Altamont Threshold Days by Year (USC00420074)
13 fixed thresholds counted per year at Altamont (USC00420074): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Altamont Thresholds
- Altamont: days with a maximum temperature at or above 30 C (86 F) in 66 years, most in 2002 with 53.
- Altamont: days with a maximum temperature at or below 0 C (32 F) in 66 years, most in 1973 with 84.
- Altamont: nights with a minimum temperature at or below 0 C (32 F) in 65 years, most in 1984 with 221.
- Altamont: nights with a minimum temperature at or below -10 C (14 F) in 65 years, most in 2023 with 105.
- 13 fixed thresholds have at least one qualifying day at Altamont.
Days at or above 30 C (86 F)
66 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1954 | 27 | 26.3 |
| 1955 | 22 | 26.3 |
| 1956 | 21 | 26.3 |
| 1957 | 15 | 26.3 |
| 1958 | 38 | 26.3 |
| 1959 | 35 | 26.3 |
| 1960 | 46 | 30.3 |
| 1961 | 44 | 30.3 |
| 1962 | 23 | 30.3 |
| 1963 | 29 | 30.3 |
| 1967 | 24 | 30.3 |
| 1968 | 16 | 30.3 |
| 1969 | 30 | 30.3 |
| 1970 | 19 | 19.9 |
| 1971 | 27 | 19.9 |
| 1972 | 12 | 19.9 |
| 1973 | 21 | 19.9 |
| 1974 | 26 | 19.9 |
| 1975 | 11 | 19.9 |
| 1976 | 15 | 19.9 |
| 1977 | 19 | 19.9 |
| 1978 | 22 | 19.9 |
| 1979 | 27 | 19.9 |
| 1980 | 23 | 24.9 |
| 1981 | 24 | 24.9 |
| 1982 | 28 | 24.9 |
| 1983 | 22 | 24.9 |
| 1984 | 22 | 24.9 |
| 1985 | 37 | 24.9 |
| 1986 | 28 | 24.9 |
| 1987 | 11 | 24.9 |
| 1988 | 32 | 24.9 |
| 1989 | 22 | 24.9 |
| 1990 | 19 | 17.9 |
| 1991 | 22 | 17.9 |
| 1992 | 26 | 17.9 |
| 1993 | 3 | 17.9 |
| 1994 | 35 | 17.9 |
| 1995 | 14 | 17.9 |
| 1996 | 20 | 17.9 |
| 1997 | 7 | 17.9 |
| 1998 | 15 | 17.9 |
| 2002 | 53 | 34.3 |
| 2003 | 45 | 34.3 |
| 2004 | 12 | 34.3 |
| 2005 | 24 | 34.3 |
| 2006 | 35 | 34.3 |
| 2007 | 49 | 34.3 |
| 2008 | 35 | 34.3 |
| 2009 | 21 | 34.3 |
| 2010 | 20 | 29.6 |
| 2011 | 9 | 29.6 |
| 2012 | 48 | 29.6 |
| 2013 | 45 | 29.6 |
| 2014 | 34 | 29.6 |
| 2015 | 29 | 29.6 |
| 2017 | 37 | 29.6 |
| 2018 | 34 | 29.6 |
| 2019 | 10 | 29.6 |
| 2020 | 12 | 24.7 |
| 2021 | 37 | 24.7 |
| 2022 | 28 | 24.7 |
| 2023 | 10 | 24.7 |
| 2024 | 21 | 24.7 |
| 2025 | 28 | 24.7 |
| 2026 | 37 | 24.7 |
| Year | First date | Last date |
|---|---|---|
| 1954 | 1954-06-21 | 1954-09-01 |
| 1955 | 1955-06-21 | 1955-09-05 |
| 1956 | 1956-06-10 | 1956-08-23 |
| 1957 | 1957-06-28 | 1957-08-10 |
| 1958 | 1958-05-29 | 1958-09-08 |
| 1959 | 1959-06-06 | 1959-09-07 |
| 1960 | 1960-06-03 | 1960-08-30 |
| 1961 | 1961-06-09 | 1961-08-28 |
| 1962 | 1962-06-23 | 1962-08-16 |
| 1963 | 1963-06-27 | 1963-08-16 |
| 1967 | 1967-07-01 | 1967-09-05 |
| 1968 | 1968-06-03 | 1968-07-25 |
| 1969 | 1969-07-04 | 1969-08-29 |
