Thunder Bay Wpcp Threshold Days by Year (CA00604HBFA)
15 fixed thresholds counted per year at Thunder Bay Wpcp (CA00604HBFA): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Thunder Bay Wpcp Thresholds
- Thunder Bay Wpcp: days with a maximum temperature at or below 0 C (32 F) in 23 years, most in 1972 with 130.
- Thunder Bay Wpcp: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1983 with 207.
- Thunder Bay Wpcp: nights with a minimum temperature at or below -10 C (14 F) in 23 years, most in 1978 with 119.
- Thunder Bay Wpcp: nights with a minimum temperature at or below -20 C (-4 F) in 23 years, most in 1972 with 69.
- 15 fixed thresholds have at least one qualifying day at Thunder Bay Wpcp.
Days at or above 30 C (86 F)
19 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1961 | 1 | 4.1 |
| 1963 | 4 | 4.1 |
| 1964 | 7 | 4.1 |
| 1965 | 4 | 4.1 |
| 1966 | 6 | 4.1 |
| 1968 | 1 | 4.1 |
| 1969 | 6 | 4.1 |
| 1970 | 10 | 3.8 |
| 1971 | 5 | 3.8 |
| 1972 | 2 | 3.8 |
| 1973 | 1 | 3.8 |
| 1974 | 2 | 3.8 |
| 1975 | 4 | 3.8 |
| 1976 | 6 | 3.8 |
| 1977 | 2 | 3.8 |
| 1979 | 2 | 3.8 |
| 1980 | 5 | 5.3 |
| 1981 | 5 | 5.3 |
| 1983 | 6 | 5.3 |
| Year | First date | Last date |
|---|---|---|
| 1961 | 1961-06-04 | 1961-06-04 |
| 1963 | 1963-07-01 | 1963-08-06 |
| 1964 | 1964-06-29 | 1964-08-03 |
| 1965 | 1965-06-11 | 1965-08-14 |
| 1966 | 1966-06-23 | 1966-07-18 |
| 1968 | 1968-07-06 | 1968-07-06 |
| 1969 | 1969-05-28 | 1969-08-27 |
| 1970 | 1970-06-06 | 1970-08-13 |
| 1971 | 1971-06-06 | 1971-08-28 |
| 1972 | 1972-06-07 | 1972-08-30 |
| 1973 | 1973-08-28 | 1973-08-28 |
| 1974 | 1974-07-13 | 1974-07-18 |
| 1975 | 1975-07-16 | 1975-07-30 |
| 1976 | 1976-06-10 | 1976-09-11 |
| 1977 | 1977-07-18 | 1977-07-23 |
| 1979 | 1979-07-18 | 1979-07-21 |
| 1980 | 1980-05-04 | 1980-07-09 |
| 1981 | 1981-07-05 | 1981-07-10 |
| 1983 | 1983-06-22 | 1983-09-02 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 19 | 10 | 1970 | 6 |
| 35 C (95 F): Days | 1 | 1 | 1983 | 1 |
| 90 F (32.2 C): Days | 12 | 4 | 1970 | 2 |
| 0 C (32 F): Ice days (max | 23 | 130 | 1972 | 95 |
| 0 C (32 F): Frost days (min | 23 | 207 | 1983 | 207 |
| -10 C (14 F): Days with min | 23 | 119 | 1978 | 90 |
| -20 C (-4 F): Days with min | 23 | 69 | 1972 | 38 |
| -30 C (-22 F): Days with min | 22 | 17 | 1982 | 4 |
| 20 C (68 F): Tropical nights (min | 1 | 1 | 1963 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 23 | 36 | 1968 | 25 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 22 | 9 | 1968 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 7 | 2 | 1971 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1977 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 20 | 9 | 1969 | 5 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 8 | 2 | 1977 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.
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).