Rockford Intl climate by month
Averages and records for each calendar month at Rockford Intl, United States, from 1951 to 2026. The warmest month is July, averaging 28.9°C; the coolest is January at −2.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.1°C | −11.0°C | 17.2°C31 January 1989 | −34.9°C31 January 2019 | 76 / 76 |
| February | 0.6°C | −8.8°C | 25.6°C27 February 2024 | −31.1°C3 February 1996 | 76 / 76 |
| March | 7.4°C | −2.9°C | 29.4°C29 March 1986 | −23.9°C1 March 1962 | 76 / 76 |
| April | 15.2°C | 3.2°C | 32.8°C22 April 1980 | −15.0°C7 April 1982 | 76 / 76 |
| May | 21.8°C | 9.0°C | 37.2°C27 May 2012 | −4.4°C10 May 1966 | 76 / 76 |
| June | 27.1°C | 14.7°C | 38.3°C20 June 1988 | 2.8°C1 June 1993 | 76 / 76 |
| July | 28.9°C | 17.2°C | 40.6°C7 July 2012 | 6.1°C5 July 1967 | 76 / 76 |
| August | 27.8°C | 16.1°C | 40.0°C16 August 1988 | 5.0°C25 August 1958 | 76 / 76 |
| September | 24.0°C | 11.4°C | 38.9°C1 September 1953 | −2.8°C30 September 1984 | 75 / 76 |
| October | 17.1°C | 5.0°C | 32.2°C6 October 1963 | −9.4°C29 October 1952 | 75 / 75 |
| November | 8.3°C | −1.4°C | 25.0°C1 November 2016 | −23.3°C26 November 1977 | 75 / 75 |
| December | 0.8°C | −7.6°C | 20.6°C3 December 2012 | −31.1°C24 December 1983 | 75 / 75 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 75 to 76 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.