Harrisburg Intl climate by month
Averages and records for each calendar month at Harrisburg Intl, United States, from 1941 to 2026. The warmest month is July, averaging 30.2°C; the coolest is January at 3.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.5°C | −4.8°C | 23.9°C26 January 1950 | −30.0°C21 January 1994 | 59 / 61 |
| February | 5.0°C | −4.0°C | 26.1°C21 February 2018 | −21.1°C2 February 1961 | 60 / 61 |
| March | 10.5°C | 0.1°C | 30.6°C30 March 1998 | −18.2°C7 March 2015 | 60 / 61 |
| April | 17.4°C | 5.8°C | 33.9°C25 April 1960 | −4.4°C14 April 1950 | 58 / 60 |
| May | 22.9°C | 11.5°C | 35.6°C19 May 1962 | −1.0°C10 May 2020 | 59 / 60 |
| June | 27.8°C | 16.7°C | 38.3°C26 June 1952 | 5.0°C1 June 1945 | 59 / 60 |
| July | 30.2°C | 19.5°C | 39.4°C22 July 2011 | 7.8°C7 July 1942 | 59 / 60 |
| August | 28.9°C | 18.2°C | 38.9°C5 August 1955 | 6.7°C27 August 1944 | 59 / 60 |
| September | 25.0°C | 14.2°C | 38.9°C1 September 1943 | 0.0°C28 September 1947 | 58 / 60 |
| October | 18.8°C | 7.8°C | 33.9°C2 October 2019 | −3.3°C26 October 1952 | 59 / 60 |
| November | 11.8°C | 2.0°C | 27.8°C1 November 1950 | −9.4°C29 November 1955 | 59 / 60 |
| December | 5.4°C | −2.7°C | 23.9°C7 December 1998 | −22.8°C23 December 1960 | 59 / 60 |
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 58 to 60 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.