Denison weather by month
Measured at Bonham/Jones Fld
Averages and records for each calendar month at Bonham/Jones Fld, United States, from 1903 to 2026. The warmest month is August, averaging 35.1°C; the coolest is January at 12.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 12.1°C | −0.2°C | 27.8°C22 January 1909 | −20.6°C18 January 1930 | 112 / 117 |
| February | 14.5°C | 1.7°C | 33.3°C24 February 1918 | −20.6°C18 February 1910 | 106 / 117 |
| March | 19.5°C | 6.1°C | 35.6°C21 March 1916 | −12.8°C11 March 1948 | 116 / 117 |
| April | 23.9°C | 10.8°C | 36.7°C7 April 1930 | −5.6°C3 April 1936 | 114 / 116 |
| May | 27.7°C | 15.8°C | 40.0°C28 May 1927 | 0.0°C1 May 1903 | 114 / 115 |
| June | 32.2°C | 20.3°C | 42.8°C25 June 2024 | 8.9°C11 June 1988 | 112 / 113 |
| July | 34.8°C | 22.3°C | 44.4°C24 July 1943 | 11.1°C4 July 1924 | 111 / 116 |
| August | 35.1°C | 21.8°C | 46.1°C10 August 1936 | 11.1°C30 August 1904 | 112 / 115 |
| September | 31.5°C | 17.8°C | 42.8°C1 September 1939 | 1.1°C28 September 1909 | 112 / 115 |
| October | 25.6°C | 11.5°C | 39.4°C23 October 1939 | −7.2°C30 October 1917 | 111 / 113 |
| November | 18.6°C | 5.5°C | 31.7°C3 November 2017 | −13.3°C29 November 1976 | 111 / 114 |
| December | 13.5°C | 1.4°C | 30.0°C25 December 1908 | −20.0°C23 December 1989 | 113 / 116 |
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 106 to 116 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.