Johnstown/Murtha Arpt climate by month
Averages and records for each calendar month at Johnstown/Murtha Arpt, United States, from 2000 to 2026. The warmest month is July, averaging 25.9°C; the coolest is January at 0.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 0.1°C | −7.1°C | 18.3°C8 January 2008 | −25.5°C7 January 2014 | 26 / 26 |
| February | 2.1°C | −6.2°C | 22.8°C20 February 2018 | −23.8°C16 February 2015 | 26 / 26 |
| March | 7.6°C | −1.8°C | 25.6°C22 March 2026 | −18.8°C6 March 2015 | 26 / 26 |
| April | 14.5°C | 4.0°C | 28.3°C27 April 2009 | −9.9°C10 April 2016 | 26 / 26 |
| May | 19.4°C | 9.4°C | 30.6°C30 May 2006 | −4.9°C9 May 2020 | 26 / 26 |
| June | 23.6°C | 14.0°C | 32.2°C29 June 2012 | 3.3°C2 June 2003 | 26 / 26 |
| July | 25.9°C | 16.5°C | 34.4°C22 July 2011 | 5.6°C2 July 2001 | 26 / 26 |
| August | 24.9°C | 15.7°C | 32.2°C1 August 2002 | 6.7°C30 August 2025 | 25 / 27 |
| September | 21.4°C | 12.1°C | 31.1°C9 September 2002 | 0.0°C29 September 2000 | 26 / 27 |
| October | 15.0°C | 6.3°C | 28.9°C1 October 2019 | −3.2°C28 October 2011 | 26 / 26 |
| November | 8.6°C | 0.6°C | 24.4°C4 November 2003 | −14.4°C25 November 2005 | 26 / 26 |
| December | 2.9°C | −4.0°C | 21.7°C5 December 2001 | −22.1°C23 December 2022 | 26 / 26 |
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 25 to 26 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.