Flagstaff weather by month
Measured at Flagstaff/Pulliam Arpt
Averages and records for each calendar month at Flagstaff/Pulliam Arpt, United States, from 1893 to 2026. The warmest month is July, averaging 27.6°C; the coolest is January at 5.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.8°C | −9.1°C | 18.9°C30 January 1971 | −34.4°C22 January 1937 | 98 / 100 |
| February | 7.3°C | −7.6°C | 21.7°C26 February 1986 | −30.6°C1 February 1985 | 99 / 101 |
| March | 10.3°C | −5.1°C | 28.9°C19 March 2026 | −26.7°C4 March 1966 | 101 / 101 |
| April | 14.9°C | −2.2°C | 28.3°C27 April 1898 | −18.9°C2 April 1975 | 101 / 103 |
| May | 20.0°C | 1.3°C | 33.9°C27 May 1896 | −10.0°C9 May 1930 | 100 / 100 |
| June | 25.7°C | 5.7°C | 35.6°C27 June 1898 | −5.6°C2 June 1951 | 101 / 102 |
| July | 27.6°C | 10.7°C | 37.2°C28 July 1898 | 0.0°C5 July 1955 | 103 / 103 |
| August | 26.2°C | 10.0°C | 35.0°C12 August 1940 | −4.4°C23 August 1968 | 102 / 102 |
| September | 23.2°C | 5.7°C | 32.8°C6 September 2020 | −5.6°C26 September 1934 | 99 / 100 |
| October | 17.5°C | −0.2°C | 29.4°C1 October 1980 | −18.9°C30 October 1971 | 99 / 99 |
| November | 11.0°C | −5.2°C | 23.3°C10 November 1897 | −25.0°C18 November 1958 | 100 / 101 |
| December | 6.5°C | −8.4°C | 20.0°C11 December 1950 | −30.6°C8 December 1978 | 102 / 102 |
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 98 to 103 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.