Phoenix/Deer Valley Arpt climate by month
Averages and records for each calendar month at Phoenix/Deer Valley Arpt, United States, from 1998 to 2026. The warmest month is July, averaging 40.3°C; the coolest is December at 18.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 18.8°C | 6.4°C | 27.8°C31 January 2003 | −5.5°C14 January 2007 | 28 / 28 |
| February | 20.5°C | 7.6°C | 32.2°C27 February 2026 | −4.3°C3 February 2011 | 28 / 28 |
| March | 24.3°C | 10.5°C | 39.4°C19 March 2026 | 0.0°C3 March 2002 | 28 / 28 |
| April | 28.5°C | 13.7°C | 38.3°C22 April 2012 | 2.8°C2 April 1999 | 28 / 28 |
| May | 33.4°C | 18.2°C | 43.3°C29 May 2000 | 8.3°C1 May 1999 | 28 / 28 |
| June | 39.1°C | 23.6°C | 47.2°C19 June 2016 | 13.9°C5 June 1999 | 27 / 28 |
| July | 40.3°C | 27.7°C | 46.7°C21 July 2006 | 18.9°C1 July 2004 | 27 / 28 |
| August | 39.3°C | 27.1°C | 46.1°C14 August 2020 | 20.6°C31 August 2000 | 27 / 28 |
| September | 36.7°C | 23.9°C | 44.4°C4 September 2020 | 13.3°C24 September 2017 | 28 / 29 |
| October | 30.4°C | 17.1°C | 42.2°C1 October 2024 | 4.4°C29 October 2009 | 28 / 28 |
| November | 23.8°C | 10.8°C | 35.0°C5 November 2020 | −1.0°C29 November 2010 | 28 / 28 |
| December | 18.3°C | 6.3°C | 27.8°C1 December 2021 | −2.2°C29 December 2003 | 28 / 28 |
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 27 to 28 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.