Snowflake 15 W Threshold Days by Year (USC00028018)
16 fixed thresholds counted per year at Snowflake 15 W (USC00028018): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Snowflake 15 W Thresholds
- Snowflake 15 W: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1984 with 14.
- Snowflake 15 W: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 1994 with 80.
- Snowflake 15 W: days with a maximum temperature at or above 90 F (32.2 C) in 31 years, most in 1994 with 46.
- Snowflake 15 W: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1970 with 172.
- 16 fixed thresholds have at least one qualifying day at Snowflake 15 W.
Days at or above 30 C (86 F)
31 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1966 | 46 | 36.8 |
| 1967 | 32 | 36.8 |
| 1968 | 36 | 36.8 |
| 1969 | 33 | 36.8 |
| 1970 | 51 | 46.1 |
| 1971 | 48 | 46.1 |
| 1972 | 36 | 46.1 |
| 1973 | 39 | 46.1 |
| 1974 | 56 | 46.1 |
| 1975 | 41 | 46.1 |
| 1976 | 27 | 46.1 |
| 1978 | 66 | 46.1 |
| 1979 | 51 | 46.1 |
| 1980 | 65 | 55.1 |
| 1981 | 54 | 55.1 |
| 1982 | 37 | 55.1 |
| 1983 | 61 | 55.1 |
| 1984 | 47 | 55.1 |
| 1985 | 58 | 55.1 |
| 1986 | 61 | 55.1 |
| 1987 | 48 | 55.1 |
| 1988 | 56 | 55.1 |
| 1989 | 64 | 55.1 |
| 1990 | 63 | 59.8 |
| 1991 | 41 | 59.8 |
| 1992 | 44 | 59.8 |
| 1993 | 60 | 59.8 |
| 1994 | 80 | 59.8 |
| 1995 | 59 | 59.8 |
| 1996 | 73 | 59.8 |
| 1997 | 58 | 59.8 |
| Year | First date | Last date |
|---|---|---|
| 1966 | 1966-06-14 | 1966-09-23 |
| 1967 | 1967-05-23 | 1967-09-05 |
| 1968 | 1968-06-04 | 1968-09-10 |
| 1969 | 1969-05-30 | 1969-08-28 |
| 1970 | 1970-05-19 | 1970-09-04 |
| 1971 | 1971-06-15 | 1971-09-17 |
| 1972 | 1972-06-20 | 1972-10-02 |
| 1973 | 1973-06-09 | 1973-09-08 |
| 1974 | 1974-05-27 | 1974-09-11 |
| 1975 | 1975-06-02 | 1975-09-02 |
| 1976 | 1976-06-19 | 1976-09-05 |
| 1978 | 1978-05-14 | 1978-10-01 |
| 1979 | 1979-06-13 | 1979-09-25 |
| 1980 | 1980-06-08 | 1980-09-23 |
| 1981 | 1981-06-07 | 1981-08-31 |
| 1982 | 1982-06-17 | 1982-09-26 |
| 1983 | 1983-05-24 | 1983-09-17 |
| 1984 | 1984-05-14 | 1984-09-10 |
| 1985 | 1985-06-07 | 1985-09-01 |
| 1986 | 1986-05-26 | 1986-09-07 |
| 1987 | 1987-06-11 | 1987-09-12 |
| 1988 | 1988-05-14 | 1988-09-11 |
| 1989 | 1989-05-07 | 1989-09-30 |
| 1990 | 1990-05-23 | 1990-09-15 |
| 1991 | 1991-06-09 | 1991-09-26 |
| 1992 | 1992-06-19 | 1992-09-19 |
| 1993 | 1993-06-12 | 1993-09-11 |
| 1994 | 1994-05-31 | 1994-09-29 |
| 1995 | 1995-06-12 | 1995-09-07 |
| 1996 | 1996-05-12 | 1996-10-11 |
| 1997 | 1997-05-14 | 1997-10-06 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 31 | 80 | 1994 | 58 |
| 35 C (95 F): Days | 26 | 15 | 1989 | 5 |
| 90 F (32.2 C): Days | 31 | 46 | 1994 | 21 |
| 100 F (37.8 C): Days | 4 | 2 | 1989 | 1 |
| 0 C (32 F): Ice days (max | 30 | 22 | 1992 | 9 |
| 0 C (32 F): Frost days (min | 31 | 172 | 1970 | 144 |
| -10 C (14 F): Days with min | 31 | 37 | 1968 | 20 |
| -20 C (-4 F): Days with min | 12 | 5 | 1971 | 1 |
| -30 C (-22 F): Days with min | 1 | 1 | 1971 | 1 |
| 20 C (68 F): Tropical nights (min | 17 | 5 | 1997 | 5 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 32 | 14 | 1984 | 9 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 26 | 5 | 1971 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 3 | 1 | 1968 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 19 | 5 | 1997 | 5 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1967 | 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 1966.
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).