Rockford Threshold Days by Year (USC00117375)
20 fixed thresholds counted per year at Rockford (USC00117375): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rockford Thresholds
- Rockford: days with 10 mm (0.39 in) or more of precipitation in 51 years, most in 1941 with 44.
- Rockford: days with a maximum temperature at or above 30 C (86 F) in 50 years, most in 1921 with 84.
- Rockford: days with a maximum temperature at or above 90 F (32.2 C) in 50 years, most in 1921 with 62.
- Rockford: days with a maximum temperature at or below 0 C (32 F) in 50 years, most in 1912 with 75.
- 20 fixed thresholds have at least one qualifying day at Rockford.
Days at or above 30 C (86 F)
50 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1896 | 59 | 56 |
| 1897 | 53 | 56 |
| 1906 | 39 | 31 |
| 1907 | 18 | 31 |
| 1908 | 37 | 31 |
| 1909 | 30 | 31 |
| 1910 | 43 | 43.5 |
| 1911 | 46 | 43.5 |
| 1912 | 29 | 43.5 |
| 1913 | 52 | 43.5 |
| 1914 | 58 | 43.5 |
| 1915 | 27 | 43.5 |
| 1916 | 58 | 43.5 |
| 1917 | 33 | 43.5 |
| 1918 | 36 | 43.5 |
| 1919 | 53 | 43.5 |
| 1921 | 84 | 53.2 |
| 1922 | 65 | 53.2 |
| 1923 | 63 | 53.2 |
| 1924 | 25 | 53.2 |
| 1925 | 58 | 53.2 |
| 1926 | 41 | 53.2 |
| 1927 | 49 | 53.2 |
| 1928 | 47 | 53.2 |
| 1929 | 47 | 53.2 |
| 1930 | 68 | 66.3 |
| 1931 | 69 | 66.3 |
| 1932 | 56 | 66.3 |
| 1933 | 72 | 66.3 |
| 1934 | 79 | 66.3 |
| 1935 | 53 | 66.3 |
| 1936 | 77 | 66.3 |
| 1937 | 68 | 66.3 |
| 1938 | 53 | 66.3 |
| 1939 | 68 | 66.3 |
| 1940 | 49 | 52.8 |
| 1941 | 60 | 52.8 |
| 1942 | 44 | 52.8 |
| 1943 | 55 | 52.8 |
| 1944 | 57 | 52.8 |
| 1945 | 35 | 52.8 |
| 1948 | 58 | 52.8 |
| 1949 | 64 | 52.8 |
| 1950 | 32 | 47.1 |
| 1951 | 22 | 47.1 |
| 1952 | 58 | 47.1 |
| 1953 | 68 | 47.1 |
| 1954 | 51 | 47.1 |
| 1955 | 62 | 47.1 |
| 1956 | 37 | 47.1 |
| Year | First date | Last date |
|---|---|---|
| 1896 | 1896-05-06 | 1896-09-10 |
| 1897 | 1897-06-13 | 1897-10-15 |
| 1906 | 1906-05-17 | 1906-09-19 |
| 1907 | 1907-06-16 | 1907-09-02 |
| 1908 | 1908-05-28 | 1908-09-26 |
| 1909 | 1909-05-06 | 1909-08-27 |
| 1910 | 1910-04-30 | 1910-08-25 |
| 1911 | 1911-05-11 | 1911-09-15 |
| 1912 | 1912-05-24 | 1912-09-11 |
| 1913 | 1913-06-15 | 1913-09-08 |
| 1914 | 1914-05-25 | 1914-09-22 |
| 1915 | 1915-04-20 | 1915-09-15 |
| 1916 | 1916-05-26 | 1916-10-08 |
| 1917 | 1917-05-18 | 1917-09-16 |
| 1918 | 1918-05-04 | 1918-08-28 |
| 1919 | 1919-05-30 | 1919-09-20 |
| 1921 | 1921-05-19 | 1921-09-20 |
| 1922 | 1922-05-10 | 1922-10-05 |
| 1923 | 1923-05-27 | 1923-09-26 |
| 1924 | 1924-05-05 | 1924-09-21 |
| 1925 | 1925-04-23 | 1925-09-19 |
| 1926 | 1926-04-30 | 1926-09-18 |
| 1927 | 1927-05-21 | 1927-09-17 |
| 1928 | 1928-05-02 | 1928-10-11 |
| 1929 | 1929-04-06 | 1929-09-04 |
| 1930 | 1930-04-10 | 1930-10-10 |
| 1931 | 1931-05-27 | 1931-09-21 |
| 1932 | 1932-05-14 | 1932-09-19 |
| 1933 | 1933-05-23 | 1933-09-25 |
| 1934 | 1934-05-03 | 1934-09-25 |
| 1935 | 1935-06-13 | 1935-09-24 |
| 1936 | 1936-05-06 | 1936-09-22 |
| 1937 | 1937-05-29 | 1937-10-01 |
| 1938 | 1938-05-02 | 1938-10-17 |
| 1939 | 1939-04-24 | 1939-09-16 |
| 1940 | 1940-05-13 | 1940-10-05 |
| 1941 | 1941-05-04 | 1941-09-24 |
| 1942 | 1942-04-29 | 1942-09-18 |
| 1943 | 1943-05-05 | 1943-08-31 |
| 1944 | 1944-05-15 | 1944-09-18 |
| 1945 | 1945-06-23 | 1945-09-09 |
| 1948 | 1948-06-01 | 1948-09-20 |
| 1949 | 1949-05-03 | 1949-10-08 |
| 1950 | 1950-05-24 | 1950-10-18 |
| 1951 | 1951-05-16 | 1951-09-12 |
| 1952 | 1952-04-28 | 1952-09-30 |
| 1953 | 1953-05-09 | 1953-10-18 |
| 1954 | 1954-06-09 | 1954-10-03 |
| 1955 | 1955-05-03 | 1955-09-19 |
| 1956 | 1956-05-22 | 1956-10-02 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 50 | 84 | 1921 | 37 |
| 35 C (95 F): Days | 44 | 30 | 1934 | 3 |
| 40 C (104 F): Days | 6 | 8 | 1936 | 1 |
| 90 F (32.2 C): Days | 50 | 62 | 1921 | 24 |
| 100 F (37.8 C): Days | 25 | 15 | 1936 | 1 |
| 110 F (43.3 C): Days | 1 | 2 | 1936 | 2 |
| 0 C (32 F): Ice days (max | 50 | 75 | 1912 | 26 |
| 0 C (32 F): Frost days (min | 50 | 170 | 1926 | 150 |
| -10 C (14 F): Days with min | 50 | 67 | 1912 | 34 |
| -20 C (-4 F): Days with min | 47 | 27 | 1936 | 3 |
| -30 C (-22 F): Days with min | 9 | 1 | 1897 | 1 |
| 20 C (68 F): Tropical nights (min | 50 | 37 | 1896 | 16 |
| 25 C (77 F): Days with min | 13 | 3 | 1896 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 51 | 44 | 1941 | 21 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 50 | 16 | 1935 | 6 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 29 | 6 | 1936 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 5 | 1 | 1926 | 1 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1952 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 42 | 7 | 1951 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 1911 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.
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).