Grand River Lock Threshold Days by Year (USC00473214)
19 fixed thresholds counted per year at Grand River Lock (USC00473214): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Grand River Lock Thresholds
- Grand River Lock: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1938 with 35.
- Grand River Lock: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1938 with 12.
- Grand River Lock: nights with a minimum temperature at or below 0 C (32 F) in 45 years, most in 1952 with 180.
- Grand River Lock: nights with a minimum temperature at or below -10 C (14 F) in 45 years, most in 1950 with 84.
- 19 fixed thresholds have at least one qualifying day at Grand River Lock.
Days at or above 30 C (86 F)
44 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1909 | 36 | 36 |
| 1910 | 56 | 31.6 |
| 1912 | 25 | 31.6 |
| 1913 | 34 | 31.6 |
| 1914 | 36 | 31.6 |
| 1915 | 8 | 31.6 |
| 1916 | 44 | 31.6 |
| 1917 | 19 | 31.6 |
| 1918 | 27 | 31.6 |
| 1919 | 35 | 31.6 |
| 1920 | 23 | 30.4 |
| 1921 | 55 | 30.4 |
| 1922 | 30 | 30.4 |
| 1923 | 38 | 30.4 |
| 1924 | 11 | 30.4 |
| 1925 | 42 | 30.4 |
| 1926 | 21 | 30.4 |
| 1927 | 27 | 30.4 |
| 1928 | 20 | 30.4 |
| 1929 | 37 | 30.4 |
| 1930 | 54 | 45.4 |
| 1931 | 57 | 45.4 |
| 1932 | 32 | 45.4 |
| 1933 | 47 | 45.4 |
| 1934 | 58 | 45.4 |
| 1935 | 26 | 45.4 |
| 1936 | 55 | 45.4 |
| 1937 | 51 | 45.4 |
| 1938 | 27 | 45.4 |
| 1939 | 47 | 45.4 |
| 1940 | 33 | 35.2 |
| 1941 | 43 | 35.2 |
| 1942 | 22 | 35.2 |
| 1943 | 44 | 35.2 |
| 1944 | 41 | 35.2 |
| 1945 | 24 | 35.2 |
| 1946 | 28 | 35.2 |
| 1947 | 44 | 35.2 |
| 1948 | 40 | 35.2 |
| 1949 | 33 | 35.2 |
| 1950 | 10 | 19.5 |
| 1951 | 8 | 19.5 |
| 1952 | 35 | 19.5 |
| 1953 | 25 | 19.5 |
| Year | First date | Last date |
|---|---|---|
| 1909 | 1909-05-05 | 1909-08-26 |
| 1910 | 1910-06-13 | 1910-08-25 |
| 1912 | 1912-06-23 | 1912-09-09 |
| 1913 | 1913-05-02 | 1913-09-08 |
| 1914 | 1914-05-25 | 1914-09-20 |
| 1915 | 1915-07-12 | 1915-09-13 |
| 1916 | 1916-05-26 | 1916-09-06 |
| 1917 | 1917-05-17 | 1917-08-22 |
| 1918 | 1918-05-03 | 1918-08-25 |
| 1919 | 1919-05-30 | 1919-09-09 |
| 1920 | 1920-06-08 | 1920-09-26 |
| 1921 | 1921-05-20 | 1921-09-01 |
| 1922 | 1922-05-10 | 1922-10-05 |
| 1923 | 1923-06-01 | 1923-09-06 |
| 1924 | 1924-07-20 | 1924-08-31 |
| 1925 | 1925-04-23 | 1925-09-20 |
| 1926 | 1926-05-01 | 1926-09-18 |
| 1927 | 1927-05-21 | 1927-09-17 |
| 1928 | 1928-05-09 | 1928-08-28 |
| 1929 | 1929-05-15 | 1929-09-04 |
| 1930 | 1930-04-10 | 1930-09-24 |
| 1931 | 1931-06-18 | 1931-09-21 |
| 1932 | 1932-05-14 | 1932-09-19 |
| 1933 | 1933-06-03 | 1933-09-09 |
| 1934 | 1934-05-06 | 1934-09-25 |
| 1935 | 1935-07-03 | 1935-09-24 |
| 1936 | 1936-05-09 | 1936-09-23 |
| 1937 | 1937-05-30 | 1937-09-24 |
| 1938 | 1938-06-20 | 1938-09-04 |
| 1939 | 1939-05-19 | 1939-09-28 |
| 1940 | 1940-06-02 | 1940-09-20 |
| 1941 | 1941-05-20 | 1941-09-22 |
| 1942 | 1942-06-10 | 1942-09-11 |
| 1943 | 1943-06-03 | 1943-09-01 |
| 1944 | 1944-05-28 | 1944-09-03 |
| 1945 | 1945-06-23 | 1945-09-07 |
| 1946 | 1946-06-16 | 1946-08-17 |
| 1947 | 1947-06-28 | 1947-10-15 |
| 1948 | 1948-05-20 | 1948-09-19 |
| 1949 | 1949-05-03 | 1949-08-26 |
| 1950 | 1950-05-24 | 1950-08-16 |
| 1951 | 1951-07-23 | 1951-08-30 |
| 1952 | 1952-04-28 | 1952-09-28 |
| 1953 | 1953-05-30 | 1953-09-29 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 44 | 58 | 1934 | 25 |
| 35 C (95 F): Days | 30 | 18 | 1931 | 2 |
| 40 C (104 F): Days | 3 | 4 | 1936 | 4 |
| 90 F (32.2 C): Days | 42 | 40 | 1931 | 14 |
| 100 F (37.8 C): Days | 8 | 7 | 1936 | 1 |
| 0 C (32 F): Ice days (max | 44 | 84 | 1950 | 45 |
| 0 C (32 F): Frost days (min | 45 | 180 | 1952 | 155 |
| -10 C (14 F): Days with min | 45 | 84 | 1950 | 50 |
| -20 C (-4 F): Days with min | 45 | 39 | 1929 | 3 |
| -30 C (-22 F): Days with min | 28 | 11 | 1936 | 8 |
| -40 C (-40 F): Days with min | 3 | 1 | 1918 | 1 |
| 20 C (68 F): Tropical nights (min | 45 | 23 | 1931 | 8 |
| 25 C (77 F): Days with min | 5 | 4 | 1931 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 47 | 35 | 1938 | 30 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 47 | 12 | 1938 | 9 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 17 | 4 | 1912 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1938 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 14 | 4 | 1913 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1929 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1909.
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).