McAllen/Miller Intl climate by month
Averages and records for each calendar month at McAllen/Miller Intl, United States, from 1961 to 2026. The warmest month is August, averaging 36.7°C; the coolest is January at 21.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 21.5°C | 10.1°C | 35.6°C21 January 2017 | −10.6°C12 January 1962 | 65 / 66 |
| February | 23.9°C | 12.0°C | 38.3°C27 February 2009 | −5.5°C15 February 2021 | 66 / 66 |
| March | 27.7°C | 15.7°C | 40.6°C27 March 1984 | −0.6°C2 March 1980 | 66 / 66 |
| April | 30.7°C | 19.3°C | 42.8°C6 April 2022 | 4.4°C8 April 2007 | 66 / 66 |
| May | 32.9°C | 22.3°C | 43.9°C9 May 2024 | 10.6°C3 May 2004 | 66 / 66 |
| June | 35.2°C | 24.1°C | 43.9°C22 June 2017 | 15.0°C3 June 1970 | 66 / 66 |
| July | 36.1°C | 24.6°C | 42.8°C7 July 2009 | 20.0°C2 July 1963 | 66 / 66 |
| August | 36.7°C | 24.8°C | 42.2°C10 August 1988 | 17.8°C13 August 1967 | 66 / 66 |
| September | 34.1°C | 23.2°C | 42.2°C4 September 2011 | 12.2°C30 September 2020 | 64 / 66 |
| October | 30.9°C | 19.2°C | 40.0°C18 October 2012 | 5.0°C31 October 1993 | 64 / 64 |
| November | 26.3°C | 14.9°C | 38.9°C4 November 1988 | 0.0°C28 November 1992 | 65 / 65 |
| December | 22.6°C | 11.4°C | 35.6°C5 December 1977 | −7.8°C23 December 1989 | 65 / 65 |
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 64 to 66 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.