Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >
90 Degree Statistics for Rockford and Chicago
Records for Chicago go back to 1871, and Rockford to 1905.
Normals are for the period 1981-2010
Last updated: 5/31/2022
Rockford
| Normal First Date 90 deg: | June 8 | Normal Last Date 90 deg: | August 26 |
| Earliest First: | April 10, 1930 93° |
Earliest Last: | April 29, 1915 90° |
| Latest First: | Sept 1, 2008 90° |
Latest Last: | Oct 9, 2010 90° |
Normal Number of Days with High Temperature of 90 Degrees or Higher
| May | June | July | Aug | Sept | Oct | Annual |
| 0.7 | 3.9 | 5.4 | 3.2 | 1.5 | 0.1 | 14.8 |
| Greatest Number of Days with Maximum Temperature 90 Degrees or Higher in Any Year | |
| 1. 62 (1921) | 6. 44 (1931) |
| 2. 52 (1934) | 7. 42 (1916) |
| 3. 49 (1936, 2012) | 8. 40 (1941,1947,1955) |
| 4. 46 (1937, 1988) | 9. 39 (1939, 1983) |
| 5. 45 (1933) | 10. 37 (1930) |
| Greatest Number of Days with Max Temperature 90 Degrees or Higher By Month | ||||||
| Apr | May | June | Jul | Aug | Sept | Oct |
| 2 (1986) | 10 (1934) | 20 (1933) | 27 (1921) | 24 (1947) | 11 (1939) | 4 (1922) |
| Greatest Consecutive Number of Days in Each Year with Max Temperature 90 Degrees or Higher | |||||
| 1895...6 | 1896...9 | 1897...8 | 1898...5 | 1899...M | 1900...M |
| 1901...M | 1902...M | 1903...3 | 1904...M | 1905...5 | 1906...3 |
| 1907...1 | 1908...3 | 1909...2 | 1910...5 | 1911...6 | 1912...2 |
| 1913...8 | 1914...6 | 1915...1 | 1916...21 | 1917...4 | 1918...4 |
| 1919...6 | 1920...3 | 1921...21 | 1922...8 | 1923...7 | 1924...2 |
| 1925...8 | 1926...4 | 1927...5 | 1928...3 | 1929...10 | 1930...5 |
| 1931...9 | 1932...11 | 1933...8 | 1934...8 | 1935...11 | 1936...13 |
| 1937...10 | 1938...4 | 1939...7 | 1940...8 | 1941...13 | 1942...5 |
| 1943...7 | 1944...7 | 1945...4 | 1946...M | 1947...13 | 1948...10 |
| 1949...7 | 1950...3 | 1951...2 | 1952...3 | 1953...11 | 1954...3 |
| 1955...10 | 1956...6 | 1957...3 | 1958...2 | 1959...8 | 1960...5 |
| 1961...5 | 1962...3 | 1963...4 | 1964...3 | 1965...2 | 1966...4 |
| 1967...3 | 1968...5 | 1969...2 | 1970...4 | 1971...3 | 1972...3 |
| 1973...4 | 1974...3 | 1975...5 | 1976...3 | 1977...4 | 1978...5 |
| 1979...1 | 1980...2 | 1981...2 | 1982...1 | 1983...10 | 1984...2 |
| 1985...2 | 1986...4 | 1987...10 | 1988...9 | 1989...9 | 1990...3 |
| 1991...7 | 1992...2 | 1993...2 | 1994...5 | 1995...8 | 1996...4 |
| 1997...2 | 1998...4 | 1999...5 | 2000...3 | 2001...6 | 2002...5 |
| 2003...3 | 2004...1 | 2005...7 | 2006...3 | 2007...4 | 2008...2 |
| 2009...4 | 2010...2 | 2011...5 | 2012...10 | 2013...5 | 2014...1 |
| 2015...4 | 2016...2 | 2017...6 | 2018...3 | 2019...3 | 2020...7 |
| 2021...6 | |||||
Chicago
