Great Falls Threshold Days by Year (CA005031200)
18 fixed thresholds counted per year at Great Falls (CA005031200): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Great Falls Thresholds
- Great Falls: days with a maximum temperature at or below 0 C (32 F) in 59 years, most in 1933 with 146.
- Great Falls: nights with a minimum temperature at or below 0 C (32 F) in 59 years, most in 1945 with 214.
- Great Falls: nights with a minimum temperature at or below -10 C (14 F) in 59 years, most in 1936 with 147.
- Great Falls: nights with a minimum temperature at or below -20 C (-4 F) in 59 years, most in 1955 with 100.
- 18 fixed thresholds have at least one qualifying day at Great Falls.
Days at or above 30 C (86 F)
58 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1923 | 31 | 10.8 |
| 1924 | 5 | 10.8 |
| 1927 | 2 | 10.8 |
| 1928 | 4 | 10.8 |
| 1929 | 12 | 10.8 |
| 1930 | 11 | 14.7 |
| 1931 | 18 | 14.7 |
| 1932 | 13 | 14.7 |
| 1933 | 19 | 14.7 |
| 1934 | 11 | 14.7 |
| 1935 | 12 | 14.7 |
| 1936 | 20 | 14.7 |
| 1937 | 18 | 14.7 |
| 1938 | 11 | 14.7 |
| 1939 | 14 | 14.7 |
| 1940 | 19 | 12.6 |
| 1941 | 21 | 12.6 |
| 1942 | 4 | 12.6 |
| 1943 | 11 | 12.6 |
| 1944 | 7 | 12.6 |
| 1945 | 12 | 12.6 |
| 1946 | 8 | 12.6 |
| 1947 | 18 | 12.6 |
| 1948 | 8 | 12.6 |
| 1949 | 18 | 12.6 |
| 1950 | 4 | 9.7 |
| 1951 | 9 | 9.7 |
| 1952 | 13 | 9.7 |
| 1953 | 15 | 9.7 |
| 1954 | 6 | 9.7 |
| 1955 | 27 | 9.7 |
| 1956 | 4 | 9.7 |
| 1957 | 9 | 9.7 |
| 1958 | 3 | 9.7 |
| 1959 | 7 | 9.7 |
| 1960 | 10 | 9.3 |
| 1961 | 22 | 9.3 |
| 1962 | 2 | 9.3 |
| 1963 | 12 | 9.3 |
| 1964 | 10 | 9.3 |
| 1965 | 4 | 9.3 |
| 1966 | 11 | 9.3 |
| 1967 | 11 | 9.3 |
| 1968 | 3 | 9.3 |
| 1969 | 8 | 9.3 |
| 1970 | 15 | 9.6 |
| 1971 | 4 | 9.6 |
| 1972 | 9 | 9.6 |
| 1974 | 9 | 9.6 |
| 1975 | 13 | 9.6 |
| 1976 | 16 | 9.6 |
| 1977 | 8 | 9.6 |
| 1978 | 8 | 9.6 |
| 1979 | 4 | 9.6 |
| 1980 | 17 | 11.5 |
| 1981 | 4 | 11.5 |
| 1982 | 2 | 11.5 |
| 1983 | 23 | 11.5 |
| Year | First date | Last date |
|---|---|---|
| 1923 | 1923-05-27 | 1923-07-27 |
| 1924 | 1924-07-03 | 1924-08-25 |
| 1927 | 1927-09-04 | 1927-09-14 |
| 1928 | 1928-05-23 | 1928-08-15 |
| 1929 | 1929-07-11 | 1929-09-01 |
| 1930 | 1930-05-21 | 1930-08-30 |
| 1931 | 1931-06-17 | 1931-09-12 |
| 1932 | 1932-06-04 | 1932-09-08 |
| 1933 | 1933-06-01 | 1933-08-20 |
| 1934 | 1934-05-26 | 1934-08-17 |
| 1935 | 1935-07-01 | 1935-08-15 |
| 1936 | 1936-06-24 | 1936-09-03 |
| 1937 | 1937-05-28 | 1937-08-27 |
| 1938 | 1938-06-19 | 1938-08-18 |
| 1939 | 1939-05-29 | 1939-08-18 |
| 1940 | 1940-07-04 | 1940-09-05 |
| 1941 | 1941-05-18 | 1941-09-01 |
