In December the average maximum daytime temperature is a cool 11°C (51°F), while the average minimum night-time temperature is a cold 3°C (38°F). Temperatures may fall below freezing in December.

On average 77 mm (3 inches) of rainfall is expected during December with rain generally falling on 10 days of the month. There are usually 4 hours of bright sunshine each day, which represents 39% of daylight hours.

During December around midday under clear sky conditions the UV Index Low (UV Index 1). Average sea temperature in December is a very cold 14°C (59°F).