Diablo Dam Threshold Days by Year (USC00452157)
17 fixed thresholds counted per year at Diablo Dam (USC00452157): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Diablo Dam Thresholds
- Diablo Dam: days with 10 mm (0.39 in) or more of precipitation in 101 years, most in 1990 with 88.
- Diablo Dam: days with 25 mm (0.98 in) or more of precipitation in 101 years, most in 1967 with 33.
- Diablo Dam: days with a maximum temperature at or above 30 C (86 F) in 100 years, most in 1958 with 57.
- Diablo Dam: nights with a minimum temperature at or below 0 C (32 F) in 100 years, most in 1919 with 129.
- 17 fixed thresholds have at least one qualifying day at Diablo Dam.
Days at or above 30 C (86 F)
100 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1916 | 18 | 25.5 |
| 1917 | 28 | 25.5 |
| 1918 | 35 | 25.5 |
| 1919 | 21 | 25.5 |
| 1921 | 7 | 20.8 |
| 1922 | 27 | 20.8 |
| 1923 | 23 | 20.8 |
| 1924 | 30 | 20.8 |
| 1929 | 17 | 20.8 |
| 1930 | 22 | 17.9 |
| 1931 | 15 | 17.9 |
| 1934 | 10 | 17.9 |
| 1935 | 20 | 17.9 |
| 1936 | 10 | 17.9 |
| 1937 | 15 | 17.9 |
| 1938 | 22 | 17.9 |
| 1939 | 29 | 17.9 |
| 1940 | 17 | 16.9 |
| 1941 | 16 | 16.9 |
| 1942 | 24 | 16.9 |
| 1944 | 20 | 16.9 |
| 1945 | 19 | 16.9 |
| 1946 | 20 | 16.9 |
| 1947 | 5 | 16.9 |
| 1948 | 12 | 16.9 |
| 1949 | 19 | 16.9 |
| 1950 | 19 | 22.8 |
| 1951 | 29 | 22.8 |
| 1952 | 27 | 22.8 |
| 1953 | 21 | 22.8 |
| 1954 | 1 | 22.8 |
| 1955 | 19 | 22.8 |
| 1956 | 23 | 22.8 |
| 1957 | 14 | 22.8 |
| 1958 | 57 | 22.8 |
| 1959 | 18 | 22.8 |
| 1960 | 18 | 18.7 |
| 1961 | 31 | 18.7 |
| 1962 | 13 | 18.7 |
| 1963 | 18 | 18.7 |
| 1964 | 13 | 18.7 |
| 1965 | 8 | 18.7 |
| 1966 | 14 | 18.7 |
| 1967 | 30 | 18.7 |
| 1968 | 19 | 18.7 |
| 1969 | 23 | 18.7 |
| 1970 | 25 | 21.1 |
| 1971 | 24 | 21.1 |
| 1972 | 15 | 21.1 |
| 1973 | 22 | 21.1 |
| 1974 | 27 | 21.1 |
| 1975 | 19 | 21.1 |
| 1976 | 5 | 21.1 |
| 1977 | 29 | 21.1 |
| 1978 | 25 | 21.1 |
| 1979 | 20 | 21.1 |
| 1980 | 11 | 18.3 |
| 1981 | 23 | 18.3 |
| 1982 | 15 | 18.3 |
| 1983 | 11 | 18.3 |
| 1984 | 14 | 18.3 |
| 1986 | 25 | 18.3 |
| 1987 | 25 | 18.3 |
| 1988 | 25 | 18.3 |
| 1989 | 16 | 18.3 |
| 1990 | 25 | 20.7 |
| 1991 | 14 | 20.7 |
| 1992 | 25 | 20.7 |
| 1993 | 16 | 20.7 |
| 1994 | 14 | 20.7 |
| 1995 | 20 | 20.7 |
| 1996 | 28 | 20.7 |
| 1998 | 26 | 20.7 |
| 1999 | 18 | 20.7 |
| 2000 | 11 | 21.3 |
| 2001 | 14 | 21.3 |
| 2002 | 21 | 21.3 |
| 2003 | 34 | 21.3 |
| 2004 | 31 | 21.3 |
| 2005 | 19 | 21.3 |
| 2006 | 29 | 21.3 |
| 2007 | 17 | 21.3 |
| 2008 | 16 | 21.3 |
| 2010 | 18 | 24.4 |
