Grass Valley #2 Weather Records (USC00043573)
Record envelope, standing records and threshold days for Grass Valley #2 (USC00043573), California, United States, with 61 years of record.
Key Facts for Grass Valley #2
- Grass Valley #2 (USC00043573) is a weather station in California, United States at 39.20 latitude and -121.07 longitude, 732 m (2,400 ft) above sea level.
- The station reports from 1966 to 2026, 61 years of record.
- 1,464 records set at Grass Valley #2 still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Grass Valley #2 set a daily record high minimum temperature of 14.4 C (57.9 F) on 10 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, 39.20 latitude, -121.07 longitude.
- Elevation: 732 m (2,400 ft).
- Period of record: 1966 to 2026, 61 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
9 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 25.0 C (77.0 F) | -9.4 C (15.1 F) | 23.3 C (73.9 F) | -2.8 C (27.0 F) |
| Feb | 27.2 C (81.0 F) | -12.8 C (9.0 F) | 22.8 C (73.0 F) | -1.7 C (28.9 F) |
| Mar | 29.4 C (84.9 F) | -7.2 C (19.0 F) | 29.4 C (84.9 F) | -0.6 C (30.9 F) |
| Apr | 31.1 C (88.0 F) | -3.3 C (26.1 F) | 24.4 C (75.9 F) | 1.1 C (34.0 F) |
| May | 37.2 C (99.0 F) | -2.8 C (27.0 F) | 29.4 C (84.9 F) | 4.4 C (39.9 F) |
| Jun | 38.9 C (102.0 F) | 2.2 C (36.0 F) | 34.4 C (93.9 F) | 9.4 C (48.9 F) |
| Jul | 42.2 C (108.0 F) | 4.4 C (39.9 F) | 35.0 C (95.0 F) | 11.7 C (53.1 F) |
| Aug | 42.2 C (108.0 F) | 5.0 C (41.0 F) | 37.2 C (99.0 F) | 11.7 C (53.1 F) |
| Sep | 42.2 C (108.0 F) | 1.7 C (35.1 F) | 34.4 C (93.9 F) | 7.2 C (45.0 F) |
| Oct | 36.7 C (98.1 F) | -2.8 C (27.0 F) | 34.4 C (93.9 F) | 5.0 C (41.0 F) |
| Nov | 30.6 C (87.1 F) | -7.2 C (19.0 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -16.1 C (3.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1966 | 8 |
| 1967 | 49 |
| 1968 | 36 |
| 1969 | 26 |
| 1970 | 25 |
| 1971 | 52 |
| 1972 | 50 |
| 1973 | 24 |
| 1974 | 29 |
| 1975 | 40 |
| 1976 | 37 |
| 1977 | 29 |
| 1978 | 37 |
| 1979 | 21 |
| 1980 | 21 |
| 1981 | 14 |
| 1982 | 25 |
| 1983 | 29 |
| 1984 | 27 |
| 1985 | 49 |
| 1986 | 27 |
| 1987 | 41 |
| 1988 | 29 |
| 1989 | 38 |
| 1990 | 30 |
| 1991 | 17 |
| 1992 | 13 |
| 1993 | 10 |
| 1994 | 11 |
| 1995 | 22 |
| 1996 | 26 |
| 1997 | 16 |
| 1998 | 24 |
| 1999 | 16 |
| 2000 | 22 |
| 2001 | 16 |
| 2002 | 14 |
| 2003 | 22 |
| 2004 | 13 |
| 2005 | 14 |
| 2006 | 10 |
| 2007 | 13 |
| 2008 | 30 |
| 2009 | 23 |
| 2010 | 20 |
| 2011 | 26 |
| 2012 | 16 |
| 2013 | 17 |
| 2014 | 9 |
| 2015 | 21 |
| 2016 | 10 |
| 2017 | 43 |
| 2018 | 9 |
| 2019 | 19 |
| 2020 | 18 |
| 2021 | 23 |
| 2022 | 26 |
| 2023 | 20 |
| 2024 | 34 |
| 2025 | 14 |
| 2026 | 14 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 2003-07-30 | Record high minimum temperature | Record high minimum temperature 21.7 C (71.1 F) |
| 2005-12-31 | Record daily precipitation | Record daily precipitation 178.3 mm (7.0 in) |