| Normal First Date 90 deg: | June 5 | Normal Last Date 90 deg: | August 31 |
| Earliest First: | April 10, 1930 90° |
Earliest Last: | July 1, 1967 90° |
| Latest First: | Sept 14, 1915 90° |
Latest Last: | Oct 6, 1963 94° |
Normal Number of Days with High Temperature of 90 Degrees or Higher
| May | June | July | Aug | Sept | Annual |
| 0.8 | 4.1 | 6.5 | 3.7 | 1.6 | 16.7 |
| Greatest Number of Days with Maximum Temperature 90 Degrees or Higher in Any Year | |
| 1. 47 (1988) | 6. 36 (1954) |
| 2. 46 (1955, 2012) | 7. 35 (1964, 1971) |
| 3. 42 (1953, 1983) | 8. 34 (1944) |
| 4. 39 (1959) | 9. 33 (1977, 1987) |
| 5. 38 (1952) | 10. 32 (1934) |
| Greatest Number of Days with Max Temperature 90 Degrees or Higher By Month | ||||||
| Apr | May | June | Jul | Aug | Sept | Oct |
| 2 (1930) | 10 (1977) | 16 (1954) | 19 (1955,1987) | 18 (1947) | 9 (1931) | 2 (1971) |
| Greatest Consecutive Number of Days in Each Year with Max Temperature 90 Degrees or Higher | |||||
| 1871...0 | 1872...4 | 1873...2 | 1874...3 | 1875...0 | 1876...4 |
| 1877...1 | 1878...2 | 1879...3 | 1880...4 | 1881...3 | 1882...2 |
| 1883...3 | 1884...1 | 1885...2 | 1886...1 | 1887...3 | 1888...2 |
| 1889...2 | 1890...3 | 1891...3 | 1892...5 | 1893...3 | 1894...3 |
| 1895...4 | 1896...4 | 1897...3 | 1898...5 | 1899...1 | 1900...8 |
| 1901...2 | 1902...1 | 1903...5 | 1904...3 | 1905...3 | 1906...3 |
| 1907...1 | 1908...3 | 1909...2 | 1910...3 | 1911...6 | 1912...2 |
| 1913...3 | 1914...3 | 1915...1 | 1916...5 | 1917...4 | 1918...4 |
| 1919...3 | 1920...5 | 1921...5 | 1922...4 | 1923...8 | 1924...1 |
| 1925...3 | 1926...3 | 1927...4 | 1928...2 | 1929...2 | 1930...5 |
| 1931...6 | 1932...5 | 1933...3 | 1934...8 | 1935...2 | 1936...5 |
| 1937...2 | 1938...2 | 1939...4 | 1940...7 | 1941...3 | 1942...3 |
| 1943...4 | 1944...7 | 1945...3 | 1946...3 | 1947...8 | 1948...8 |
| 1949...6 | 1950...2 | 1951...2 | 1952...5 | 1953...11 | 1954...11 |
| 1955...11 | 1956...5 | 1957...3 | 1958...2 | 1959...11 | 1960...5 |
| 1961...3 | 1962...6 | 1963...3 | 1964...7 | 1965...2 | 1966...4 |
| 1967...2 | 1968...5 | 1969...5 | 1970...7 | 1971...4 | 1972...4 |
| 1973...10 | 1974...3 | 1975...4 | 1976...3 | 1977...9 | 1978...6 |
| 1979...1 | 1980...9 | 1981...2 | 1982...2 | 1983...9 | 1984...4 |
| 1985...4 | 1986...5 | 1987...10 | 1988...9 | 1989...2 | 1990...2 |
| 1991...5 | 1992...2 | 1993...3 | 1994...6 | 1995...5 | 1996...3 |
| 1997...5 | 1998...3 | 1999...5 | 2000...3 | 2001...5 | 2002...5 |
| 2003...2 | 2004...1 | 2005...8 | 2006...6 | 2007...4 | 2008...3 |
| 2009...3 | 2010...5 | 2011...5 | 2012...8 | 2013...4 | 2014...1 |
| 2015...2 | 2016...4 | 2017...7 | 2018...3 | 2019...3 | 2020...6 |
| 2021...5 | |||||
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