Harrisburg/Capital City Arpt climate by month
Averages and records for each calendar month at Harrisburg/Capital City Arpt, United States, from 1939 to 2026. The warmest month is July, averaging 30.2°C; the coolest is January at 3.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.2°C | −5.0°C | 22.8°C26 January 1950 | −22.8°C22 January 1984 | 79 / 79 |
| February | 4.9°C | −4.0°C | 28.3°C21 February 2018 | −20.6°C18 February 1979 | 78 / 79 |
| March | 10.5°C | 0.2°C | 30.0°C29 March 1945 | −16.6°C6 March 2015 | 79 / 79 |
| April | 17.3°C | 5.6°C | 33.9°C22 April 1985 | −7.2°C7 April 1982 | 79 / 79 |
| May | 22.9°C | 11.2°C | 36.1°C31 May 1939 | −0.6°C11 May 1966 | 79 / 79 |
| June | 27.7°C | 16.2°C | 37.8°C26 June 1952 | 4.4°C11 June 1980 | 79 / 79 |
| July | 30.2°C | 18.9°C | 41.7°C3 July 1966 | 9.4°C12 July 1945 | 79 / 79 |
| August | 29.0°C | 18.1°C | 38.3°C12 August 1944 | 7.2°C31 August 1976 | 79 / 79 |
| September | 25.0°C | 13.8°C | 38.9°C2 September 1953 | −1.1°C24 September 1963 | 77 / 79 |
| October | 18.7°C | 7.6°C | 36.1°C5 October 1941 | −5.0°C24 October 1969 | 78 / 78 |
| November | 11.8°C | 2.2°C | 28.9°C1 November 1950 | −10.6°C29 November 1955 | 77 / 78 |
| December | 5.4°C | −2.7°C | 23.9°C29 December 1984 | −22.2°C23 December 1960 | 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 77 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.