Black Rock Threshold Days by Year
17 fixed thresholds counted per year at Black Rock (USC00420730): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Black Rock Thresholds
- Black Rock: days with a maximum temperature at or above 30 C (86 F) in 92 years, most in 1960 with 121.
- Black Rock: days with a maximum temperature at or above 90 F (32.2 C) in 92 years, most in 1960 with 103.
- Black Rock: days with a maximum temperature at or below 0 C (32 F) in 91 years, most in 2007 with 37.
- Black Rock: nights with a minimum temperature at or below 0 C (32 F) in 91 years, most in 1913 with 228.
- 17 fixed thresholds have at least one qualifying day at Black Rock.
Days at or above 30 C (86 F)
92 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1901 | 64 | 46.3 |
| 1902 | 52 | 46.3 |
| 1903 | 45 | 46.3 |
| 1904 | 24 | 46.3 |
| 1910 | 99 | 78 |
| 1911 | 74 | 78 |
| 1912 | 51 | 78 |
| 1913 | 68 | 78 |
| 1914 | 70 | 78 |
| 1915 | 84 | 78 |
| 1917 | 84 | 78 |
| 1918 | 94 | 78 |
| 1921 | 84 | 86.4 |
| 1922 | 95 | 86.4 |
| 1923 | 75 | 86.4 |
| 1924 | 79 | 86.4 |
| 1926 | 99 | 86.4 |
| 1952 | 97 | 87.4 |
| 1953 | 93 | 87.4 |
| 1954 | 79 | 87.4 |
| 1955 | 79 | 87.4 |
| 1956 | 99 | 87.4 |
| 1957 | 86 | 87.4 |
| 1958 | 89 | 87.4 |
| 1959 | 77 | 87.4 |
| 1960 | 121 | 87 |
| 1961 | 95 | 87 |
| 1962 | 97 | 87 |
| 1963 | 86 | 87 |
| 1964 | 88 | 87 |
| 1965 | 61 | 87 |
| 1966 | 95 | 87 |
| 1967 | 74 | 87 |
| 1968 | 69 | 87 |
| 1969 | 84 | 87 |
| 1970 | 79 | 83.3 |
| 1971 | 77 | 83.3 |
| 1972 | 72 | 83.3 |
| 1973 | 82 | 83.3 |
| 1974 | 95 | 83.3 |
| 1975 | 76 | 83.3 |
| 1976 | 79 | 83.3 |
| 1977 | 88 | 83.3 |
| 1978 | 89 | 83.3 |
| 1979 | 96 | 83.3 |
| 1980 | 79 | 88.3 |
| 1981 | 92 | 88.3 |
| 1982 | 83 | 88.3 |
| 1983 | 82 | 88.3 |
| 1984 | 92 | 88.3 |
| 1985 | 81 | 88.3 |
| 1986 | 94 | 88.3 |
| 1987 | 86 | 88.3 |
| 1988 | 104 | 88.3 |
| 1989 | 90 | 88.3 |
| 1990 | 95 | 82.6 |
| 1991 | 82 | 82.6 |
| 1992 | 88 | 82.6 |
| 1993 | 80 | 82.6 |
| 1994 | 96 | 82.6 |
| 1995 | 73 | 82.6 |
| 1996 | 97 | 82.6 |
| 1997 | 75 | 82.6 |
| 1998 | 68 | 82.6 |
| 1999 | 72 | 82.6 |
| 2000 | 98 | 93.1 |
| 2001 | 111 | 93.1 |
| 2002 | 97 | 93.1 |
| 2003 | 100 | 93.1 |
| 2004 | 80 | 93.1 |
| 2005 | 74 | 93.1 |
| 2006 | 95 | 93.1 |
| 2007 | 107 | 93.1 |
| 2008 | 89 | 93.1 |
| 2009 | 80 | 93.1 |
| 2010 | 88 | 97.3 |
| 2011 | 79 | 97.3 |
| 2012 | 108 | 97.3 |
| 2013 | 100 | 97.3 |
| 2014 | 96 | 97.3 |
| 2015 | 104 | 97.3 |
| 2016 | 96 | 97.3 |
| 2017 | 101 | 97.3 |
| 2018 | 115 | 97.3 |
| 2019 | 86 | 97.3 |
| 2020 | 110 | 104 |
| 2021 | 109 | 104 |
| 2022 | 105 | 104 |
| 2023 | 89 | 104 |
| 2024 | 108 | 104 |
| 2025 | 106 | 104 |
| 2026 | 101 | 104 |
| Year | First date | Last date |
|---|---|---|
| 1901 | 1901-05-17 | 1901-09-19 |
| 1902 | 1902-05-28 | 1902-09-10 |
| 1903 | 1903-05-13 | 1903-09-04 |
| 1904 | 1904-06-14 | 1904-08-14 |
| 1910 | 1910-04-26 | 1910-10-10 |
| 1911 | 1911-05-13 | 1911-09-25 |
| 1912 | 1912-05-29 | 1912-09-19 |
| 1913 | 1913-06-13 | 1913-09-21 |
| 1914 | 1914-05-29 | 1914-09-25 |
| 1915 | 1915-05-16 | 1915-10-09 |
| 1917 | 1917-06-17 | 1917-10-06 |
| 1918 | 1918-05-04 | 1918-09-30 |
| 1921 | 1921-06-06 | 1921-10-20 |
| 1922 | 1922-05-25 | 1922-10-09 |
| 1923 | 1923-05-09 | 1923-09-15 |
| 1924 | 1924-05-08 | 1924-09-25 |
| 1926 | 1926-05-17 | 1926-10-17 |
| 1952 | 1952-05-14 | 1952-10-08 |
| 1953 | 1953-06-10 | 1953-10-06 |
| 1954 | 1954-05-05 | 1954-09-22 |
| 1955 | 1955-05-21 | 1955-09-14 |
| 1956 | 1956-05-17 | 1956-10-06 |
| 1957 | 1957-06-02 | 1957-09-30 |