| 2013-07-02 | Record high minimum temperature | Record high minimum temperature 22.2 C (72.0 F) |
| 2020-08-17 | Record high minimum temperature | Record high minimum temperature 25.6 C (78.1 F) |
| 2021-10-25 | Record daily precipitation | Record daily precipitation 229.9 mm (9.1 in) |
Wettest Day of Each Month
Oct: 229.9 mm (9.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 160.3 mm (6.3 in) | 2 January 1997 |
| Feb | 176.5 mm (6.9 in) | 9 February 2014 |
| Mar | 125.0 mm (4.9 in) | 13 March 1983 |
| Apr | 91.2 mm (3.6 in) | 7 April 2018 |
| May | 91.7 mm (3.6 in) | 16 May 1996 |
| Jun | 43.2 mm (1.7 in) | 5 June 2012 |
| Jul | 66.5 mm (2.6 in) | 9 July 1974 |
| Aug | 46.2 mm (1.8 in) | 15 August 1976 |
| Sep | 53.1 mm (2.1 in) | 27 September 1986 |
| Oct | 229.9 mm (9.1 in) | 25 October 2021 |
| Nov | 139.4 mm (5.5 in) | 23 November 1988 |
| Dec | 178.3 mm (7.0 in) | 31 December 2005 |
Period of Record Coverage
1966 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1966 | 92 | 25% | No |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 363 | 99% | Yes |
| 1983 | 363 | 99% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 363 | 99% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 364 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 335 | 92% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 334 | 92% | Yes |
| 2006 | 243 | 67% | No |
| 2007 | 273 | 75% | No |
| 2008 | 366 | 100% | Yes |
| 2009 | 362 | 99% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 363 | 99% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 362 | 99% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 361 | 99% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 October 2026 | Grass Valley #2, US | daily high min (Provisional) | 14.4 C (57.9 F) | 1.6 C (2.9 F) | 32 years | 20 of 100 (Routine) |
| 10 October 2026 | Grass Valley #2, US | daily high max (Provisional) | 33.9 C (93.0 F) | 0.6 C (1.1 F) | 1 year | 7 of 100 (Routine) |
| 9 October 2026 | Grass Valley #2, US | daily high min (Provisional) | 14.4 C (57.9 F) | 1.6 C (2.9 F) | 1 year | 11 of 100 (Routine) |
| 8 October 2026 | Grass Valley #2, US | daily high min (Tie, Provisional) | 13.9 C (57.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 6 October 2026 | Grass Valley #2, US | daily high min (Provisional) | 14.4 C (57.9 F) | 0.5 C (0.9 F) | 1 year | 7 of 100 (Routine) |
| 5 October 2026 | Grass Valley #2, US | daily high min (Provisional) | 13.9 C (57.0 F) | 1.1 C (2.0 F) | 1 year | 9 of 100 (Routine) |
| 4 October 2026 | Grass Valley #2, US | daily high max (Provisional) | 34.4 C (93.9 F) | 0.5 C (0.9 F) | 39 years | 17 of 100 (Routine) |
| 4 October 2026 | Grass Valley #2, US | daily high min (Provisional) | 13.3 C (55.9 F) | 0.5 C (0.9 F) | 8 years | 9 of 100 (Routine) |
| 4 September 2026 | Grass Valley #2, US | daily rain (Provisional) | 20.1 mm (0.8 in) | 19.3 mm (0.8 in) | 3 years | 20 of 100 (Routine) |
