Casey climate by month
Averages and records for each calendar month at Casey, Antarctica, from 1969 to 2026. The warmest month is January, averaging 2.5°C; the coolest is August at −10.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.5°C | −2.1°C | 9.2°C25 January 1987 | −10.3°C31 January 2012 | 56 / 57 |
| February | 0.1°C | −4.8°C | 7.5°C10 February 1986 | −18.0°C27 February 2012 | 52 / 57 |
| March | −3.8°C | −9.7°C | 5.6°C16 March 2022 | −26.1°C31 March 1982 | 52 / 58 |
| April | −7.6°C | −15.2°C | 3.0°C27 April 1990 | −31.3°C28 April 1999 | 42 / 58 |
| May | −10.1°C | −18.2°C | 4.5°C5 May 2008 | −34.4°C19 May 1994 | 45 / 58 |
| June | −9.4°C | −18.0°C | 4.4°C10 June 1971 | −34.3°C22 June 2026 | 37 / 58 |
| July | −9.9°C | −19.0°C | 3.5°C3 July 1976 | −41.0°C19 July 1976 | 44 / 58 |
| August | −10.3°C | −19.1°C | 5.0°C6 August 2007 | −38.4°C11 August 1987 | 41 / 58 |
| September | −10.2°C | −18.4°C | 3.9°C21 September 1989 | −34.1°C3 September 1982 | 44 / 58 |
| October | −7.5°C | −14.9°C | 4.0°C24 October 1979 | −31.2°C12 October 1992 | 54 / 57 |
| November | −2.3°C | −8.9°C | 6.0°C21 November 1979 | −23.4°C3 November 1995 | 54 / 57 |
| December | 1.6°C | −3.4°C | 7.7°C18 December 1976 | −13.0°C3 December 1972 | 55 / 57 |
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 37 to 56 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.