Norfolk/Stefan Mem climate by month
Averages and records for each calendar month at Norfolk/Stefan Mem, United States, from 1945 to 2026. The warmest month is July, averaging 30.5°C; the coolest is January at −0.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.5°C | −12.1°C | 23.3°C26 January 2002 | −32.8°C12 January 1974 | 81 / 81 |
| February | 2.1°C | −9.6°C | 24.4°C23 February 2002 | −34.9°C16 February 2021 | 81 / 81 |
| March | 8.6°C | −3.7°C | 35.6°C21 March 2026 | −28.9°C4 March 1960 | 81 / 81 |
| April | 16.4°C | 2.9°C | 35.0°C21 April 1980 | −16.7°C3 April 1975 | 81 / 81 |
| May | 22.4°C | 9.3°C | 39.4°C25 May 1967 | −4.4°C3 May 1976 | 81 / 81 |
| June | 28.1°C | 15.1°C | 41.1°C16 June 1946 | 2.8°C2 June 2022 | 81 / 81 |
| July | 30.5°C | 17.8°C | 45.0°C11 July 1954 | 5.6°C30 July 1971 | 81 / 81 |
| August | 29.3°C | 16.6°C | 41.7°C9 August 1947 | 4.4°C20 August 1950 | 81 / 81 |
| September | 24.9°C | 10.9°C | 38.9°C4 September 2012 | −3.3°C29 September 1984 | 80 / 81 |
| October | 18.1°C | 3.9°C | 36.7°C11 October 2015 | −11.7°C31 October 1993 | 81 / 81 |
| November | 8.8°C | −3.6°C | 28.3°C2 November 2005 | −26.1°C30 November 1964 | 81 / 81 |
| December | 1.6°C | −9.5°C | 21.7°C16 December 1962 | −34.4°C22 December 1989 | 81 / 81 |
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 80 to 81 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.