Dayton/Cox Intl climate by month
Averages and records for each calendar month at Dayton/Cox Intl, United States, from 1948 to 2026. The warmest month is July, averaging 29.3°C; the coolest is January at 1.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.8°C | −6.7°C | 21.7°C25 January 1950 | −31.7°C18 January 1994 | 79 / 79 |
| February | 4.1°C | −5.2°C | 24.4°C24 February 2017 | −26.7°C2 February 1951 | 79 / 79 |
| March | 10.1°C | −0.4°C | 30.0°C21 March 2012 | −21.7°C2 March 1980 | 79 / 79 |
| April | 16.9°C | 5.2°C | 31.7°C30 April 1962 | −9.4°C8 April 1972 | 79 / 79 |
| May | 22.5°C | 11.1°C | 33.9°C18 May 1962 | −3.3°C1 May 1963 | 79 / 79 |
| June | 27.5°C | 16.1°C | 38.9°C25 June 1988 | 4.4°C11 June 1972 | 79 / 79 |
| July | 29.3°C | 18.3°C | 38.9°C14 July 1954 | 6.7°C6 July 1972 | 79 / 79 |
| August | 28.5°C | 17.2°C | 38.9°C17 August 1988 | 4.4°C3 August 1965 | 79 / 79 |
| September | 25.0°C | 13.1°C | 38.3°C6 September 1954 | 0.0°C23 September 1974 | 78 / 79 |
| October | 18.3°C | 6.9°C | 34.4°C1 October 2019 | −6.1°C26 October 1962 | 78 / 78 |
| November | 10.6°C | 1.2°C | 26.7°C8 November 2020 | −18.9°C30 November 1958 | 78 / 78 |
| December | 4.3°C | −3.8°C | 22.2°C2 December 1982 | −28.9°C22 December 1989 | 78 / 78 |
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 78 to 79 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.