Mount Vernon Arpt climate by month
Averages and records for each calendar month at Mount Vernon Arpt, United States, from 1895 to 2026. The warmest month is July, averaging 31.8°C; the coolest is January at 4.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.6°C | −5.5°C | 23.9°C24 January 1943 | −29.4°C19 January 1994 | 129 / 130 |
| February | 6.7°C | −4.2°C | 26.1°C29 February 1972 | −30.0°C10 February 1899 | 129 / 131 |
| March | 12.8°C | 1.0°C | 33.3°C21 March 1907 | −23.3°C4 March 1978 | 129 / 130 |
| April | 19.3°C | 6.7°C | 32.8°C30 April 1901 | −8.3°C1 April 1923 | 129 / 131 |
| May | 24.6°C | 12.0°C | 37.2°C28 May 1911 | −1.7°C1 May 1903 | 129 / 131 |
| June | 29.7°C | 16.9°C | 40.6°C25 June 1914 | 2.2°C1 June 1924 | 129 / 132 |
| July | 31.8°C | 19.1°C | 45.6°C14 July 1936 | 7.8°C23 July 1947 | 128 / 131 |
| August | 31.1°C | 18.0°C | 43.9°C17 August 1936 | 5.6°C29 August 1986 | 130 / 131 |
| September | 27.6°C | 13.8°C | 40.6°C15 September 1939 | −5.0°C30 September 1899 | 130 / 132 |
| October | 21.2°C | 7.3°C | 35.6°C5 October 1938 | −7.8°C24 October 1981 | 130 / 130 |
| November | 13.1°C | 1.4°C | 30.0°C1 November 1938 | −20.6°C30 November 1929 | 129 / 131 |
| December | 6.4°C | −3.5°C | 25.6°C2 December 1970 | −28.3°C22 December 1989 | 126 / 130 |
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 126 to 130 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.