McMurdo/Williams Fld climate by month

Averages and records for each calendar month at McMurdo/Williams Fld, Antarctica, from 1956 to 2026. The warmest month is January, averaging −0.1°C; the coolest is August at −22.6°C.

Average and record high and low temperature for each calendar month at McMurdo/Williams Fld, with the number of years behind each figure.
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.

Hottest on record13.4°C11 December 1987Source: NOAA GHCN-Daily

Coldest on record−50.6°C8 July 1960Source: NOAA GHCN-Daily

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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.

McMurdo/Williams Fld climate by month

Averages and records for each calendar month at McMurdo/Williams Fld, Antarctica, from 1956 to 2026. The warmest month is January, averaging −0.1°C; the coolest is August at −22.6°C.

Average and record high and low temperature for each calendar month at McMurdo/Williams Fld, with the number of years behind each figure.
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

Hottest on record13.4°C11 December 1987Source: NOAA GHCN-Daily

Coldest on record−50.6°C8 July 1960Source: NOAA GHCN-Daily