McMurdo weather by month
Averages and records for each calendar month at McMurdo, Antarctica, from 1956 to 2026. The warmest month is January, averaging −0.1°C; the coolest is August at −22.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.1°C | −5.6°C | 10.1°C12 January 2002 | −17.2°C31 January 1989 | 43 / 50 |
| February | −6.4°C | −11.8°C | 6.1°C6 February 1996 | −29.4°C29 February 1992 | 39 / 49 |
| March | −14.3°C | −21.1°C | −1.1°C5 March 1981 | −43.3°C30 March 1965 | 41 / 50 |
| April | −17.3°C | −24.8°C | −3.9°C16 April 1968 | −42.2°C27 April 1989 | 43 / 51 |
| May | −19.3°C | −27.1°C | −2.7°C27 May 2003 | −45.0°C1 May 1995 | 41 / 50 |
| June | −19.5°C | −27.7°C | 3.3°C6 June 1987 | −43.9°C21 June 1982 | 39 / 50 |
| July | −21.6°C | −30.0°C | −4.4°C21 July 1956 | −50.6°C8 July 1960 | 42 / 50 |
| August | −22.6°C | −31.6°C | −2.0°C20 August 1988 | −49.4°C8 August 1956 | 42 / 51 |
| September | −20.5°C | −29.2°C | −4.4°C3 September 1972 | −43.9°C1 September 1968 | 42 / 50 |
| October | −15.0°C | −23.1°C | 4.4°C14 October 1992 | −40.0°C14 October 1976 | 42 / 49 |
| November | −6.1°C | −12.4°C | 10.0°C30 November 1987 | −28.3°C1 November 1959 | 42 / 49 |
| December | −0.8°C | −5.9°C | 13.4°C11 December 1987 | −22.8°C2 December 1989 | 39 / 49 |
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 39 to 43 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.