.7 mm (1.8 in) |
| 1962 | 111.3 mm (4.4 in) |
| 1963 | 82.0 mm (3.2 in) |
| 1964 | 44.2 mm (1.7 in) |
| 1965 | 42.2 mm (1.7 in) |
| 1966 | 94.0 mm (3.7 in) |
| 1967 | 83.8 mm (3.3 in) |
| 1968 | 55.9 mm (2.2 in) |
| 1969 | 48.0 mm (1.9 in) |
| 1970 | 95.0 mm (3.7 in) |
| 1971 | 29.7 mm (1.2 in) |
| 1972 | 34.8 mm (1.4 in) |
| 1973 | 72.6 mm (2.9 in) |
| 1974 | 49.5 mm (1.9 in) |
| 1975 | 48.3 mm (1.9 in) |
| 1976 | 36.8 mm (1.4 in) |
| 1977 | 137.2 mm (5.4 in) |
| 1978 | 59.9 mm (2.4 in) |
| 1979 | 146.1 mm (5.8 in) |
| 1980 | 64.8 mm (2.6 in) |
| 1981 | 86.9 mm (3.4 in) |
| 1982 | 171.5 mm (6.8 in) |
| 1983 | 82.6 mm (3.3 in) |
| 1984 | 36.8 mm (1.4 in) |
| 1985 | 56.6 mm (2.2 in) |
| 1986 | 100.1 mm (3.9 in) |
| 1987 | 63.5 mm (2.5 in) |
| 1988 | 33.8 mm (1.3 in) |
| 1989 | 55.1 mm (2.2 in) |
| 1990 | 41.7 mm (1.6 in) |
| 1991 | 70.1 mm (2.8 in) |
| 1992 | 72.4 mm (2.9 in) |
| 1993 | 70.1 mm (2.8 in) |
| 1994 | 50.8 mm (2.0 in) |
| 1995 | 108.7 mm (4.3 in) |
| 1996 | 78.7 mm (3.1 in) |
| 1997 | 61.5 mm (2.4 in) |
| 1998 | 96.5 mm (3.8 in) |
| 1999 | 67.3 mm (2.6 in) |
| 2000 | 62.2 mm (2.4 in) |
| 2001 | 72.1 mm (2.8 in) |
| 2002 | 66.0 mm (2.6 in) |
| 2003 | 33.0 mm (1.3 in) |
| 2004 | 96.5 mm (3.8 in) |
| 2005 | 110.7 mm (4.4 in) |
| 2006 | 50.0 mm (2.0 in) |
| 2007 | 29.7 mm (1.2 in) |
| 2008 | 64.8 mm (2.6 in) |
| 2009 | 50.3 mm (2.0 in) |
| 2010 | 78.7 mm (3.1 in) |
| 2011 | 31.2 mm (1.2 in) |
| 2012 | 43.2 mm (1.7 in) |
| 2013 | 22.1 mm (0.9 in) |
| 2014 | 95.3 mm (3.8 in) |
| 2015 | 44.5 mm (1.8 in) |
| 2016 | 50.5 mm (2.0 in) |
| 2017 | 54.9 mm (2.2 in) |
| 2018 | 50.8 mm (2.0 in) |
| 2019 | 50.8 mm (2.0 in) |
| 2020 | 23.6 mm (0.9 in) |
| 2021 | 58.4 mm (2.3 in) |
| 2022 | 52.1 mm (2.1 in) |
| 2023 | 48.3 mm (1.9 in) |
| 2024 | 50.8 mm (2.0 in) |
| 2025 | 56.4 mm (2.2 in) |
| 2026 | 50.8 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 111.2 mm (4.4 in) |
| 1894 | 149.9 mm (5.9 in) |
| 1898 | 35.1 mm (1.4 in) |
| 1899 | 113.3 mm (4.5 in) |
| 1900 | 104.4 mm (4.1 in) |
| 1901 | 77.0 mm (3.0 in) |
| 1902 | 162.0 mm (6.4 in) |
| 1903 | 106.2 mm (4.2 in) |
| 1904 | 104.2 mm (4.1 in) |
| 1905 | 71.8 mm (2.8 in) |
| 1906 | 140.2 mm (5.5 in) |
| 1907 | 141.7 mm (5.6 in) |
| 1909 | 136.7 mm (5.4 in) |
| 1951 | 138.2 mm (5.4 in) |
| 1952 | 157.4 mm (6.2 in) |
| 1953 | 85.6 mm (3.4 in) |
| 1954 | 91.1 mm (3.6 in) |
| 1955 | 236.0 mm (9.3 in) |
| 1956 | 122.4 mm (4.8 in) |
| 1957 | 117.7 mm (4.6 in) |
| 1958 | 146.3 mm (5.8 in) |
| 1959 | 113.8 mm (4.5 in) |
| 1960 | 112.5 mm (4.4 in) |
| 1961 | 125.8 mm (5.0 in) |
| 1962 | 231.7 mm (9.1 in) |
| 1963 | 159.5 mm (6.3 in) |
| 1964 | 129.8 mm (5.1 in) |
| 1965 | 105.0 mm (4.1 in) |
| 1966 | 137.4 mm (5.4 in) |
| 1967 | 204.5 mm (8.1 in) |
| 1968 | 110.5 mm (4.4 in) |
| 1969 | 120.4 mm (4.7 in) |
| 1970 | 174.5 mm (6.9 in) |
| 1971 | 65.6 mm (2.6 in) |
| 1972 | 103.4 mm (4.1 in) |
| 1973 | 203.6 mm (8.0 in) |
