Great Falls Threshold Days by Year (USC00183850)
17 fixed thresholds counted per year at Great Falls (USC00183850): 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 10 mm (0.39 in) or more of precipitation in 46 years, most in 1937 with 49.
- Great Falls: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1937 with 15.
- Great Falls: days with a maximum temperature at or above 30 C (86 F) in 45 years, most in 1930 with 102.
- Great Falls: days with a maximum temperature at or above 35 C (95 F) in 45 years, most in 1930 with 37.
- 17 fixed thresholds have at least one qualifying day at Great Falls.
Days at or above 30 C (86 F)
45 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1899 | 64 | 64 |
| 1900 | 78 | 60.8 |
| 1901 | 51 | 60.8 |
| 1902 | 70 | 60.8 |
| 1903 | 53 | 60.8 |
| 1904 | 60 | 60.8 |
| 1905 | 65 | 60.8 |
| 1907 | 50 | 60.8 |
| 1908 | 67 | 60.8 |
| 1909 | 53 | 60.8 |
| 1910 | 57 | 60.3 |
| 1912 | 60 | 60.3 |
| 1913 | 56 | 60.3 |
| 1914 | 68 | 60.3 |
| 1915 | 64 | 60.3 |
| 1917 | 57 | 60.3 |
| 1920 | 45 | 64 |
| 1921 | 72 | 64 |
| 1922 | 71 | 64 |
| 1923 | 65 | 64 |
| 1924 | 49 | 64 |
| 1925 | 80 | 64 |
| 1926 | 70 | 64 |
| 1927 | 48 | 64 |
| 1928 | 64 | 64 |
| 1929 | 76 | 64 |
| 1930 | 102 | 77.8 |
| 1931 | 82 | 77.8 |
| 1932 | 72 | 77.8 |
| 1933 | 73 | 77.8 |
| 1935 | 60 | 77.8 |
| 1936 | 71 | 77.8 |
| 1937 | 68 | 77.8 |
| 1938 | 81 | 77.8 |
| 1939 | 91 | 77.8 |
| 1940 | 58 | 69.3 |
| 1941 | 83 | 69.3 |
| 1942 | 71 | 69.3 |
| 1943 | 85 | 69.3 |
| 1944 | 72 | 69.3 |
| 1945 | 73 | 69.3 |
| 1946 | 60 | 69.3 |
| 1947 | 71 | 69.3 |
| 1948 | 52 | 69.3 |
| 1949 | 68 | 69.3 |
| Year | First date | Last date |
|---|---|---|
| 1899 | 1899-05-02 | 1899-09-09 |
| 1900 | 1900-05-09 | 1900-09-28 |
| 1901 | 1901-06-06 | 1901-09-17 |
| 1902 | 1902-04-23 | 1902-09-25 |
| 1903 | 1903-04-30 | 1903-09-17 |
| 1904 | 1904-05-14 | 1904-10-10 |
| 1905 | 1905-05-04 | 1905-10-05 |
| 1907 | 1907-03-22 | 1907-09-21 |
| 1908 | 1908-04-23 | 1908-09-23 |
| 1909 | 1909-04-19 | 1909-09-22 |
| 1910 | 1910-04-05 | 1910-10-06 |
| 1912 | 1912-05-20 | 1912-10-11 |
| 1913 | 1913-05-03 | 1913-09-08 |
| 1914 | 1914-05-11 | 1914-10-10 |
| 1915 | 1915-04-19 | 1915-09-17 |
| 1917 | 1917-04-01 | 1917-09-02 |
| 1920 | 1920-05-11 | 1920-09-26 |
| 1921 | 1921-03-21 | 1921-09-29 |
| 1922 | 1922-04-09 | 1922-10-06 |
| 1923 | 1923-04-21 | 1923-09-25 |
| 1924 | 1924-05-06 | 1924-09-13 |
| 1925 | 1925-04-23 | 1925-09-21 |
| 1926 | 1926-04-22 | 1926-10-05 |
| 1927 | 1927-04-20 | 1927-10-02 |
| 1928 | 1928-05-04 | 1928-10-13 |
| 1929 | 1929-04-07 | 1929-09-29 |
| 1930 | 1930-04-11 | 1930-09-26 |
| 1931 | 1931-05-16 | 1931-10-08 |
| 1932 | 1932-05-07 | 1932-09-05 |
| 1933 | 1933-05-13 | 1933-10-01 |
| 1935 | 1935-04-27 | 1935-09-21 |
| 1936 | 1936-04-21 | 1936-09-23 |
| 1937 | 1937-04-18 | 1937-09-04 |
| 1938 | 1938-03-22 | 1938-09-27 |
| 1939 | 1939-04-25 | 1939-10-10 |
| 1940 | 1940-05-06 | 1940-10-13 |
| 1941 | 1941-04-14 | 1941-10-08 |
| 1942 | 1942-04-06 | 1942-10-10 |
| 1943 | 1943-05-06 | 1943-09-16 |
| 1944 | 1944-06-01 | 1944-10-07 |
| 1945 | 1945-03-16 | 1945-09-29 |
| 1946 | 1946-04-22 | 1946-10-31 |
| 1947 | 1947-05-13 | 1947-10-23 |
| 1948 | 1948-03-21 | 1948-09-20 |
| 1949 | 1949-04-14 | 1949-10-13 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 45 | 102 | 1930 | 68 |
| 35 C (95 F): Days | 45 | 37 | 1930 | 12 |
| 40 C (104 F): Days | 4 | 7 | 1930 | 1 |
| 90 F (32.2 C): Days | 45 | 64 | 1930 | 34 |
| 100 F (37.8 C): Days | 17 | 15 | 1930 | 1 |
| 0 C (32 F): Ice days (max | 43 | 26 | 1902 | 17 |
| 0 C (32 F): Frost days (min | 43 | 143 | 1904 | 103 |
| -10 C (14 F): Days with min | 43 | 32 | 1904 | 4 |
| -20 C (-4 F): Days with min | 14 | 5 | 1899 | 2 |
| 20 C (68 F): Tropical nights (min | 43 | 47 | 1900 | 37 |
| 25 C (77 F): Days with min | 1 | 1 | 1930 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 46 | 49 | 1937 | 40 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 46 | 15 | 1937 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 34 | 8 | 1937 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1933 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 4 | 2 | 1947 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1947 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.
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).