Ascension Arpt climate by month
Averages and records for each calendar month at Ascension Arpt, St. Helena, from 1957 to 2001. The warmest month is March, averaging 30.8°C; the coolest is September at 27.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 29.2°C | 22.9°C | 32.2°C26 January 1973 | 17.2°C21 January 1959 | 25 / 29 |
| February | 30.2°C | 23.8°C | 32.8°C26 February 1969 | 20.6°C3 February 1965 | 24 / 30 |
| March | 30.8°C | 24.5°C | 34.2°C5 March 1973 | 21.1°C1 March 1970 | 27 / 30 |
| April | 30.6°C | 24.8°C | 35.0°C17 April 1971 | 20.6°C16 April 1970 | 25 / 30 |
| May | 29.9°C | 24.3°C | 32.3°C22 May 1973 | 20.0°C25 May 1970 | 25 / 30 |
| June | 28.9°C | 23.2°C | 32.2°C27 June 1958 | 18.9°C16 June 1967 | 24 / 29 |
| July | 27.9°C | 22.4°C | 32.7°C21 July 1972 | 18.9°C28 July 1969 | 24 / 28 |
| August | 27.3°C | 21.7°C | 30.0°C3 August 1964 | 18.9°C12 August 1959 | 24 / 29 |
| September | 27.0°C | 21.4°C | 30.6°C22 September 1964 | 18.3°C28 September 1969 | 25 / 30 |
| October | 27.2°C | 21.3°C | 30.6°C13 October 1963 | 18.9°C3 October 1969 | 26 / 30 |
| November | 27.6°C | 21.8°C | 30.6°C2 November 1962 | 18.9°C2 November 1969 | 25 / 29 |
| December | 28.2°C | 22.3°C | 31.7°C24 December 1963 | 19.8°C30 December 1971 | 26 / 30 |
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 24 to 27 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.