Keflavikurflugvollur climate by month
Averages and records for each calendar month at Keflavikurflugvollur, Iceland, from 1949 to 2026. The warmest month is July, averaging 13.3°C; the coolest is January at 2.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.4°C | −2.1°C | 10.3°C31 January 1999 | −15.6°C24 January 1956 | 53 / 78 |
| February | 2.8°C | −1.8°C | 10.6°C12 February 2004 | −17.2°C7 February 1969 | 50 / 78 |
| March | 3.5°C | −1.3°C | 12.3°C10 March 2004 | −20.0°C18 March 1989 | 59 / 78 |
| April | 6.1°C | 1.0°C | 20.0°C5 April 2001 | −14.4°C1 April 1968 | 60 / 78 |
| May | 9.1°C | 3.9°C | 20.0°C18 May 2025 | −6.1°C4 May 1982 | 64 / 77 |
| June | 11.7°C | 6.7°C | 20.0°C11 June 2002 | 0.0°C7 June 1997 | 65 / 77 |
| July | 13.3°C | 8.5°C | 23.9°C31 July 1980 | 3.3°C25 July 1963 | 65 / 78 |
| August | 12.9°C | 8.3°C | 22.9°C12 August 2004 | 0.0°C13 August 1988 | 66 / 78 |
| September | 10.4°C | 5.9°C | 17.8°C10 September 1968 | −5.0°C28 September 1988 | 63 / 77 |
| October | 7.1°C | 3.0°C | 14.5°C2 October 2010 | −7.8°C31 October 1968 | 62 / 77 |
| November | 4.3°C | 0.1°C | 13.5°C14 November 2011 | −12.0°C18 November 2006 | 51 / 77 |
| December | 2.9°C | −1.6°C | 22.0°C10 December 2008 | −14.0°C10 December 2007 | 54 / 77 |
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 50 to 66 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.