Wilmington/New Castle Arpt weather by month
Averages and records for each calendar month at Wilmington/New Castle Arpt, United States, from 1931 to 2026. The warmest month is July, averaging 30.2°C; the coolest is January at 4.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.7°C | −4.1°C | 23.9°C26 January 1950 | −25.6°C22 January 1984 | 82 / 82 |
| February | 6.1°C | −3.4°C | 25.6°C24 February 1985 | −24.4°C9 February 1934 | 82 / 82 |
| March | 11.1°C | 0.7°C | 30.0°C21 March 1948 | −16.7°C10 March 1984 | 82 / 82 |
| April | 17.5°C | 5.9°C | 34.4°C22 April 1985 | −7.8°C7 April 1982 | 82 / 84 |
| May | 22.8°C | 11.5°C | 35.6°C20 May 1996 | −1.1°C1 May 1978 | 84 / 84 |
| June | 27.7°C | 16.6°C | 38.3°C24 June 2025 | 5.0°C8 June 1932 | 83 / 83 |
| July | 30.2°C | 19.7°C | 39.4°C6 July 2010 | 8.9°C1 July 1988 | 83 / 83 |
| August | 29.1°C | 18.8°C | 38.3°C30 August 1953 | 6.1°C29 August 1982 | 82 / 83 |
| September | 25.5°C | 14.7°C | 37.8°C2 September 1953 | 2.2°C30 September 1942 | 82 / 83 |
| October | 19.4°C | 8.1°C | 36.7°C2 October 2019 | −4.4°C24 October 1969 | 82 / 82 |
| November | 13.0°C | 2.6°C | 29.4°C1 November 1950 | −10.0°C16 November 1933 | 82 / 83 |
| December | 7.1°C | −1.9°C | 23.9°C4 December 1998 | −21.7°C25 December 1983 | 82 / 83 |
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 82 to 84 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.