Petersburg/Grant Cnty weather by month
Averages and records for each calendar month at Petersburg/Grant Cnty, United States, from 1994 to 2026. The warmest month is July, averaging 30.5°C; the coolest is January at 5.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.9°C | −5.5°C | 23.9°C13 January 2017 | −23.3°C22 January 2025 | 25 / 29 |
| February | 7.2°C | −5.1°C | 25.6°C25 February 2017 | −23.9°C5 February 1996 | 18 / 28 |
| March | 13.0°C | −1.2°C | 32.2°C23 March 2026 | −20.6°C6 March 2015 | 23 / 28 |
| April | 19.3°C | 4.0°C | 39.4°C28 April 2009 | −7.2°C10 April 1997 | 23 / 28 |
| May | 23.7°C | 9.3°C | 36.7°C22 May 2009 | −2.2°C14 May 1996 | 20 / 28 |
| June | 28.2°C | 14.2°C | 37.8°C30 June 2012 | 3.3°C2 June 2025 | 25 / 31 |
| July | 30.5°C | 16.8°C | 40.0°C23 July 2011 | 7.8°C5 July 1996 | 18 / 27 |
| August | 29.5°C | 15.8°C | 37.8°C1 August 1999 | 5.6°C30 August 2025 | 21 / 29 |
| September | 25.9°C | 11.3°C | 38.3°C8 September 2015 | 0.6°C22 September 2020 | 17 / 29 |
| October | 19.5°C | 4.8°C | 31.7°C8 October 2007 | −7.8°C23 October 1997 | 20 / 28 |
| November | 13.2°C | −0.4°C | 32.2°C6 November 2015 | −12.8°C29 November 2023 | 24 / 28 |
| December | 7.9°C | −3.5°C | 26.7°C6 December 2001 | −19.4°C7 December 2002 | 23 / 27 |
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 17 to 25 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.