Stykkisholmur climate by month
Averages and records for each calendar month at Stykkisholmur, Iceland, from 1949 to 2026. The warmest month is July, averaging 13.3°C; the coolest is January at 1.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.7°C | −3.0°C | 10.9°C3 January 2019 | −16.0°C30 January 1971 | 78 / 78 |
| February | 2.0°C | −2.7°C | 11.7°C1 February 2025 | −17.7°C7 February 1969 | 78 / 78 |
| March | 2.5°C | −2.3°C | 12.2°C17 March 2006 | −19.0°C9 March 1969 | 78 / 78 |
| April | 5.1°C | −0.1°C | 16.4°C28 April 2007 | −16.0°C1 April 1968 | 78 / 78 |
| May | 8.5°C | 3.0°C | 20.5°C17 May 2025 | −6.7°C5 May 1982 | 78 / 78 |
| June | 11.6°C | 6.2°C | 22.0°C20 June 1949 | −0.8°C1 June 1975 | 78 / 78 |
| July | 13.3°C | 8.1°C | 21.0°C31 July 1980 | 2.0°C25 July 1963 | 78 / 78 |
| August | 12.9°C | 7.9°C | 20.8°C1 August 1980 | 0.5°C26 August 2005 | 78 / 78 |
| September | 10.1°C | 5.5°C | 18.5°C4 September 2010 | −4.9°C19 September 2000 | 77 / 77 |
| October | 6.4°C | 2.3°C | 15.7°C2 October 2002 | −8.0°C30 October 1968 | 77 / 77 |
| November | 3.8°C | −0.5°C | 13.3°C17 November 2018 | −11.8°C18 November 2006 | 77 / 77 |
| December | 2.1°C | −2.5°C | 13.4°C14 December 2001 | −14.8°C18 December 1973 | 77 / 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 77 to 78 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.