Seattle NAS Threshold Days by Year (USW00024244)
11 fixed thresholds counted per year at Seattle NAS (USW00024244): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Seattle NAS Thresholds
- Seattle NAS: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1950 with 48.
- Seattle NAS: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1950 with 13.
- Seattle NAS: nights with a minimum temperature at or below 0 C (32 F) in 24 years, most in 1949 with 52.
- Seattle NAS: days with a maximum temperature at or above 30 C (86 F) in 23 years, most in 1958 with 19.
- 11 fixed thresholds have at least one qualifying day at Seattle NAS.
Days at or above 30 C (86 F)
23 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1946 | 4 | 2.5 |
| 1947 | 2 | 2.5 |
| 1948 | 2 | 2.5 |
| 1949 | 2 | 2.5 |
| 1950 | 3 | 7.3 |
| 1951 | 9 | 7.3 |
| 1952 | 10 | 7.3 |
| 1953 | 5 | 7.3 |
| 1955 | 4 | 7.3 |
| 1956 | 6 | 7.3 |
| 1957 | 2 | 7.3 |
| 1958 | 19 | 7.3 |
| 1959 | 8 | 7.3 |
| 1960 | 9 | 6.1 |
| 1961 | 6 | 6.1 |
| 1962 | 4 | 6.1 |
| 1963 | 3 | 6.1 |
| 1964 | 3 | 6.1 |
| 1965 | 7 | 6.1 |
| 1966 | 3 | 6.1 |
| 1967 | 14 | 6.1 |
| 1968 | 5 | 6.1 |
| 1969 | 7 | 6.1 |
| Year | First date | Last date |
|---|---|---|
| 1946 | 1946-07-20 | 1946-09-10 |
| 1947 | 1947-05-25 | 1947-05-26 |
| 1948 | 1948-06-07 | 1948-07-31 |
| 1949 | 1949-07-31 | 1949-08-01 |
| 1950 | 1950-08-20 | 1950-09-21 |
| 1951 | 1951-06-25 | 1951-09-15 |
| 1952 | 1952-07-08 | 1952-09-22 |
| 1953 | 1953-05-04 | 1953-08-18 |
| 1955 | 1955-06-08 | 1955-09-05 |
| 1956 | 1956-05-30 | 1956-09-06 |
| 1957 | 1957-08-22 | 1957-09-11 |
| 1958 | 1958-06-17 | 1958-08-24 |
| 1959 | 1959-07-09 | 1959-07-31 |
| 1960 | 1960-07-05 | 1960-08-09 |
| 1961 | 1961-07-11 | 1961-08-19 |
| 1962 | 1962-07-23 | 1962-07-28 |
| 1963 | 1963-05-20 | 1963-09-09 |
| 1964 | 1964-05-31 | 1964-08-24 |
| 1965 | 1965-07-06 | 1965-08-18 |
| 1966 | 1966-08-03 | 1966-08-21 |
| 1967 | 1967-06-19 | 1967-09-27 |
| 1968 | 1968-07-01 | 1968-08-01 |
| 1969 | 1969-05-22 | 1969-06-18 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 23 | 19 | 1958 | 7 |
| 35 C (95 F): Days | 5 | 2 | 1960 | 1 |
| 90 F (32.2 C): Days | 17 | 9 | 1958 | 2 |
| 0 C (32 F): Ice days (max | 16 | 18 | 1950 | 10 |
| 0 C (32 F): Frost days (min | 24 | 52 | 1949 | 26 |
| -10 C (14 F): Days with min | 5 | 12 | 1950 | 3 |
| 20 C (68 F): Tropical nights (min | 2 | 1 | 1956 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 30 | 48 | 1950 | 26 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 29 | 13 | 1950 | 6 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 3 | 1 | 1950 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 12 | 4 | 1969 | 4 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1946.
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).