| 4 September 2026 | Grass Valley #2, US | daily low max (Provisional) | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 25 years | 15 of 100 (Routine) |
| 9 August 2026 | Grass Valley #2, US | daily high min | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 53 years | 24 of 100 (Routine) |
| 17 June 2026 | Grass Valley #2, US | daily high min | 17.8 C (64.0 F) | 1.7 C (3.1 F) | 23 years | 17 of 100 (Routine) |
| 16 June 2026 | Grass Valley #2, US | daily high min | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 25 years | 16 of 100 (Routine) |
| 15 June 2026 | Grass Valley #2, US | daily high min | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 51 years | 24 of 100 (Routine) |
| 14 June 2026 | Grass Valley #2, US | daily high min (Tie) | 16.1 C (61.0 F) | tie | 51 years | 5 of 100 (Routine) |
| 10 May 2026 | Grass Valley #2, US | daily high min (Tie) | 12.8 C (55.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 22 April 2026 | Grass Valley #2, US | daily rain | 25.9 mm (1.0 in) | 11.7 mm (0.5 in) | 36 years | 25 of 100 (Routine) |
| 21 April 2026 | Grass Valley #2, US | daily rain | 43.2 mm (1.7 in) | 15.5 mm (0.6 in) | 4 years | 18 of 100 (Routine) |
| 12 April 2026 | Grass Valley #2, US | daily rain | 68.6 mm (2.7 in) | 22.1 mm (0.9 in) | 13 years | 25 of 100 (Routine) |
| 10 April 2026 | Grass Valley #2, US | daily high min | 9.4 C (48.9 F) | 0.5 C (0.9 F) | 9 years | 9 of 100 (Routine) |
Climate Trend
55 complete years, 1967 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1967 | 13.2 C | -0.12 C |
| 1968 | 13.1 C | -0.14 C |
| 1969 | 13.1 C | -0.13 C |
| 1970 | 13.6 C | +0.33 C |
| 1971 | 12.6 C | -0.69 C |
| 1972 | 13.0 C | -0.28 C |
| 1973 | 13.1 C | -0.21 C |
| 1974 | 13.3 C | +0.05 C |
| 1975 | 12.6 C | -0.69 C |
| 1976 | 12.7 C | -0.61 C |
| 1977 | 12.8 C | -0.44 C |
| 1978 | 12.4 C | -0.88 C |
| 1979 | 12.5 C | -0.75 C |
| 1980 | 12.6 C | -0.67 C |
| 1981 | 13.3 C | +0.06 C |
| 1982 | 11.6 C | -1.66 C |
| 1983 | 12.4 C | -0.88 C |
| 1984 | 12.6 C | -0.65 C |
| 1985 | 12.3 C | -0.97 C |
| 1986 | 13.4 C | +0.11 C |
| 1987 | 13.0 C | -0.24 C |
| 1988 | 13.5 C | +0.18 C |
| 1989 | 12.6 C | -0.68 C |
| 1990 | 13.0 C | -0.30 C |
| 1991 | 13.3 C | +0.03 C |
| 1992 | 14.0 C | +0.70 C |
| 1993 | 12.8 C | -0.48 C |
| 1994 | 12.7 C | -0.53 C |
| 1995 | 13.3 C | +0.06 C |
| 1996 | 13.7 C | +0.44 C |
| 1997 | 13.6 C | +0.32 C |
| 1998 | 12.1 C | -1.16 C |
| 1999 | 13.0 C | -0.28 C |
| 2001 | 13.7 C | +0.41 C |
| 2002 | 13.4 C | +0.16 C |
| 2003 | 13.5 C | +0.18 C |
| 2004 | 13.5 C | +0.21 C |
| 2008 | 13.5 C | +0.22 C |
| 2009 | 13.4 C | +0.12 C |
| 2010 | 12.7 C | -0.58 C |
| 2011 | 12.4 C | -0.83 C |
| 2012 | 13.6 C | +0.33 C |
| 2013 | 13.8 C | +0.51 C |
| 2014 | 14.8 C | +1.49 C |
| 2015 | 14.6 C | +1.37 C |
| 2016 | 14.0 C | +0.69 C |
| 2017 | 14.2 C | +0.90 C |
| 2018 | 14.1 C | +0.78 C |
| 2019 | 13.3 C | -0.02 C |
| 2020 | 14.5 C | +1.23 C |
| 2021 | 14.5 C | +1.23 C |
