Thunder Bay A Threshold Days by Year (CA006048261)
19 fixed thresholds counted per year at Thunder Bay A (CA006048261): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Thunder Bay A Thresholds
- Thunder Bay A: days with a maximum temperature at or below 0 C (32 F) in 42 years, most in 1972 with 128.
- Thunder Bay A: nights with a minimum temperature at or below 0 C (32 F) in 42 years, most in 1976 with 235.
- Thunder Bay A: nights with a minimum temperature at or below -10 C (14 F) in 42 years, most in 1950 with 127.
- Thunder Bay A: nights with a minimum temperature at or below -20 C (-4 F) in 42 years, most in 1963 with 72.
- 19 fixed thresholds have at least one qualifying day at Thunder Bay A.
Days at or above 30 C (86 F)
41 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1942 | 7 | 6.6 |
| 1943 | 6 | 6.6 |
| 1944 | 6 | 6.6 |
| 1945 | 7 | 6.6 |
| 1946 | 5 | 6.6 |
| 1947 | 8 | 6.6 |
| 1948 | 8 | 6.6 |
| 1949 | 6 | 6.6 |
| 1950 | 1 | 6.4 |
| 1951 | 4 | 6.4 |
| 1952 | 1 | 6.4 |
| 1953 | 8 | 6.4 |
| 1954 | 6 | 6.4 |
| 1955 | 19 | 6.4 |
| 1956 | 5 | 6.4 |
| 1957 | 9 | 6.4 |
| 1958 | 3 | 6.4 |
| 1959 | 8 | 6.4 |
| 1960 | 8 | 6 |
| 1961 | 4 | 6 |
| 1962 | 2 | 6 |
| 1963 | 6 | 6 |
| 1964 | 10 | 6 |
| 1965 | 4 | 6 |
| 1966 | 11 | 6 |
| 1968 | 1 | 6 |
| 1969 | 8 | 6 |
| 1970 | 17 | 7.6 |
| 1971 | 9 | 7.6 |
| 1972 | 4 | 7.6 |
| 1973 | 5 | 7.6 |
| 1974 | 3 | 7.6 |
| 1975 | 9 | 7.6 |
| 1976 | 17 | 7.6 |
| 1977 | 6 | 7.6 |
| 1978 | 4 | 7.6 |
| 1979 | 2 | 7.6 |
| 1980 | 7 | 7.5 |
| 1981 | 8 | 7.5 |
| 1982 | 1 | 7.5 |
| 1983 | 14 | 7.5 |
| Year | First date | Last date |
|---|---|---|
| 1942 | 1942-07-11 | 1942-08-30 |
| 1943 | 1943-06-24 | 1943-07-25 |
| 1944 | 1944-05-28 | 1944-08-10 |
| 1945 | 1945-06-22 | 1945-09-06 |
| 1946 | 1946-06-16 | 1946-08-08 |
| 1947 | 1947-07-16 | 1947-08-24 |
| 1948 | 1948-05-26 | 1948-08-26 |
| 1949 | 1949-06-11 | 1949-08-09 |
| 1950 | 1950-06-23 | 1950-06-23 |
| 1951 | 1951-07-24 | 1951-07-29 |
| 1952 | 1952-08-24 | 1952-08-24 |
| 1953 | 1953-05-07 | 1953-08-31 |
| 1954 | 1954-06-24 | 1954-08-24 |
| 1955 | 1955-06-15 | 1955-09-03 |
| 1956 | 1956-06-08 | 1956-06-21 |
| 1957 | 1957-07-13 | 1957-08-10 |
| 1958 | 1958-07-24 | 1958-08-02 |
| 1959 | 1959-06-08 | 1959-09-07 |
| 1960 | 1960-06-27 | 1960-08-31 |
| 1961 | 1961-06-04 | 1961-08-04 |
| 1962 | 1962-05-17 | 1962-06-28 |
| 1963 | 1963-07-01 | 1963-08-06 |
| 1964 | 1964-06-26 | 1964-08-03 |
| 1965 | 1965-06-11 | 1965-08-14 |
| 1966 | 1966-06-23 | 1966-08-26 |
| 1968 | 1968-07-06 | 1968-07-06 |
| 1969 | 1969-05-28 | 1969-08-27 |
| 1970 | 1970-06-06 | 1970-08-14 |
| 1971 | 1971-06-03 | 1971-09-02 |
| 1972 | 1972-05-19 | 1972-08-30 |
| 1973 | 1973-07-06 | 1973-08-29 |
| 1974 | 1974-07-13 | 1974-08-06 |
| 1975 | 1975-06-30 | 1975-08-01 |
| 1976 | 1976-06-03 | 1976-09-18 |
| 1977 | 1977-05-12 | 1977-07-23 |
| 1978 | 1978-05-18 | 1978-08-14 |
| 1979 | 1979-07-10 | 1979-07-21 |
| 1980 | 1980-05-04 | 1980-07-09 |
| 1981 | 1981-07-05 | 1981-08-14 |
| 1982 | 1982-07-17 | 1982-07-17 |
| 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 | 41 | 19 | 1955 | 14 |
| 35 C (95 F): Days | 7 | 2 | 1955 | 1 |
| 40 C (104 F): Days | 1 | 1 | 1983 | 1 |
| 90 F (32.2 C): Days | 27 | 7 | 1955 | 5 |
| 100 F (37.8 C): Days | 1 | 1 | 1983 | 1 |
| 0 C (32 F): Ice days (max | 42 | 128 | 1972 | 100 |
| 0 C (32 F): Frost days (min | 42 | 235 | 1976 | 211 |
| -10 C (14 F): Days with min | 42 | 127 | 1950 | 87 |
| -20 C (-4 F): Days with min | 42 | 72 | 1963 | 40 |
| -30 C (-22 F): Days with min | 41 | 20 | 1982 | 3 |
| -40 C (-40 F): Days with min | 4 | 3 | 1951 | 1 |
| 20 C (68 F): Tropical nights (min | 3 | 2 | 1947 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 42 | 34 | 1950 | 26 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 40 | 10 | 1977 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 14 | 3 | 1973 | 1 |
| 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 | 40 | 12 | 1950 | 6 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 14 | 3 | 1956 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1956 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.
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).