Blue Threshold Days by Year (USC00020855)
16 fixed thresholds counted per year at Blue (USC00020855): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Blue Thresholds
- Blue: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1983 with 32.
- Blue: days with 25 mm (0.98 in) or more of precipitation in 49 years, most in 1916 with 10.
- Blue: days with 10 cm (3.9 in) or more of snowfall in 39 years, most in 1918 with 10.
- Blue: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1970 with 218.
- 16 fixed thresholds have at least one qualifying day at Blue.
Days at or above 30 C (86 F)
28 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1904 | 75 | 67.3 |
| 1905 | 70 | 67.3 |
| 1906 | 57 | 67.3 |
| 1960 | 99 | 72.1 |
| 1961 | 75 | 72.1 |
| 1962 | 81 | 72.1 |
| 1963 | 56 | 72.1 |
| 1964 | 78 | 72.1 |
| 1965 | 61 | 72.1 |
| 1966 | 71 | 72.1 |
| 1967 | 54 | 72.1 |
| 1968 | 51 | 72.1 |
| 1969 | 95 | 72.1 |
| 1970 | 86 | 70.6 |
| 1971 | 71 | 70.6 |
| 1972 | 56 | 70.6 |
| 1973 | 76 | 70.6 |
| 1974 | 72 | 70.6 |
| 1975 | 67 | 70.6 |
| 1976 | 65 | 70.6 |
| 1977 | 72 | 70.6 |
| 1980 | 83 | 59.3 |
| 1981 | 33 | 59.3 |
| 1982 | 59 | 59.3 |
| 1983 | 60 | 59.3 |
| 1984 | 59 | 59.3 |
| 1987 | 60 | 59.3 |
| 1988 | 61 | 59.3 |
| Year | First date | Last date |
|---|---|---|
| 1904 | 1904-05-06 | 1904-09-01 |
| 1905 | 1905-05-16 | 1905-09-15 |
| 1906 | 1906-02-24 | 1906-09-05 |
| 1960 | 1960-05-09 | 1960-09-28 |
| 1961 | 1961-05-02 | 1961-09-27 |
| 1962 | 1962-04-17 | 1962-09-19 |
| 1963 | 1963-05-17 | 1963-10-02 |
| 1964 | 1964-05-15 | 1964-09-08 |
| 1965 | 1965-04-21 | 1965-10-11 |
| 1966 | 1966-05-17 | 1966-09-23 |
| 1967 | 1967-05-08 | 1967-09-20 |
| 1968 | 1968-05-26 | 1968-09-13 |
| 1969 | 1969-05-19 | 1969-10-02 |
| 1970 | 1970-05-14 | 1970-09-11 |
| 1971 | 1971-06-06 | 1971-09-17 |
| 1972 | 1972-03-23 | 1972-10-01 |
| 1973 | 1973-05-11 | 1973-09-22 |
| 1974 | 1974-05-11 | 1974-08-31 |
| 1975 | 1975-05-14 | 1975-09-15 |
| 1976 | 1976-05-13 | 1976-09-04 |
| 1977 | 1977-05-27 | 1977-09-25 |
| 1980 | 1980-06-04 | 1980-10-05 |
| 1981 | 1981-06-08 | 1981-09-02 |
| 1982 | 1982-05-24 | 1982-09-25 |
| 1983 | 1983-05-22 | 1983-09-12 |
| 1984 | 1984-05-09 | 1984-09-14 |
| 1987 | 1987-06-02 | 1987-10-08 |
| 1988 | 1988-05-12 | 1988-09-11 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 28 | 99 | 1960 | 61 |
| 35 C (95 F): Days | 27 | 28 | 1961 | 2 |
| 40 C (104 F): Days | 5 | 2 | 1970 | 2 |
| 90 F (32.2 C): Days | 28 | 70 | 1960 | 20 |
| 100 F (37.8 C): Days | 17 | 9 | 1972 | 4 |
| 0 C (32 F): Ice days (max | 8 | 4 | 1987 | 4 |
| 0 C (32 F): Frost days (min | 29 | 218 | 1970 | 151 |
| -10 C (14 F): Days with min | 29 | 54 | 1964 | 10 |
| -20 C (-4 F): Days with min | 7 | 5 | 1971 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 50 | 32 | 1983 | 16 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 49 | 10 | 1916 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 15 | 2 | 1965 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1972 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 39 | 10 | 1918 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 13 | 2 | 1961 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1967 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.
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).