| 2022 | 14.1 C | +0.81 C |
| 2023 | 13.2 C | -0.08 C |
| 2024 | 14.4 C | +1.16 C |
| 2025 | 14.2 C | +0.93 C |
The annual mean temperature here has risen by 0.2 C (0.2 to 0.3) per decade over 1967 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 55 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 (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.6) per decade | 1967 to 2025 | 55 | Rise |
| Mean daily maximum | 0.14 C (0.02 to 0.26) per decade | 0.25 F (0.04 to 0.47) per decade | 1967 to 2025 | 55 | Rise |
| Mean daily minimum | 0.3 C (0.2 to 0.4) per decade | 0.6 F (0.4 to 0.8) per decade | 1967 to 2025 | 55 | 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
1966 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.2 C (108.0 F) | 1971 | 37.8 C (100.0 F) | 61 |
| Coldest night (TNn) | -16.1 C (3.0 F) | 1972 | -6.1 C (21.0 F) | 61 |
| Wettest day (Rx1day) | 229.9 mm (9.1 in) | 2021 | 95.5 mm (3.8 in) | 61 |
| Wettest five days (Rx5day) | 481.6 mm (19.0 in) | 1986 | 206.4 mm (8.1 in) | 61 |
| Longest dry spell (CDD) | 168 days | 2002 | 89 days | 61 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1966 | 31.7 C (89.1 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 38.3 C (100.9 F) |
| 1969 | 38.9 C (102.0 F) |
| 1970 | 38.9 C (102.0 F) |
| 1971 | 42.2 C (108.0 F) |
| 1972 | 42.2 C (108.0 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 36.1 C (97.0 F) |
| 1975 | 38.9 C (102.0 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 36.1 C (97.0 F) |
| 1978 | 40.0 C (104.0 F) |
| 1979 | 37.2 C (99.0 F) |
| 1980 | 37.2 C (99.0 F) |
| 1981 | 37.8 C (100.0 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 36.7 C (98.1 F) |
| 1984 | 37.2 C (99.0 F) |
| 1985 | 36.1 C (97.0 F) |
| 1986 | 36.7 C (98.1 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 36.1 C (97.0 F) |
| 1993 | 36.1 C (97.0 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 38.3 C (100.9 F) |
| 1997 | 38.3 C (100.9 F) |
| 1998 | 39.4 C (102.9 F) |
| 1999 | 37.2 C (99.0 F) |
| 2000 | 37.8 C (100.0 F) |
| 2001 | 37.2 C (99.0 F) |
| 2002 | 40.0 C (104.0 F) |
| 2003 | 37.8 C (100.0 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 37.8 C (100.0 F) |
| 2006 | 33.9 C (93.0 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 39.4 C (102.9 F) |
| 2009 | 37.2 C (99.0 F) |
| 2010 | 38.3 C (100.9 F) |
| 2011 | 35.6 C (96.1 F) |
| 2012 | 37.2 C (99.0 F) |
| 2013 | 37.8 C (100.0 F) |
| 2014 | 36.7 C (98.1 F) |
| 2015 | 37.2 C (99.0 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 38.9 C (102.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 40.0 C (104.0 F) |
| 2020 | 38.3 C (100.9 F) |
| 2021 | 40.6 C (105.1 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 38.3 C (100.9 F) |
| 2024 | 41.1 C (106.0 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 37.2 C (99.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1966 | -5.6 C (21.9 F) |
| 1967 | -8.3 C (17.1 F) |
| 1968 | -7.8 C (18.0 F) |
