Lewiston/Nez Perce Cnty climate by month
Averages and records for each calendar month at Lewiston/Nez Perce Cnty, United States, from 1948 to 2026. The warmest month is July, averaging 32.2°C; the coolest is January at 4.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.5°C | −2.4°C | 18.9°C9 January 1953 | −30.0°C31 January 1950 | 79 / 79 |
| February | 7.9°C | −0.7°C | 22.2°C24 February 1986 | −26.1°C2 February 1950 | 79 / 79 |
| March | 12.3°C | 1.5°C | 26.7°C26 March 2025 | −16.7°C5 March 1955 | 79 / 79 |
| April | 16.8°C | 4.3°C | 36.1°C24 April 1977 | −6.7°C19 April 1966 | 79 / 79 |
| May | 21.8°C | 8.3°C | 37.8°C29 May 1983 | −5.0°C1 May 1954 | 79 / 79 |
| June | 26.3°C | 12.0°C | 46.1°C29 June 2021 | 1.1°C1 June 1951 | 79 / 79 |
| July | 32.2°C | 15.4°C | 43.9°C21 July 2024 | 5.0°C2 July 1955 | 79 / 79 |
| August | 31.5°C | 15.0°C | 46.1°C4 August 1961 | 5.0°C24 August 1992 | 79 / 79 |
| September | 25.8°C | 10.6°C | 39.4°C2 September 1950 | −2.2°C17 September 1965 | 78 / 79 |
| October | 17.3°C | 5.2°C | 31.7°C2 October 1975 | −9.4°C31 October 2002 | 78 / 78 |
| November | 9.0°C | 1.0°C | 25.0°C12 November 1999 | −19.4°C14 November 1955 | 78 / 78 |
| December | 4.9°C | −1.7°C | 18.9°C11 December 2014 | −30.0°C30 December 1968 | 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.