| 1974 | 116.6 mm (4.6 in) |
| 1975 | 126.0 mm (5.0 in) |
| 1976 | 66.0 mm (2.6 in) |
| 1977 | 180.4 mm (7.1 in) |
| 1978 | 155.1 mm (6.1 in) |
| 1979 | 217.9 mm (8.6 in) |
| 1980 | 176.2 mm (6.9 in) |
| 1981 | 153.9 mm (6.1 in) |
| 1982 | 231.7 mm (9.1 in) |
| 1983 | 176.4 mm (6.9 in) |
| 1984 | 90.2 mm (3.6 in) |
| 1985 | 79.8 mm (3.1 in) |
| 1986 | 298.7 mm (11.8 in) |
| 1987 | 106.4 mm (4.2 in) |
| 1988 | 65.0 mm (2.6 in) |
| 1989 | 76.2 mm (3.0 in) |
| 1990 | 88.7 mm (3.5 in) |
| 1991 | 141.7 mm (5.6 in) |
| 1992 | 142.4 mm (5.6 in) |
| 1993 | 109.9 mm (4.3 in) |
| 1994 | 115.1 mm (4.5 in) |
| 1995 | 231.7 mm (9.1 in) |
| 1996 | 122.5 mm (4.8 in) |
| 1997 | 160.9 mm (6.3 in) |
| 1998 | 221.2 mm (8.7 in) |
| 1999 | 160.3 mm (6.3 in) |
| 2000 | 160.0 mm (6.3 in) |
| 2001 | 127.5 mm (5.0 in) |
| 2002 | 106.5 mm (4.2 in) |
| 2003 | 51.3 mm (2.0 in) |
| 2004 | 163.2 mm (6.4 in) |
| 2005 | 190.4 mm (7.5 in) |
| 2006 | 102.3 mm (4.0 in) |
| 2007 | 90.1 mm (3.5 in) |
| 2008 | 109.9 mm (4.3 in) |
| 2009 | 138.8 mm (5.5 in) |
| 2010 | 154.0 mm (6.1 in) |
| 2011 | 76.3 mm (3.0 in) |
| 2012 | 124.7 mm (4.9 in) |
| 2013 | 24.6 mm (1.0 in) |
| 2014 | 161.6 mm (6.4 in) |
| 2015 | 68.7 mm (2.7 in) |
| 2016 | 92.7 mm (3.6 in) |
| 2017 | 108.5 mm (4.3 in) |
| 2018 | 85.6 mm (3.4 in) |
| 2019 | 104.1 mm (4.1 in) |
| 2020 | 33.3 mm (1.3 in) |
| 2021 | 68.6 mm (2.7 in) |
| 2022 | 126.2 mm (5.0 in) |
| 2023 | 107.2 mm (4.2 in) |
| 2024 | 92.5 mm (3.6 in) |
| 2025 | 113.5 mm (4.5 in) |
| 2026 | 85.4 mm (3.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 67 days |
| 1894 | 15 days |
| 1898 | 31 days |
| 1899 | 63 days |
| 1900 | 35 days |
| 1901 | 95 days |
| 1902 | 70 days |
| 1903 | 175 days |
| 1904 | 78 days |
| 1905 | 175 days |
| 1906 | 103 days |
| 1907 | 33 days |
| 1909 | 16 days |
| 1951 | 13 days |
| 1952 | 72 days |
| 1953 | 82 days |
| 1954 | 45 days |
| 1955 | 136 days |
| 1956 | 136 days |
| 1957 | 109 days |
| 1958 | 129 days |
| 1959 | 92 days |
| 1960 | 154 days |
| 1961 | 58 days |
| 1962 | 152 days |
| 1963 | 152 days |
| 1964 | 90 days |
| 1965 | 112 days |
| 1966 | 53 days |
| 1967 | 120 days |
| 1968 | 85 days |
| 1969 | 122 days |
| 1970 | 130 days |
| 1971 | 124 days |
| 1972 | 108 days |
| 1973 | 118 days |
| 1974 | 109 days |
| 1975 | 50 days |
| 1976 | 123 days |
| 1977 | 113 days |
| 1978 | 116 days |
| 1979 | 144 days |
| 1980 | 101 days |
| 1981 | 129 days |
| 1982 | 75 days |
| 1983 | 105 days |
| 1984 | 84 days |
| 1985 | 41 days |
| 1986 | 131 days |
| 1987 | 166 days |
| 1988 | 128 days |
| 1989 | 103 days |
| 1990 | 114 days |
| 1991 | 72 days |
| 1992 | 92 days |
| 1993 | 74 days |
| 1994 | 119 days |
| 1995 | 137 days |
| 1996 | 116 days |
| 1997 | 75 days |
| 1998 | 110 days |
| 1999 | 129 days |
| 2000 | 85 days |
| 2001 | 75 days |
| 2002 | 169 days |
| 2003 | 181 days |
| 2004 | 113 days |
| 2005 | 131 days |
| 2006 | 135 days |
| 2007 | 140 days |
