San Luis Dam Threshold Days by Year (USC00047846)
14 fixed thresholds counted per year at San Luis Dam (USC00047846): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for San Luis Dam Thresholds
- San Luis Dam: days with a maximum temperature at or above 30 C (86 F) in 44 years, most in 1997 with 119.
- San Luis Dam: days with a maximum temperature at or above 35 C (95 F) in 44 years, most in 2001 with 59.
- San Luis Dam: days with a maximum temperature at or above 90 F (32.2 C) in 44 years, most in 1967 with 91.
- San Luis Dam: days with a maximum temperature at or above 100 F (37.8 C) in 44 years, most in 1984 with 25.
- 14 fixed thresholds have at least one qualifying day at San Luis Dam.
Days at or above 30 C (86 F)
44 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1963 | 92 | 97.3 |
| 1964 | 101 | 97.3 |
| 1965 | 94 | 97.3 |
| 1966 | 96 | 97.3 |
| 1967 | 109 | 97.3 |
| 1968 | 96 | 97.3 |
| 1969 | 93 | 97.3 |
| 1970 | 101 | 91.5 |
| 1971 | 96 | 91.5 |
| 1972 | 90 | 91.5 |
| 1973 | 85 | 91.5 |
| 1974 | 102 | 91.5 |
| 1975 | 88 | 91.5 |
| 1976 | 74 | 91.5 |
| 1977 | 90 | 91.5 |
| 1978 | 88 | 91.5 |
| 1979 | 101 | 91.5 |
| 1980 | 75 | 89.4 |
| 1981 | 103 | 89.4 |
| 1982 | 69 | 89.4 |
| 1983 | 77 | 89.4 |
| 1984 | 106 | 89.4 |
| 1985 | 92 | 89.4 |
| 1986 | 93 | 89.4 |
| 1987 | 88 | 89.4 |
| 1988 | 95 | 89.4 |
| 1989 | 96 | 89.4 |
| 1990 | 105 | 100.2 |
| 1991 | 110 | 100.2 |
| 1992 | 117 | 100.2 |
| 1993 | 86 | 100.2 |
| 1994 | 94 | 100.2 |
| 1995 | 99 | 100.2 |
| 1996 | 103 | 100.2 |
| 1997 | 119 | 100.2 |
| 1998 | 75 | 100.2 |
| 1999 | 94 | 100.2 |
| 2000 | 101 | 107.9 |
| 2001 | 118 | 107.9 |
| 2002 | 104 | 107.9 |
| 2003 | 111 | 107.9 |
| 2004 | 114 | 107.9 |
| 2005 | 99 | 107.9 |
| 2006 | 108 | 107.9 |
| Year | First date | Last date |
|---|---|---|
| 1963 | 1963-05-17 | 1963-10-04 |
| 1964 | 1964-04-15 | 1964-10-23 |
| 1965 | 1965-04-26 | 1965-10-25 |
| 1966 | 1966-04-02 | 1966-10-26 |
| 1967 | 1967-05-16 | 1967-10-14 |
| 1968 | 1968-04-11 | 1968-09-29 |
| 1969 | 1969-05-11 | 1969-10-02 |
| 1970 | 1970-05-03 | 1970-10-12 |
| 1971 | 1971-05-25 | 1971-10-14 |
| 1972 | 1972-04-28 | 1972-10-08 |
| 1973 | 1973-04-26 | 1973-10-01 |
| 1974 | 1974-05-01 | 1974-10-18 |
| 1975 | 1975-05-14 | 1975-10-06 |
| 1976 | 1976-05-08 | 1976-10-14 |
| 1977 | 1977-05-31 | 1977-10-16 |
| 1978 | 1978-05-09 | 1978-10-15 |
| 1979 | 1979-05-12 | 1979-10-07 |
| 1980 | 1980-05-05 | 1980-10-10 |
| 1981 | 1981-04-30 | 1981-09-23 |
| 1982 | 1982-05-17 | 1982-10-15 |
| 1983 | 1983-05-19 | 1983-09-22 |
| 1984 | 1984-04-15 | 1984-10-08 |
| 1985 | 1985-04-14 | 1985-10-06 |
| 1986 | 1986-04-21 | 1986-10-10 |
| 1987 | 1987-04-16 | 1987-10-07 |
| 1988 | 1988-04-11 | 1988-10-22 |
| 1989 | 1989-04-06 | 1989-10-20 |
| 1990 | 1990-04-04 | 1990-10-28 |
| 1991 | 1991-05-24 | 1991-10-22 |
| 1992 | 1992-04-26 | 1992-10-13 |
| 1993 | 1993-04-30 | 1993-10-04 |
| 1994 | 1994-04-16 | 1994-10-10 |
| 1995 | 1995-05-20 | 1995-10-29 |
| 1996 | 1996-04-27 | 1996-10-10 |
| 1997 | 1997-04-16 | 1997-10-18 |
| 1998 | 1998-04-23 | 1998-09-18 |
| 1999 | 1999-04-17 | 1999-10-15 |
| 2000 | 2000-05-20 | 2000-10-06 |
| 2001 | 2001-04-26 | 2001-10-17 |
| 2002 | 2002-04-14 | 2002-10-10 |
| 2003 | 2003-05-14 | 2003-10-29 |
| 2004 | 2004-04-11 | 2004-10-15 |
| 2005 | 2005-05-14 | 2005-10-18 |
| 2006 | 2006-05-01 | 2006-09-30 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 44 | 119 | 1997 | 108 |
| 35 C (95 F): Days | 44 | 59 | 2001 | 48 |
| 40 C (104 F): Days | 37 | 11 | 2006 | 11 |
| 90 F (32.2 C): Days | 44 | 91 | 1967 | 82 |
| 100 F (37.8 C): Days | 44 | 25 | 1984 | 19 |
| 110 F (43.3 C): Days | 1 | 3 | 2006 | 3 |
| 0 C (32 F): Ice days (max | 1 | 1 | 1972 | 1 |
| 0 C (32 F): Frost days (min | 40 | 36 | 1985 | 9 |
| -10 C (14 F): Days with min | 1 | 1 | 1990 | 1 |
| 20 C (68 F): Tropical nights (min | 44 | 54 | 1967 | 29 |
| 25 C (77 F): Days with min | 31 | 8 | 2006 | 8 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 44 | 21 | 1983 | 4 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 28 | 4 | 1998 | 2 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 1 | 2 | 1998 | 2 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.
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 (2025-12-31).