The wettest December was in 1978 when 142.9mm of rain fell, followed by 1989 (112.4mm) and 1965 (111.4mm). December's average rainfall is 56.5mm.

The driest December was in 1963 when only 10.1mm of rain fell, followed by 1988 (19.8mm) and 2004 (22mm).

1974 had the highest average temperature for December (10.5°C), followed by 1988 (10°C) and 1994 (9.5°C).

The coldest December was in 1981, with an average maximum temperature of 2.8°C, followed by 1976 (4.1°C) and 1995 (4.4°C).

The overall average maximum temperature for December is 7.3°C.

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