| 1969 | -8.3 C (17.1 F) |
| 1970 | -7.2 C (19.0 F) |
| 1971 | -6.7 C (19.9 F) |
| 1972 | -16.1 C (3.0 F) |
| 1973 | -7.2 C (19.0 F) |
| 1974 | -7.8 C (18.0 F) |
| 1975 | -6.7 C (19.9 F) |
| 1976 | -6.1 C (21.0 F) |
| 1977 | -7.2 C (19.0 F) |
| 1978 | -9.4 C (15.1 F) |
| 1979 | -9.4 C (15.1 F) |
| 1980 | -5.0 C (23.0 F) |
| 1981 | -3.3 C (26.1 F) |
| 1982 | -7.8 C (18.0 F) |
| 1983 | -4.4 C (24.1 F) |
| 1984 | -7.2 C (19.0 F) |
| 1985 | -7.8 C (18.0 F) |
| 1986 | -3.9 C (25.0 F) |
| 1987 | -6.7 C (19.9 F) |
| 1988 | -7.8 C (18.0 F) |
| 1989 | -12.8 C (9.0 F) |
| 1990 | -11.7 C (10.9 F) |
| 1991 | -5.0 C (23.0 F) |
| 1992 | -5.6 C (21.9 F) |
| 1993 | -6.7 C (19.9 F) |
| 1994 | -5.0 C (23.0 F) |
| 1995 | -3.3 C (26.1 F) |
| 1996 | -5.0 C (23.0 F) |
| 1997 | -7.2 C (19.0 F) |
| 1998 | -9.4 C (15.1 F) |
| 1999 | -3.9 C (25.0 F) |
| 2000 | -3.3 C (26.1 F) |
| 2001 | -5.6 C (21.9 F) |
| 2002 | -7.8 C (18.0 F) |
| 2003 | -4.4 C (24.1 F) |
| 2004 | -4.4 C (24.1 F) |
| 2005 | -2.8 C (27.0 F) |
| 2006 | -5.6 C (21.9 F) |
| 2007 | -7.8 C (18.0 F) |
| 2008 | -6.1 C (21.0 F) |
| 2009 | -8.9 C (16.0 F) |
| 2010 | -5.6 C (21.9 F) |
| 2011 | -6.1 C (21.0 F) |
| 2012 | -7.2 C (19.0 F) |
| 2013 | -9.4 C (15.1 F) |
| 2014 | -5.6 C (21.9 F) |
| 2015 | -5.0 C (23.0 F) |
| 2016 | -5.0 C (23.0 F) |
| 2017 | -3.3 C (26.1 F) |
| 2018 | -6.7 C (19.9 F) |
| 2019 | -5.0 C (23.0 F) |
| 2020 | -4.4 C (24.1 F) |
| 2021 | -3.9 C (25.0 F) |
| 2022 | -5.6 C (21.9 F) |
| 2023 | -5.0 C (23.0 F) |
| 2024 | -3.9 C (25.0 F) |
| 2025 | -3.9 C (25.0 F) |
| 2026 | -2.8 C (27.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1966 | 80.0 mm (3.1 in) |
| 1967 | 116.8 mm (4.6 in) |
| 1968 | 73.7 mm (2.9 in) |
| 1969 | 115.3 mm (4.5 in) |
| 1970 | 115.8 mm (4.6 in) |
| 1971 | 94.2 mm (3.7 in) |
| 1972 | 65.3 mm (2.6 in) |
| 1973 | 107.7 mm (4.2 in) |
| 1974 | 67.3 mm (2.6 in) |
| 1975 | 122.2 mm (4.8 in) |
| 1976 | 46.2 mm (1.8 in) |
| 1977 | 92.7 mm (3.6 in) |
| 1978 | 99.8 mm (3.9 in) |
| 1979 | 90.2 mm (3.6 in) |
| 1980 | 102.1 mm (4.0 in) |
| 1981 | 134.9 mm (5.3 in) |
| 1982 | 117.3 mm (4.6 in) |
| 1983 | 125.0 mm (4.9 in) |
| 1984 | 45.5 mm (1.8 in) |
| 1985 | 122.2 mm (4.8 in) |
| 1986 | 172.0 mm (6.8 in) |
| 1987 | 90.2 mm (3.6 in) |
| 1988 | 139.4 mm (5.5 in) |
| 1989 | 87.4 mm (3.4 in) |
| 1990 | 86.1 mm (3.4 in) |
| 1991 | 109.7 mm (4.3 in) |
| 1992 | 99.8 mm (3.9 in) |
| 1993 | 84.3 mm (3.3 in) |
| 1994 | 111.3 mm (4.4 in) |
| 1995 | 112.5 mm (4.4 in) |
| 1996 | 120.1 mm (4.7 in) |
| 1997 | 160.3 mm (6.3 in) |
| 1998 | 81.5 mm (3.2 in) |
| 1999 | 94.5 mm (3.7 in) |
| 2000 | 106.2 mm (4.2 in) |
| 2001 | 63.5 mm (2.5 in) |
| 2002 | 98.0 mm (3.9 in) |
| 2003 | 72.1 mm (2.8 in) |
| 2004 | 61.2 mm (2.4 in) |
| 2005 | 178.3 mm (7.0 in) |
| 2006 | 64.3 mm (2.5 in) |
| 2007 | 77.0 mm (3.0 in) |
| 2008 | 70.4 mm (2.8 in) |
| 2009 | 59.7 mm (2.4 in) |
| 2010 | 103.9 mm (4.1 in) |
| 2011 | 85.3 mm (3.4 in) |
