Jamestown Rgnl climate by month
Averages and records for each calendar month at Jamestown Rgnl, United States, from 1948 to 2026. The warmest month is July, averaging 28.1°C; the coolest is January at −7.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −7.7°C | −18.2°C | 13.3°C5 January 2012 | −37.8°C29 January 1951 | 78 / 78 |
| February | −4.7°C | −15.4°C | 17.8°C25 February 1958 | −37.2°C9 February 1994 | 78 / 78 |
| March | 2.2°C | −8.5°C | 26.1°C23 March 1963 | −31.1°C2 March 1952 | 78 / 78 |
| April | 11.7°C | −0.9°C | 36.1°C30 April 1992 | −21.1°C3 April 1954 | 78 / 78 |
| May | 19.7°C | 5.9°C | 37.8°C27 May 1969 | −8.9°C2 May 1967 | 78 / 78 |
| June | 24.8°C | 11.8°C | 40.6°C27 June 1961 | 0.0°C20 June 1969 | 78 / 78 |
| July | 28.1°C | 14.5°C | 42.2°C11 July 1973 | 3.3°C3 July 1967 | 79 / 79 |
| August | 27.3°C | 13.0°C | 41.1°C9 August 1958 | 0.0°C27 August 1982 | 79 / 79 |
| September | 21.6°C | 7.4°C | 40.6°C5 September 1978 | −7.8°C26 September 1965 | 78 / 79 |
| October | 13.7°C | 0.9°C | 34.4°C4 October 1963 | −18.3°C31 October 1991 | 78 / 78 |
| November | 3.2°C | −7.2°C | 25.0°C2 November 1978 | −33.2°C27 November 2014 | 78 / 78 |
| December | −4.7°C | −14.6°C | 17.2°C1 December 1969 | −38.3°C23 December 1983 | 78 / 78 |
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 78 to 79 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.