Mt Wilson Cbs Threshold Days by Year (USC00046006)
16 fixed thresholds counted per year at Mt Wilson Cbs (USC00046006): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Mt Wilson Cbs Thresholds
- Mt Wilson Cbs: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1983 with 49.
- Mt Wilson Cbs: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1983 with 32.
- Mt Wilson Cbs: days with 50 mm (1.97 in) or more of precipitation in 62 years, most in 1983 with 15.
- Mt Wilson Cbs: nights with a minimum temperature at or below 0 C (32 F) in 61 years, most in 1952 with 96.
- 16 fixed thresholds have at least one qualifying day at Mt Wilson Cbs.
Days at or above 30 C (86 F)
54 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1949 | 12 | 12 |
| 1950 | 23 | 15.6 |
| 1951 | 23 | 15.6 |
| 1952 | 5 | 15.6 |
| 1953 | 12 | 15.6 |
| 1954 | 14 | 15.6 |
| 1955 | 13 | 15.6 |
| 1956 | 8 | 15.6 |
| 1957 | 16 | 15.6 |
| 1958 | 17 | 15.6 |
| 1959 | 25 | 15.6 |
| 1960 | 31 | 15.7 |
| 1961 | 32 | 15.7 |
| 1962 | 16 | 15.7 |
| 1963 | 9 | 15.7 |
| 1964 | 13 | 15.7 |
| 1965 | 3 | 15.7 |
| 1966 | 9 | 15.7 |
| 1967 | 18 | 15.7 |
| 1968 | 6 | 15.7 |
| 1969 | 20 | 15.7 |
| 1970 | 21 | 23 |
| 1971 | 20 | 23 |
| 1972 | 23 | 23 |
| 1973 | 32 | 23 |
| 1974 | 8 | 23 |
| 1975 | 15 | 23 |
| 1976 | 13 | 23 |
| 1977 | 26 | 23 |
| 1978 | 28 | 23 |
| 1979 | 44 | 23 |
| 1980 | 39 | 23.7 |
| 1981 | 37 | 23.7 |
| 1982 | 17 | 23.7 |
| 1983 | 17 | 23.7 |
| 1984 | 20 | 23.7 |
| 1985 | 18 | 23.7 |
| 1989 | 18 | 23.7 |
| 1995 | 37 | 31.7 |
| 1996 | 41 | 31.7 |
| 1997 | 17 | 31.7 |
| 2001 | 38 | 44.3 |
| 2002 | 25 | 44.3 |
| 2006 | 51 | 44.3 |
| 2007 | 43 | 44.3 |
| 2008 | 58 | 44.3 |
| 2009 | 51 | 44.3 |
| 2010 | 39 | 49.8 |
| 2012 | 50 | 49.8 |
| 2013 | 49 | 49.8 |
| 2014 | 55 | 49.8 |
| 2015 | 50 | 49.8 |
| 2016 | 56 | 49.8 |
| 2026 | 11 | 11 |
| Year | First date | Last date |
|---|---|---|
| 1949 | 1949-06-15 | 1949-09-23 |
| 1950 | 1950-06-29 | 1950-10-13 |
| 1951 | 1951-05-25 | 1951-09-18 |
| 1952 | 1952-07-04 | 1952-08-31 |
| 1953 | 1953-07-03 | 1953-09-14 |
| 1954 | 1954-05-17 | 1954-08-31 |
| 1955 | 1955-08-29 | 1955-09-11 |
| 1956 | 1956-06-27 | 1956-09-09 |
| 1957 | 1957-06-03 | 1957-09-07 |
| 1958 | 1958-06-25 | 1958-09-06 |
| 1959 | 1959-06-19 | 1959-09-10 |
| 1960 | 1960-06-01 | 1960-09-26 |
| 1961 | 1961-06-13 | 1961-08-22 |
| 1962 | 1962-06-25 | 1962-09-19 |
| 1963 | 1963-07-14 | 1963-09-29 |
| 1964 | 1964-06-23 | 1964-08-24 |
| 1965 | 1965-07-28 | 1965-08-10 |
| 1966 | 1966-06-14 | 1966-08-18 |
| 1967 | 1967-05-21 | 1967-08-30 |
| 1968 | 1968-06-17 | 1968-08-31 |
| 1969 | 1969-07-01 | 1969-09-02 |
| 1970 | 1970-06-20 | 1970-09-11 |
| 1971 | 1971-07-07 | 1971-09-17 |
| 1972 | 1972-06-29 | 1972-08-24 |
| 1973 | 1973-06-08 | 1973-08-16 |
| 1974 | 1974-05-26 | 1974-09-20 |
| 1975 | 1975-07-07 | 1975-09-06 |
| 1976 | 1976-06-27 | 1976-09-02 |
| 1977 | 1977-06-04 | 1977-09-09 |
| 1978 | 1978-06-07 | 1978-09-25 |
| 1979 | 1979-06-05 | 1979-09-14 |
| 1980 | 1980-06-27 | 1980-10-08 |
| 1981 | 1981-06-04 | 1981-09-16 |
| 1982 | 1982-07-21 | 1982-09-23 |
| 1983 | 1983-06-17 | 1983-09-15 |
| 1984 | 1984-05-29 | 1984-09-19 |
| 1985 | 1985-06-16 | 1985-08-30 |
| 1989 | 1989-04-06 | 1989-09-05 |
| 1995 | 1995-06-23 | 1995-09-19 |
| 1996 | 1996-05-11 | 1996-10-08 |
| 1997 | 1997-06-17 | 1997-09-09 |
| 2001 | 2001-05-08 | 2001-09-30 |
| 2002 | 2002-06-06 | 2002-09-24 |
| 2006 | 2006-05-16 | 2006-09-13 |
| 2007 | 2007-06-03 | 2007-09-12 |
| 2008 | 2008-05-16 | 2008-10-27 |
| 2009 | 2009-04-20 | 2009-09-27 |
| 2010 | 2010-06-27 | 2010-10-15 |
| 2012 | 2012-05-16 | 2012-10-17 |
| 2013 | 2013-06-01 | 2013-09-19 |
| 2014 | 2014-05-15 | 2014-10-06 |
| 2015 | 2015-06-08 | 2015-10-09 |
| 2016 | 2016-05-31 | 2016-09-27 |
| 2026 | 2026-07-23 | 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 | 54 | 58 | 2008 | 11 |
| 35 C (95 F): Days | 20 | 9 | 2007 | 7 |
| 90 F (32.2 C): Days | 47 | 26 | 2016 | 26 |
| 100 F (37.8 C): Days | 4 | 2 | 2006 | 1 |
| 0 C (32 F): Ice days (max | 44 | 24 | 1949 | 1 |
| 0 C (32 F): Frost days (min | 61 | 96 | 1952 | 10 |
| -10 C (14 F): Days with min | 15 | 8 | 1949 | 4 |
| 20 C (68 F): Tropical nights (min | 60 | 49 | 1996 | 41 |
| 25 C (77 F): Days with min | 19 | 3 | 1950 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 66 | 49 | 1983 | 12 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 66 | 32 | 1983 | 8 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 62 | 15 | 1983 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 39 | 7 | 1978 | 2 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 6 | 2 | 1969 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 16 | 7 | 1949 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 3 | 1977 | 3 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.
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).