| 2012 | 106.4 mm (4.2 in) |
| 2013 | 36.1 mm (1.4 in) |
| 2014 | 176.5 mm (6.9 in) |
| 2015 | 92.7 mm (3.6 in) |
| 2016 | 106.4 mm (4.2 in) |
| 2017 | 119.9 mm (4.7 in) |
| 2018 | 91.2 mm (3.6 in) |
| 2019 | 95.5 mm (3.8 in) |
| 2020 | 73.4 mm (2.9 in) |
| 2021 | 229.9 mm (9.1 in) |
| 2022 | 106.7 mm (4.2 in) |
| 2023 | 68.8 mm (2.7 in) |
| 2024 | 102.4 mm (4.0 in) |
| 2025 | 88.6 mm (3.5 in) |
| 2026 | 68.6 mm (2.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1966 | 181.7 mm (7.2 in) |
| 1967 | 254.8 mm (10.0 in) |
| 1968 | 151.5 mm (6.0 in) |
| 1969 | 312.1 mm (12.3 in) |
| 1970 | 244.2 mm (9.6 in) |
| 1971 | 179.7 mm (7.1 in) |
| 1972 | 116.6 mm (4.6 in) |
| 1973 | 214.9 mm (8.5 in) |
| 1974 | 182.9 mm (7.2 in) |
| 1975 | 187.9 mm (7.4 in) |
| 1976 | 63.5 mm (2.5 in) |
| 1977 | 127.0 mm (5.0 in) |
| 1978 | 261.9 mm (10.3 in) |
| 1979 | 193.6 mm (7.6 in) |
| 1980 | 247.6 mm (9.7 in) |
| 1981 | 247.6 mm (9.7 in) |
| 1982 | 231.1 mm (9.1 in) |
| 1983 | 207.4 mm (8.2 in) |
| 1984 | 104.6 mm (4.1 in) |
| 1985 | 149.9 mm (5.9 in) |
| 1986 | 481.6 mm (19.0 in) |
| 1987 | 135.6 mm (5.3 in) |
| 1988 | 187.4 mm (7.4 in) |
| 1989 | 202.7 mm (8.0 in) |
| 1990 | 134.4 mm (5.3 in) |
| 1991 | 222.6 mm (8.8 in) |
| 1992 | 212.4 mm (8.4 in) |
| 1993 | 185.4 mm (7.3 in) |
| 1994 | 187.9 mm (7.4 in) |
| 1995 | 299.0 mm (11.8 in) |
| 1996 | 238.9 mm (9.4 in) |
| 1997 | 389.8 mm (15.3 in) |
| 1998 | 213.3 mm (8.4 in) |
| 1999 | 212.7 mm (8.4 in) |
| 2000 | 268.3 mm (10.6 in) |
| 2001 | 148.6 mm (5.9 in) |
| 2002 | 263.8 mm (10.4 in) |
| 2003 | 126.0 mm (5.0 in) |
| 2004 | 140.3 mm (5.5 in) |
| 2005 | 276.8 mm (10.9 in) |
| 2006 | 289.0 mm (11.4 in) |
| 2007 | 206.8 mm (8.1 in) |
| 2008 | 118.9 mm (4.7 in) |
| 2009 | 139.7 mm (5.5 in) |
| 2010 | 200.2 mm (7.9 in) |
| 2011 | 161.0 mm (6.3 in) |
| 2012 | 319.8 mm (12.6 in) |
| 2013 | 49.6 mm (2.0 in) |
| 2014 | 309.0 mm (12.2 in) |
| 2015 | 170.1 mm (6.7 in) |
| 2016 | 206.4 mm (8.1 in) |
| 2017 | 366.1 mm (14.4 in) |
| 2018 | 147.6 mm (5.8 in) |
| 2019 | 201.2 mm (7.9 in) |
| 2020 | 133.3 mm (5.2 in) |
| 2021 | 360.2 mm (14.2 in) |
| 2022 | 245.7 mm (9.7 in) |
| 2023 | 258.6 mm (10.2 in) |
| 2024 | 234.2 mm (9.2 in) |
| 2025 | 255.0 mm (10.0 in) |
| 2026 | 154.7 mm (6.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1966 | 36 days |
| 1967 | 96 days |
| 1968 | 73 days |
| 1969 | 118 days |
| 1970 | 112 days |
| 1971 | 64 days |
| 1972 | 86 days |
| 1973 | 110 days |
| 1974 | 83 days |
| 1975 | 50 days |
| 1976 | 65 days |
| 1977 | 54 days |
| 1978 | 68 days |
| 1979 | 73 days |
| 1980 | 100 days |
| 1981 | 121 days |
| 1982 | 49 days |
| 1983 | 103 days |
| 1984 | 84 days |
| 1985 | 87 days |
| 1986 | 131 days |
| 1987 | 128 days |
| 1988 | 129 days |
| 1989 | 63 days |
| 1990 | 114 days |
| 1991 | 69 days |
| 1992 | 79 days |
| 1993 | 69 days |
| 1994 | 114 days |
| 1995 | 159 days |
| 1996 | 79 days |
| 1997 | 67 days |
| 1998 | 84 days |
| 1999 | 84 days |
