Oslo/Gardermoen Arpt climate by month
Averages and records for each calendar month at Oslo/Gardermoen Arpt, Norway, from 1951 to 2026. The warmest month is July, averaging 21.1°C; the coolest is January at −2.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.8°C | −9.0°C | 11.1°C14 January 2022 | −31.3°C1 January 1979 | 69 / 73 |
| February | −1.8°C | −9.2°C | 12.4°C23 February 1998 | −35.5°C9 February 1966 | 69 / 73 |
| March | 3.2°C | −5.3°C | 19.5°C27 March 2012 | −27.2°C3 March 1987 | 73 / 73 |
| April | 8.7°C | −0.8°C | 24.5°C30 April 2026 | −14.8°C10 April 1977 | 73 / 73 |
| May | 15.3°C | 4.4°C | 28.6°C25 May 2012 | −6.0°C5 May 1974 | 73 / 73 |
| June | 19.6°C | 9.0°C | 32.3°C19 June 1970 | −2.5°C1 June 1975 | 73 / 73 |
| July | 21.1°C | 11.0°C | 31.9°C16 July 2026 | 1.9°C7 July 1964 | 73 / 73 |
| August | 19.8°C | 9.9°C | 32.6°C7 August 1975 | −1.2°C26 August 1973 | 73 / 73 |
| September | 14.8°C | 6.2°C | 25.7°C3 September 1991 | −6.0°C26 September 1968 | 71 / 71 |
| October | 8.4°C | 1.9°C | 20.3°C9 October 1969 | −16.1°C31 October 1980 | 71 / 71 |
| November | 2.3°C | −3.0°C | 16.9°C15 November 2020 | −23.6°C23 November 1965 | 67 / 71 |
| December | −1.5°C | −7.6°C | 11.6°C14 December 1991 | −28.2°C29 December 1976 | 67 / 72 |
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 67 to 73 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.