BALTIMORE-WASHINGTON INTERNATIONAL weather by month
Averages and records for each calendar month at BALTIMORE-WASHINGTON INTERNATIONAL, United States, from 1939 to 2026. The warmest month is July, averaging 31.0°C; the coolest is January at 5.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.5°C | −3.7°C | 25.6°C26 January 2024 | −21.7°C29 January 1963 | 87 / 87 |
| February | 7.2°C | −2.7°C | 26.1°C24 February 1985 | −19.4°C10 February 1979 | 87 / 87 |
| March | 12.3°C | 1.3°C | 31.7°C29 March 1945 | −15.5°C4 March 2014 | 87 / 87 |
| April | 18.5°C | 6.5°C | 34.4°C23 April 1960 | −6.7°C4 April 1965 | 87 / 87 |
| May | 23.7°C | 11.9°C | 37.8°C28 May 1941 | 0.0°C11 May 1966 | 87 / 87 |
| June | 28.6°C | 17.1°C | 39.4°C29 June 2012 | 4.4°C11 June 1972 | 87 / 87 |
| July | 31.0°C | 19.9°C | 41.1°C22 July 2011 | 10.0°C1 July 1988 | 88 / 88 |
| August | 29.8°C | 19.0°C | 40.6°C20 August 1983 | 7.2°C30 August 1986 | 88 / 88 |
| September | 26.1°C | 15.0°C | 37.8°C8 September 1939 | 1.7°C25 September 1963 | 87 / 88 |
| October | 19.9°C | 8.4°C | 37.2°C5 October 1941 | −3.9°C31 October 1966 | 87 / 87 |
| November | 13.6°C | 2.9°C | 30.0°C1 November 1950 | −10.6°C29 November 1955 | 87 / 87 |
| December | 7.7°C | −1.6°C | 25.0°C29 December 1984 | −17.8°C23 December 1960 | 87 / 87 |
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 87 to 88 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.