| 1942 | 1942-07-17 | 1942-08-20 |
| 1943 | 1943-06-23 | 1943-08-30 |
| 1944 | 1944-05-28 | 1944-07-30 |
| 1945 | 1945-06-21 | 1945-09-05 |
| 1946 | 1946-07-08 | 1946-08-02 |
| 1947 | 1947-07-02 | 1947-08-22 |
| 1948 | 1948-05-19 | 1948-09-04 |
| 1949 | 1949-05-31 | 1949-08-21 |
| 1950 | 1950-07-07 | 1950-07-29 |
| 1951 | 1951-05-23 | 1951-07-29 |
| 1952 | 1952-04-27 | 1952-09-27 |
| 1953 | 1953-05-07 | 1953-08-31 |
| 1954 | 1954-06-23 | 1954-07-28 |
| 1955 | 1955-05-20 | 1955-09-05 |
| 1956 | 1956-06-09 | 1956-06-21 |
| 1957 | 1957-07-10 | 1957-08-06 |
| 1958 | 1958-07-21 | 1958-07-31 |
| 1959 | 1959-07-19 | 1959-08-28 |
| 1960 | 1960-07-08 | 1960-09-03 |
| 1961 | 1961-06-06 | 1961-10-06 |
| 1962 | 1962-06-27 | 1962-06-28 |
| 1963 | 1963-06-28 | 1963-08-20 |
| 1964 | 1964-05-21 | 1964-08-01 |
| 1965 | 1965-08-04 | 1965-08-13 |
| 1966 | 1966-06-29 | 1966-08-28 |
| 1967 | 1967-07-19 | 1967-09-06 |
| 1968 | 1968-07-06 | 1968-09-12 |
| 1969 | 1969-05-26 | 1969-08-23 |
| 1970 | 1970-06-05 | 1970-09-06 |
| 1971 | 1971-08-06 | 1971-08-15 |
| 1972 | 1972-05-16 | 1972-08-30 |
| 1974 | 1974-06-25 | 1974-08-06 |
| 1975 | 1975-06-24 | 1975-07-31 |
| 1976 | 1976-06-05 | 1976-09-07 |
| 1977 | 1977-05-11 | 1977-07-23 |
| 1978 | 1978-06-18 | 1978-09-05 |
| 1979 | 1979-07-09 | 1979-07-20 |
| 1980 | 1980-04-21 | 1980-08-19 |
| 1981 | 1981-07-04 | 1981-07-07 |
| 1982 | 1982-07-04 | 1982-09-09 |
| 1983 | 1983-06-11 | 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 | 58 | 31 | 1923 | 23 |
| 35 C (95 F): Days | 20 | 6 | 1936 | 2 |
| 40 C (104 F): Days | 1 | 1 | 1936 | 1 |
| 90 F (32.2 C): Days | 52 | 15 | 1923 | 6 |
| 100 F (37.8 C): Days | 2 | 4 | 1936 | 2 |
| 0 C (32 F): Ice days (max | 59 | 146 | 1933 | 112 |
| 0 C (32 F): Frost days (min | 59 | 214 | 1945 | 181 |
| -10 C (14 F): Days with min | 59 | 147 | 1936 | 86 |
| -20 C (-4 F): Days with min | 59 | 100 | 1955 | 40 |
| -30 C (-22 F): Days with min | 59 | 41 | 1936 | 10 |
| -40 C (-40 F): Days with min | 26 | 9 | 1933 | 1 |
| 20 C (68 F): Tropical nights (min | 51 | 15 | 1936 | 12 |
| 25 C (77 F): Days with min | 1 | 1 | 1936 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 50 | 21 | 1955 | 10 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 42 | 6 | 1949 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 9 | 2 | 1973 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 43 | 9 | 1955 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 7 | 1 | 1938 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1923.
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).