Monticello/Ellis Fld climate by month
Averages and records for each calendar month at Monticello/Ellis Fld, United States, from 1876 to 2026. The warmest month is July, averaging 33.6°C; the coolest is January at 11.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 11.9°C | 0.2°C | 28.3°C25 January 1972 | −20.0°C12 January 1962 | 90 / 92 |
| February | 14.5°C | 2.2°C | 30.0°C8 February 2025 | −21.1°C2 February 1951 | 89 / 90 |
| March | 19.1°C | 6.4°C | 32.2°C20 March 2004 | −11.7°C3 March 1980 | 88 / 90 |
| April | 23.8°C | 10.9°C | 35.6°C18 April 2006 | −5.6°C6 April 1971 | 91 / 93 |
| May | 27.9°C | 15.6°C | 37.2°C30 May 1886 | 2.2°C12 May 1960 | 93 / 96 |
| June | 31.8°C | 19.8°C | 40.0°C28 June 2012 | 6.1°C1 June 1887 | 95 / 96 |
| July | 33.6°C | 21.5°C | 42.8°C19 July 2006 | 10.0°C15 July 1884 | 92 / 96 |
| August | 33.4°C | 20.8°C | 42.2°C8 August 1943 | 7.8°C25 August 1887 | 94 / 96 |
| September | 30.5°C | 17.4°C | 42.2°C1 September 2000 | 0.6°C24 September 1887 | 92 / 94 |
| October | 25.1°C | 11.0°C | 36.1°C15 October 2015 | −6.7°C30 October 1887 | 93 / 96 |
| November | 18.3°C | 5.7°C | 31.7°C7 November 2005 | −11.7°C30 November 1979 | 88 / 90 |
| December | 13.4°C | 1.8°C | 27.8°C3 December 1982 | −18.3°C30 December 1876 | 89 / 91 |
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 88 to 95 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.