Upper San Leandro Filters Threshold Days by Year (USC00049185)
11 fixed thresholds counted per year at Upper San Leandro Filters (USC00049185): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Upper San Leandro Filters Thresholds
- Upper San Leandro Filters: days with 10 mm (0.39 in) or more of precipitation in 68 years, most in 1983 with 46.
- Upper San Leandro Filters: days with 25 mm (0.98 in) or more of precipitation in 68 years, most in 1983 with 15.
- Upper San Leandro Filters: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1982 with 4.
- Upper San Leandro Filters: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1961 with 32.
- 11 fixed thresholds have at least one qualifying day at Upper San Leandro Filters.
Days at or above 30 C (86 F)
30 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1959 | 24 | 24 |
| 1960 | 19 | 14.7 |
| 1961 | 32 | 14.7 |
| 1962 | 9 | 14.7 |
| 1963 | 7 | 14.7 |
| 1964 | 17 | 14.7 |
| 1965 | 10 | 14.7 |
| 1966 | 15 | 14.7 |
| 1967 | 12 | 14.7 |
| 1968 | 17 | 14.7 |
| 1969 | 9 | 14.7 |
| 1970 | 15 | 18.1 |
| 1971 | 14 | 18.1 |
| 1972 | 8 | 18.1 |
| 1973 | 16 | 18.1 |
| 1974 | 15 | 18.1 |
| 1975 | 14 | 18.1 |
| 1976 | 26 | 18.1 |
| 1977 | 19 | 18.1 |
| 1978 | 30 | 18.1 |
| 1979 | 24 | 18.1 |
| 1980 | 19 | 18.6 |
| 1981 | 19 | 18.6 |
| 1982 | 8 | 18.6 |
| 1983 | 20 | 18.6 |
| 1984 | 31 | 18.6 |
| 1985 | 19 | 18.6 |
| 1986 | 9 | 18.6 |
| 1987 | 23 | 18.6 |
| 1989 | 19 | 18.6 |
| Year | First date | Last date |
|---|---|---|
| 1959 | 1959-05-08 | 1959-10-25 |
| 1960 | 1960-04-05 | 1960-09-26 |
| 1961 | 1961-04-04 | 1961-10-17 |
| 1962 | 1962-04-12 | 1962-10-02 |
| 1963 | 1963-07-27 | 1963-09-27 |
| 1964 | 1964-04-15 | 1964-10-21 |
| 1965 | 1965-04-27 | 1965-10-26 |
| 1966 | 1966-04-16 | 1966-11-02 |
| 1967 | 1967-05-16 | 1967-11-03 |
| 1968 | 1968-04-27 | 1968-09-28 |
| 1969 | 1969-07-20 | 1969-09-26 |
| 1970 | 1970-05-16 | 1970-10-02 |
| 1971 | 1971-06-16 | 1971-10-13 |
| 1972 | 1972-05-13 | 1972-10-06 |
| 1973 | 1973-06-07 | 1973-09-29 |
| 1974 | 1974-05-27 | 1974-10-18 |
| 1975 | 1975-05-29 | 1975-09-25 |
| 1976 | 1976-05-13 | 1976-11-06 |
| 1977 | 1977-06-06 | 1977-10-14 |
| 1978 | 1978-05-14 | 1978-10-24 |
| 1979 | 1979-05-13 | 1979-10-01 |
| 1980 | 1980-06-28 | 1980-10-09 |
| 1981 | 1981-04-29 | 1981-10-01 |
| 1982 | 1982-05-24 | 1982-09-13 |
| 1983 | 1983-05-20 | 1983-10-27 |
| 1984 | 1984-04-15 | 1984-09-29 |
| 1985 | 1985-04-03 | 1985-10-05 |
| 1986 | 1986-05-18 | 1986-10-06 |
| 1987 | 1987-04-16 | 1987-10-07 |
| 1989 | 1989-04-07 | 1989-10-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 30 | 32 | 1961 | 19 |
| 35 C (95 F): Days | 23 | 7 | 1973 | 2 |
| 40 C (104 F): Days | 3 | 1 | 1960 | 1 |
| 90 F (32.2 C): Days | 30 | 19 | 1984 | 12 |
| 100 F (37.8 C): Days | 12 | 3 | 1971 | 2 |
| 0 C (32 F): Frost days (min | 22 | 19 | 1976 | 8 |
| 20 C (68 F): Tropical nights (min | 1 | 2 | 1984 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 68 | 46 | 1983 | 11 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 68 | 15 | 1983 | 3 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 42 | 4 | 1982 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 5 | 1 | 1962 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.
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).