Sion Arpt climate by month
Averages and records for each calendar month at Sion Arpt, Switzerland, from 1955 to 2026. The warmest month is July, averaging 26.7°C; the coolest is January at 4.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.7°C | −3.4°C | 16.8°C19 January 2007 | −20.6°C16 January 1979 | 70 / 71 |
| February | 7.7°C | −1.8°C | 21.4°C23 February 2017 | −17.2°C3 February 1956 | 71 / 71 |
| March | 12.9°C | 1.2°C | 26.6°C29 March 1968 | −12.8°C6 March 1971 | 71 / 71 |
| April | 17.1°C | 4.4°C | 30.2°C21 April 1968 | −7.2°C8 April 1956 | 71 / 71 |
| May | 21.3°C | 8.5°C | 35.1°C25 May 2009 | −2.2°C8 May 1957 | 71 / 71 |
| June | 24.8°C | 11.9°C | 37.0°C30 June 2019 | 1.5°C1 June 2006 | 71 / 71 |
| July | 26.7°C | 13.6°C | 38.0°C24 July 2019 | 2.9°C22 July 1980 | 71 / 72 |
| August | 25.8°C | 13.1°C | 37.6°C24 August 2023 | 3.9°C10 August 1955 | 72 / 72 |
| September | 21.9°C | 9.9°C | 34.0°C17 September 1975 | 0.0°C30 September 1955 | 70 / 71 |
| October | 16.7°C | 5.4°C | 27.4°C12 October 1967 | −5.0°C30 October 1955 | 71 / 71 |
| November | 9.7°C | 0.4°C | 21.1°C7 November 1955 | −13.4°C30 November 1978 | 71 / 71 |
| December | 4.9°C | −2.7°C | 17.5°C3 December 2003 | −17.8°C27 December 1962 | 71 / 71 |
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 70 to 72 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.