Rochester Intl climate by month
Averages and records for each calendar month at Rochester Intl, United States, from 1893 to 2026. The warmest month is July, averaging 27.9°C; the coolest is January at −5.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −5.5°C | −15.2°C | 14.4°C25 January 1944 | −40.0°C30 January 1951 | 110 / 111 |
| February | −3.0°C | −13.0°C | 20.6°C26 February 2024 | −37.2°C2 February 1996 | 109 / 111 |
| March | 4.0°C | −5.8°C | 27.8°C24 March 1910 | −35.0°C1 March 1962 | 111 / 111 |
| April | 13.0°C | 1.4°C | 33.3°C24 April 2009 | −15.0°C6 April 1982 | 110 / 111 |
| May | 20.2°C | 7.8°C | 41.1°C31 May 1934 | −6.1°C3 May 1910 | 111 / 111 |
| June | 25.6°C | 13.4°C | 40.6°C27 June 1934 | −0.6°C9 June 1937 | 110 / 112 |
| July | 27.9°C | 15.7°C | 42.2°C14 July 1936 | 4.4°C17 July 1911 | 111 / 112 |
| August | 26.5°C | 14.3°C | 37.8°C3 August 1930 | 0.0°C30 August 1915 | 112 / 112 |
| September | 22.1°C | 9.6°C | 37.8°C6 September 1913 | −5.6°C28 September 1893 | 111 / 112 |
| October | 15.1°C | 3.2°C | 33.9°C3 October 1997 | −12.2°C23 October 1936 | 109 / 111 |
| November | 5.3°C | −4.1°C | 25.0°C1 November 1893 | −28.9°C26 November 1977 | 111 / 111 |
| December | −2.5°C | −11.4°C | 17.8°C4 December 2017 | −36.1°C19 December 1983 | 110 / 110 |
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 109 to 112 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.