| 2011 | 12 | 24.4 |
| 2012 | 19 | 24.4 |
| 2013 | 23 | 24.4 |
| 2014 | 24 | 24.4 |
| 2015 | 34 | 24.4 |
| 2016 | 23 | 24.4 |
| 2017 | 35 | 24.4 |
| 2018 | 40 | 24.4 |
| 2019 | 16 | 24.4 |
| 2020 | 23 | 31.9 |
| 2021 | 30 | 31.9 |
| 2022 | 34 | 31.9 |
| 2023 | 36 | 31.9 |
| 2024 | 39 | 31.9 |
| 2025 | 32 | 31.9 |
| 2026 | 29 | 31.9 |
| Year | First date | Last date |
|---|---|---|
| 1916 | 1916-06-13 | 1916-08-29 |
| 1917 | 1917-06-14 | 1917-08-27 |
| 1918 | 1918-06-06 | 1918-09-28 |
| 1919 | 1919-05-21 | 1919-08-31 |
| 1921 | 1921-06-02 | 1921-08-13 |
| 1922 | 1922-05-30 | 1922-09-11 |
| 1923 | 1923-05-08 | 1923-09-11 |
| 1924 | 1924-05-10 | 1924-09-13 |
| 1929 | 1929-05-19 | 1929-09-16 |
| 1930 | 1930-06-06 | 1930-09-03 |
| 1931 | 1931-06-05 | 1931-08-27 |
| 1934 | 1934-07-24 | 1934-09-03 |
| 1935 | 1935-06-05 | 1935-09-08 |
| 1936 | 1936-05-25 | 1936-09-04 |
| 1937 | 1937-06-01 | 1937-09-14 |
| 1938 | 1938-06-07 | 1938-09-18 |
| 1939 | 1939-05-14 | 1939-09-09 |
| 1940 | 1940-06-12 | 1940-09-24 |
| 1941 | 1941-05-23 | 1941-08-20 |
| 1942 | 1942-06-30 | 1942-09-26 |
| 1944 | 1944-05-28 | 1944-09-12 |
| 1945 | 1945-05-30 | 1945-09-02 |
| 1946 | 1946-06-20 | 1946-09-11 |
| 1947 | 1947-05-25 | 1947-09-23 |
| 1948 | 1948-05-27 | 1948-09-09 |
| 1949 | 1949-05-12 | 1949-09-09 |
| 1950 | 1950-06-17 | 1950-09-22 |
| 1951 | 1951-05-23 | 1951-09-18 |
| 1952 | 1952-05-28 | 1952-09-25 |
| 1953 | 1953-05-06 | 1953-09-15 |
| 1954 | 1954-08-02 | 1954-08-02 |
| 1955 | 1955-06-09 | 1955-09-07 |
| 1956 | 1956-05-17 | 1956-09-07 |
| 1957 | 1957-05-09 | 1957-09-25 |
| 1958 | 1958-05-18 | 1958-09-11 |
| 1959 | 1959-05-14 | 1959-08-08 |
| 1960 | 1960-07-05 | 1960-08-11 |
| 1961 | 1961-05-20 | 1961-08-23 |
| 1962 | 1962-06-24 | 1962-09-05 |
| 1963 | 1963-05-19 | 1963-09-10 |
| 1964 | 1964-06-01 | 1964-08-25 |
| 1965 | 1965-08-01 | 1965-09-01 |
| 1966 | 1966-05-05 | 1966-09-23 |
| 1967 | 1967-06-16 | 1967-09-28 |
| 1968 | 1968-05-19 | 1968-09-06 |
| 1969 | 1969-05-09 | 1969-09-11 |
| 1970 | 1970-06-01 | 1970-08-24 |
| 1971 | 1971-05-12 | 1971-08-30 |
| 1972 | 1972-05-29 | 1972-09-04 |
| 1973 | 1973-05-14 | 1973-09-11 |
| 1974 | 1974-06-13 | 1974-09-25 |
| 1975 | 1975-06-02 | 1975-09-23 |
| 1976 | 1976-06-19 | 1976-09-21 |
| 1977 | 1977-04-25 | 1977-09-13 |
| 1978 | 1978-05-20 | 1978-08-30 |
| 1979 | 1979-05-23 | 1979-09-18 |
| 1980 | 1980-05-05 | 1980-08-12 |
| 1981 | 1981-07-04 | 1981-09-17 |
| 1982 | 1982-06-11 | 1982-08-26 |
| 1983 | 1983-05-25 | 1983-08-22 |
| 1984 | 1984-06-24 | 1984-08-22 |