| 2000 | 84 days |
| 2001 | 89 days |
| 2002 | 168 days |
| 2003 | 84 days |
| 2004 | 114 days |
| 2005 | 101 days |
| 2006 | 62 days |
| 2007 | 50 days |
| 2008 | 128 days |
| 2009 | 101 days |
| 2010 | 85 days |
| 2011 | 97 days |
| 2012 | 138 days |
| 2013 | 67 days |
| 2014 | 75 days |
| 2015 | 97 days |
| 2016 | 106 days |
| 2017 | 92 days |
| 2018 | 130 days |
| 2019 | 106 days |
| 2020 | 160 days |
| 2021 | 136 days |
| 2022 | 98 days |
| 2023 | 74 days |
| 2024 | 110 days |
| 2025 | 78 days |
| 2026 | 97 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
55 years with a frostAcross 55 years with a frost, the median last spring frost at Grass Valley #2 falls on 18 April and the median first autumn frost on 6 November, which leaves a median of 200 days between them.
Fitted over all years, the growing season changes by +6.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1992 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 18 April | n/a | 12 April | n/a | -2.7 days per decade |
| First autumn frost | 6 November | n/a | 9 November | n/a | +3.4 days per decade |
| Growing days | 200 days | n/a | 218 days | n/a | +6.1 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
57 years, 1967 to 2025A day with at least 97.1 mm (3.8 in) of rain is expected about once in 2 years. A day with at least 200.7 mm (7.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 97.1 mm (3.8 in) | |
| 5 years | 127.0 mm (5.0 in) | |
| 10 years | 145.9 mm (5.7 in) | |
| 25 years | 168.8 mm (6.6 in) | |
| 50 years | 185.0 mm (7.3 in) | |
| 100 years | 200.7 mm (7.9 in) | Longer than the 57 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, 57 years of values from 1967 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: 229.9 mm (9.1 in) in 2021; 178.3 mm (7.0 in) in 2005; 176.5 mm (6.9 in) in 2014.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Grass Valley #2, at 1976 and 2019. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1976 ran 0.5 C (0.9 F) lower than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2019 ran 0.3 C (0.6 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1976 | -0.5 | -0.9 | likely | 5 |
| 2019 | -0.3 | -0.6 | 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
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Grass Valley #2 had a mean temperature of 14.0 C (57.1 F) and 1,294.8 mm (51.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Salt Springs Pwr House (United States, 107 km away), Orleans (United States, 314 km away) and Tuapse (Russia, 10,541 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Salt Springs Pwr House | United States | 107 km (66 mi) | 13.7 C (56.6 F) | 1,176.9 mm (46.3 in) | 0.85 |
| Orleans | United States | 314 km (195 mi) | 14.1 C (57.3 F) | 1,315.5 mm (51.8 in) | 0.99 |
| Tuapse | Russia | 10,541 km (6,550 mi) | 14.1 C (57.3 F) | 1,360.4 mm (53.6 in) | 1.05 |
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).