Idaho Falls Rgnl climate by month
Averages and records for each calendar month at Idaho Falls Rgnl, United States, from 1948 to 2026. The warmest month is July, averaging 30.5°C; the coolest is January at −2.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.4°C | −11.8°C | 13.9°C31 January 2003 | −36.1°C12 January 1963 | 74 / 74 |
| February | 0.9°C | −9.3°C | 16.7°C6 February 2015 | −38.9°C1 February 1985 | 75 / 75 |
| March | 7.2°C | −4.4°C | 25.6°C20 March 2026 | −26.7°C2 March 1960 | 74 / 74 |
| April | 13.9°C | −0.4°C | 30.0°C23 April 2012 | −10.6°C23 April 1968 | 74 / 74 |
| May | 19.6°C | 3.8°C | 34.4°C28 May 2003 | −8.3°C5 May 1982 | 74 / 74 |
| June | 24.8°C | 7.5°C | 38.9°C25 June 1988 | −1.7°C2 June 1951 | 73 / 74 |
| July | 30.5°C | 10.4°C | 39.4°C12 July 2026 | 0.6°C6 July 1986 | 73 / 73 |
| August | 29.4°C | 9.4°C | 38.3°C1 August 2026 | −2.2°C26 August 1992 | 74 / 74 |
| September | 23.6°C | 4.9°C | 37.8°C3 September 2022 | −7.8°C20 September 1983 | 73 / 74 |
| October | 15.7°C | −0.4°C | 31.1°C2 October 2010 | −19.3°C30 October 2019 | 73 / 73 |
| November | 6.1°C | −5.3°C | 21.7°C1 November 2014 | −28.3°C29 November 1975 | 73 / 73 |
| December | −0.8°C | −10.3°C | 14.4°C11 December 2014 | −35.0°C5 December 1972 | 73 / 74 |
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 73 to 75 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.