Dillon Arpt climate by month
Averages and records for each calendar month at Dillon Arpt, United States, from 1940 to 2026. The warmest month is July, averaging 28.6°C; the coolest is January at 0.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 0.2°C | −11.4°C | 14.4°C22 January 1981 | −40.5°C13 January 2024 | 81 / 81 |
| February | 2.7°C | −9.6°C | 17.8°C28 February 1986 | −36.7°C4 February 1989 | 82 / 82 |
| March | 6.9°C | −6.3°C | 26.1°C29 March 1986 | −30.5°C4 March 2019 | 82 / 82 |
| April | 12.4°C | −2.1°C | 29.4°C27 April 1987 | −20.6°C8 April 1982 | 81 / 82 |
| May | 17.7°C | 2.5°C | 32.2°C19 May 1954 | −10.0°C2 May 1954 | 81 / 81 |
| June | 22.5°C | 6.4°C | 36.7°C28 June 2015 | −3.9°C3 June 1951 | 80 / 82 |
| July | 28.6°C | 9.6°C | 38.9°C12 July 2002 | 0.0°C8 July 1981 | 82 / 83 |
| August | 27.6°C | 8.6°C | 38.9°C12 August 1940 | −1.1°C31 August 1956 | 82 / 83 |
| September | 21.5°C | 4.3°C | 36.1°C3 September 2022 | −12.2°C20 September 1983 | 81 / 82 |
| October | 14.5°C | −0.6°C | 30.0°C3 October 2010 | −22.7°C26 October 2020 | 81 / 81 |
| November | 5.8°C | −6.5°C | 21.7°C1 November 1965 | −33.9°C16 November 1955 | 80 / 81 |
| December | 0.8°C | −10.5°C | 16.7°C2 December 2021 | −38.3°C24 December 1983 | 81 / 81 |
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 80 to 82 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.