| 2008 | 132 days |
| 2009 | 102 days |
| 2010 | 119 days |
| 2011 | 92 days |
| 2012 | 113 days |
| 2013 | 87 days |
| 2014 | 150 days |
| 2015 | 144 days |
| 2016 | 147 days |
| 2017 | 80 days |
| 2018 | 89 days |
| 2019 | 110 days |
| 2020 | 51 days |
| 2021 | 58 days |
| 2022 | 56 days |
| 2023 | 142 days |
| 2024 | 178 days |
| 2025 | 140 days |
| 2026 | 95 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
60 years with a frostAcross 60 years with a frost, the median last spring frost at Sonoma falls on 20 March and the median first autumn frost on 20 November, which leaves a median of 241 days between them.
In 1990 to 2025 the median growing season was 268 days. That is 54 days more than in 1953 to 1989.
Fitted over all years, the growing season changes by +12.9 days per decade at this station.
| Measure | Median, all years | Earliest period (1953 to 1989) | Recent period (1990 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 20 March | 8 April | 4 March | 35 days earlier | -8.3 days per decade |
| First autumn frost | 20 November | 13 November | 27 November | 14 days later | +4.6 days per decade |
| Growing days | 241 days | 214 days | 268 days | 54 days more | +12.9 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
76 years, 1893 to 2025A day with at least 59.5 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 159.2 mm (6.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 59.5 mm (2.3 in) | |
| 5 years | 82.8 mm (3.3 in) | |
| 10 years | 99.5 mm (3.9 in) | |
| 25 years | 122.2 mm (4.8 in) | |
| 50 years | 140.2 mm (5.5 in) | |
| 100 years | 159.2 mm (6.3 in) | Longer than the 76 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, 76 years of values from 1893 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: 171.5 mm (6.8 in) in 1982; 146.1 mm (5.8 in) in 1979; 137.2 mm (5.4 in) in 1977.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Sonoma, at 1972 and 1992. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1972 ran 0.3 C (0.6 F) higher than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1992 ran 0.5 C (1.0 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1972 | +0.3 | +0.6 | possible | 5 |
| 1992 | -0.5 | -1.0 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2008 to 2025 against 1961 to 1990Over 2008 to 2025, Sonoma had a mean temperature of 15.4 C (59.7 F) and 544.4 mm (21.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Gilroy (United States, 165 km away), Los Gatos (United States, 127 km away) and San Jose (United States, 115 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Gilroy | United States | 165 km (103 mi) | 15.2 C (59.3 F) | 535.9 mm (21.1 in) | 0.49 |
| Los Gatos | United States | 127 km (79 mi) | 15.0 C (58.9 F) | 571.3 mm (22.5 in) | 0.55 |
| San Jose | United States | 115 km (71 mi) | 15.5 C (60.0 F) | 364.4 mm (14.3 in) | 0.93 |
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).