Petersburg Arpt climate by month
Averages and records for each calendar month at Petersburg Arpt, United States, from 1926 to 2026. The warmest month is July, averaging 17.5°C; the coolest is January at 1.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.4°C | −4.1°C | 18.3°C14 January 2018 | −28.3°C30 January 1947 | 85 / 86 |
| February | 2.9°C | −3.3°C | 18.9°C27 February 1992 | −26.1°C2 February 1968 | 84 / 87 |
| March | 5.2°C | −1.9°C | 18.9°C20 March 2019 | −21.1°C3 March 1955 | 87 / 87 |
| April | 9.2°C | 0.7°C | 22.8°C30 April 2004 | −12.2°C2 April 1948 | 85 / 87 |
| May | 13.4°C | 4.3°C | 26.1°C26 May 1995 | −6.1°C2 May 1956 | 84 / 86 |
| June | 16.3°C | 7.6°C | 28.3°C8 June 1958 | −1.7°C7 June 1933 | 80 / 83 |
| July | 17.5°C | 9.4°C | 28.9°C17 July 1927 | 2.8°C1 July 1938 | 82 / 87 |
| August | 17.3°C | 8.9°C | 28.3°C1 August 2013 | 0.0°C27 August 1948 | 84 / 87 |
| September | 14.1°C | 6.6°C | 27.2°C14 September 1938 | −5.6°C26 September 1972 | 78 / 84 |
| October | 9.4°C | 3.4°C | 22.2°C19 October 1938 | −11.1°C27 October 1971 | 81 / 86 |
| November | 4.7°C | −0.7°C | 17.8°C1 November 1970 | −22.2°C26 November 1985 | 81 / 87 |
| December | 1.9°C | −3.2°C | 15.0°C12 December 1944 | −23.3°C15 December 1964 | 83 / 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 78 to 87 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.