| 1970 | 1970-06-25 | 1970-08-26 |
| 1971 | 1971-06-18 | 1971-08-17 |
| 1972 | 1972-07-01 | 1972-08-13 |
| 1973 | 1973-06-09 | 1973-08-20 |
| 1974 | 1974-06-14 | 1974-08-28 |
| 1975 | 1975-07-03 | 1975-08-07 |
| 1976 | 1976-06-22 | 1976-09-06 |
| 1977 | 1977-06-04 | 1977-09-08 |
| 1978 | 1978-07-14 | 1978-09-06 |
| 1979 | 1979-06-26 | 1979-09-09 |
| 1980 | 1980-06-30 | 1980-08-14 |
| 1981 | 1981-06-09 | 1981-08-09 |
| 1982 | 1982-06-28 | 1982-09-05 |
| 1983 | 1983-05-29 | 1983-09-01 |
| 1984 | 1984-06-27 | 1984-08-31 |
| 1985 | 1985-06-08 | 1985-08-31 |
| 1986 | 1986-06-05 | 1986-08-20 |
| 1987 | 1987-06-14 | 1987-09-02 |
| 1988 | 1988-06-20 | 1988-08-26 |
| 1989 | 1989-05-07 | 1989-08-08 |
| 1990 | 1990-06-23 | 1990-09-14 |
| 1991 | 1991-07-03 | 1991-08-31 |
| 1992 | 1992-04-29 | 1992-08-30 |
| 1993 | 1993-07-03 | 1993-08-01 |
| 1994 | 1994-06-25 | 1994-08-27 |
| 1995 | 1995-07-08 | 1995-09-05 |
| 1996 | 1996-06-14 | 1996-09-01 |
| 1997 | 1997-07-08 | 1997-08-03 |
| 1998 | 1998-07-01 | 1998-09-05 |
| 2002 | 2002-05-31 | 2002-09-06 |
| 2003 | 2003-05-28 | 2003-08-22 |
| 2004 | 2004-07-11 | 2004-08-16 |
| 2005 | 2005-06-21 | 2005-08-09 |
| 2006 | 2006-06-03 | 2006-08-23 |
| 2007 | 2007-06-14 | 2007-09-03 |
| 2008 | 2008-06-18 | 2008-08-25 |
| 2009 | 2009-07-01 | 2009-08-30 |
| 2010 | 2010-06-07 | 2010-08-28 |
| 2011 | 2011-07-05 | 2011-08-27 |
| 2012 | 2012-06-04 | 2012-09-16 |
| 2013 | 2013-05-15 | 2013-09-08 |
| 2014 | 2014-05-28 | 2014-08-19 |
| 2015 | 2015-06-18 | 2015-08-24 |
| 2017 | 2017-06-21 | 2017-09-04 |
| 2018 | 2018-06-14 | 2018-08-26 |
| 2019 | 2019-07-11 | 2019-09-02 |
| 2020 | 2020-07-06 | 2020-09-06 |
| 2021 | 2021-06-03 | 2021-08-15 |
| 2022 | 2022-06-11 | 2022-09-08 |
| 2023 | 2023-07-09 | 2023-08-18 |
| 2024 | 2024-06-12 | 2024-08-07 |
| 2025 | 2025-06-13 | 2025-08-21 |
| 2026 | 2026-06-18 | 2026-08-21 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 66 | 53 | 2002 | 37 |
| 35 C (95 F): Days | 13 | 4 | 2002 | 1 |
| 90 F (32.2 C): Days | 59 | 26 | 2002 | 16 |
| 0 C (32 F): Ice days (max | 66 | 84 | 1973 | 7 |
| 0 C (32 F): Frost days (min | 65 | 221 | 1984 | 98 |
| -10 C (14 F): Days with min | 65 | 105 | 2023 | 24 |
| -20 C (-4 F): Days with min | 59 | 26 | 1985 | 4 |
| -30 C (-22 F): Days with min | 9 | 4 | 1989 | 1 |
| 20 C (68 F): Tropical nights (min | 1 | 2 | 2002 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 65 | 12 | 1997 | 8 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 22 | 2 | 1957 | 2 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 50 | 8 | 1997 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 1968 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-17).