| 1958 | 1958-05-05 | 1958-09-21 |
| 1959 | 1959-04-04 | 1959-09-10 |
| 1960 | 1960-04-05 | 1960-10-05 |
| 1961 | 1961-05-21 | 1961-09-14 |
| 1962 | 1962-04-14 | 1962-09-23 |
| 1963 | 1963-05-06 | 1963-10-08 |
| 1964 | 1964-05-15 | 1964-10-14 |
| 1965 | 1965-06-06 | 1965-10-10 |
| 1966 | 1966-04-25 | 1966-09-25 |
| 1967 | 1967-05-22 | 1967-10-19 |
| 1968 | 1968-05-19 | 1968-09-13 |
| 1969 | 1969-05-11 | 1969-09-29 |
| 1970 | 1970-05-17 | 1970-09-11 |
| 1971 | 1971-06-08 | 1971-09-13 |
| 1972 | 1972-05-15 | 1972-09-18 |
| 1973 | 1973-05-19 | 1973-09-30 |
| 1974 | 1974-05-08 | 1974-10-02 |
| 1975 | 1975-05-11 | 1975-10-05 |
| 1976 | 1976-05-14 | 1976-09-05 |
| 1977 | 1977-04-23 | 1977-09-08 |
| 1978 | 1978-05-13 | 1978-10-01 |
| 1979 | 1979-05-14 | 1979-10-07 |
| 1980 | 1980-05-21 | 1980-09-28 |
| 1981 | 1981-05-01 | 1981-09-22 |
| 1982 | 1982-05-22 | 1982-09-24 |
| 1983 | 1983-05-24 | 1983-09-18 |
| 1984 | 1984-05-09 | 1984-09-20 |
| 1985 | 1985-05-01 | 1985-09-15 |
| 1986 | 1986-05-02 | 1986-09-08 |
| 1987 | 1987-04-17 | 1987-10-07 |
| 1988 | 1988-04-12 | 1988-10-04 |
| 1989 | 1989-04-19 | 1989-09-29 |
| 1990 | 1990-05-21 | 1990-10-04 |
| 1991 | 1991-06-07 | 1991-10-16 |
| 1992 | 1992-04-26 | 1992-10-13 |
| 1993 | 1993-05-11 | 1993-10-04 |
| 1994 | 1994-04-17 | 1994-09-28 |
| 1995 | 1995-05-20 | 1995-09-17 |
| 1996 | 1996-04-24 | 1996-10-10 |
| 1997 | 1997-05-14 | 1997-09-10 |
| 1998 | 1998-06-01 | 1998-09-18 |
| 1999 | 1999-05-28 | 1999-09-25 |
| 2000 | 2000-04-27 | 2000-10-02 |
| 2001 | 2001-04-18 | 2001-09-28 |
| 2002 | 2002-04-14 | 2002-09-15 |
| 2003 | 2003-05-22 | 2003-10-18 |
| 2004 | 2004-05-04 | 2004-09-17 |
| 2005 | 2005-05-20 | 2005-09-09 |
| 2006 | 2006-05-16 | 2006-09-13 |
| 2007 | 2007-04-29 | 2007-09-14 |
| 2008 | 2008-05-18 | 2008-10-01 |
| 2009 | 2009-05-11 | 2009-09-28 |
| 2010 | 2010-06-02 | 2010-10-02 |
| 2011 | 2011-06-05 | 2011-09-30 |
| 2012 | 2012-04-22 | 2012-10-09 |
| 2013 | 2013-05-12 | 2013-09-17 |
| 2014 | 2014-05-03 | 2014-09-26 |
| 2015 | 2015-03-28 | 2015-10-01 |
| 2016 | 2016-05-13 | 2016-09-20 |
| 2017 | 2017-05-05 | 2017-09-15 |
| 2018 | 2018-04-28 | 2018-09-29 |
| 2019 | 2019-06-06 | 2019-09-15 |
| 2020 | 2020-04-27 | 2020-09-26 |
| 2021 | 2021-04-05 | 2021-09-27 |
| 2022 | 2022-05-06 | 2022-09-29 |
| 2023 | 2023-04-30 | 2023-09-28 |
| 2024 | 2024-05-28 | 2024-10-11 |
| 2025 | 2025-04-11 | 2025-09-25 |
| 2026 | 2026-03-19 | 2026-08-31 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 92 | 121 | 1960 | 101 |
| 35 C (95 F): Days | 89 | 64 | 1960 | 65 |
| 40 C (104 F): Days | 23 | 7 | 1960 | 7 |
| 90 F (32.2 C): Days | 92 | 103 | 1960 | 89 |
| 100 F (37.8 C): Days | 72 | 27 | 1960 | 31 |
| 0 C (32 F): Ice days (max | 91 | 37 | 2007 | 2 |
| 0 C (32 F): Frost days (min | 91 | 228 | 1913 | 87 |
| -10 C (14 F): Days with min | 91 | 76 | 1989 | 23 |
| -20 C (-4 F): Days with min | 83 | 30 | 1922 | 1 |
| -30 C (-22 F): Days with min | 19 | 4 | 1912 | 2 |
| 20 C (68 F): Tropical nights (min | 37 | 7 | 2018 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 78 | 12 | 1903 | 4 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 44 | 3 | 2011 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 2 | 1 | 1969 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 51 | 9 | 1984 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 10 | 2 | 1988 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 2010 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.
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).