| 1986 | 1986-05-26 | 1986-09-06 |
| 1987 | 1987-04-28 | 1987-09-08 |
| 1988 | 1988-05-22 | 1988-09-15 |
| 1989 | 1989-06-04 | 1989-09-26 |
| 1990 | 1990-06-22 | 1990-09-23 |
| 1991 | 1991-07-03 | 1991-10-12 |
| 1992 | 1992-05-04 | 1992-08-18 |
| 1993 | 1993-05-13 | 1993-09-10 |
| 1994 | 1994-05-07 | 1994-09-24 |
| 1995 | 1995-06-28 | 1995-09-24 |
| 1996 | 1996-06-03 | 1996-08-30 |
| 1998 | 1998-05-01 | 1998-09-17 |
| 1999 | 1999-05-24 | 1999-09-14 |
| 2000 | 2000-06-05 | 2000-08-24 |
| 2001 | 2001-05-23 | 2001-09-14 |
| 2002 | 2002-06-13 | 2002-09-14 |
| 2003 | 2003-06-05 | 2003-09-29 |
| 2004 | 2004-06-04 | 2004-08-20 |
| 2005 | 2005-05-27 | 2005-08-26 |
| 2006 | 2006-05-16 | 2006-09-05 |
| 2007 | 2007-05-16 | 2007-09-14 |
| 2008 | 2008-05-17 | 2008-08-18 |
| 2010 | 2010-07-07 | 2010-08-26 |
| 2011 | 2011-07-25 | 2011-09-12 |
| 2012 | 2012-05-15 | 2012-09-09 |
| 2013 | 2013-05-07 | 2013-09-15 |
| 2014 | 2014-07-08 | 2014-09-07 |
| 2015 | 2015-06-07 | 2015-09-12 |
| 2016 | 2016-04-19 | 2016-08-27 |
| 2017 | 2017-05-28 | 2017-09-12 |
| 2018 | 2018-05-09 | 2018-09-07 |
| 2019 | 2019-05-11 | 2019-09-07 |
| 2020 | 2020-05-11 | 2020-09-11 |
| 2021 | 2021-06-02 | 2021-09-08 |
| 2022 | 2022-06-26 | 2022-09-11 |
| 2023 | 2023-05-13 | 2023-09-16 |
| 2024 | 2024-05-11 | 2024-09-08 |
| 2025 | 2025-05-29 | 2025-09-17 |
| 2026 | 2026-05-03 | 2026-08-26 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 100 | 57 | 1958 | 29 |
| 35 C (95 F): Days | 82 | 14 | 2022 | 3 |
| 40 C (104 F): Days | 11 | 3 | 2021 | 3 |
| 90 F (32.2 C): Days | 99 | 32 | 1958 | 13 |
| 100 F (37.8 C): Days | 42 | 6 | 2021 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 2021 | 1 |
| 0 C (32 F): Ice days (max | 97 | 40 | 1916 | 1 |
| 0 C (32 F): Frost days (min | 100 | 129 | 1919 | 41 |
| -10 C (14 F): Days with min | 77 | 26 | 1916 | 4 |
| 20 C (68 F): Tropical nights (min | 1 | 3 | 1941 | 3 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 101 | 88 | 1990 | 33 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 101 | 33 | 1967 | 14 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 100 | 14 | 1990 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 24 | 3 | 1975 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 81 | 20 | 2008 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 49 | 6 | 1937 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 6 | 2 | 1935 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.
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).