Stornoway Arpt climate by month
Averages and records for each calendar month at Stornoway Arpt, United Kingdom, from 1873 to 2026. The warmest month is July, averaging 15.9°C; the coolest is January at 6.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 6.9°C | 1.8°C | 14.4°C10 January 1998 | −12.2°C21 January 1960 | 151 / 153 |
| February | 7.0°C | 1.7°C | 13.9°C25 February 1900 | −11.1°C19 February 1892 | 153 / 153 |
| March | 8.0°C | 2.3°C | 20.0°C9 March 1949 | −10.6°C21 March 1881 | 153 / 153 |
| April | 9.9°C | 3.6°C | 20.8°C17 April 2003 | −8.9°C1 April 1917 | 152 / 153 |
| May | 12.3°C | 5.9°C | 23.9°C29 May 1908 | −4.4°C8 May 1938 | 153 / 153 |
| June | 14.5°C | 8.4°C | 25.6°C2 June 1911 | −0.6°C2 June 1888 | 153 / 153 |
| July | 15.9°C | 10.1°C | 26.2°C15 July 2003 | 0.0°C7 July 1888 | 154 / 154 |
| August | 15.9°C | 10.1°C | 26.3°C3 August 1999 | −3.9°C30 August 1891 | 154 / 154 |
| September | 14.3°C | 8.5°C | 25.0°C1 September 1906 | −0.4°C21 September 1964 | 153 / 153 |
| October | 11.6°C | 6.0°C | 21.1°C5 October 1898 | −4.4°C27 October 1948 | 153 / 153 |
| November | 9.0°C | 3.6°C | 16.3°C6 November 2003 | −14.4°C27 November 1895 | 152 / 153 |
| December | 7.5°C | 2.2°C | 14.4°C2 December 1948 | −16.7°C19 December 1953 | 153 / 153 |
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 151 to 154 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.