Climate Chart of London, Great Britain

Climate overview

Temperature

The coolest monthly mean is 4.7 °C in January, while the warmest is 18.6 °C in July. These are averages across each month, not daytime highs, so they describe the broad temperature profile rather than the conditions visitors will encounter every day. Across the calendar, the unweighted mean of monthly mean temperatures is 11.2 °C. It provides a useful overall reference, but does not imply that temperatures remain near that figure throughout the year.

Rain

Mean daily rainfall reaches its highest monthly average at 2.51 mm/day in October and its lowest at 1.33 mm/day in April. These are daily averages for the named months, not monthly totals; the lower average can help identify an option for visitors prioritising less rainfall, but it does not guarantee dry days or show how often rain falls. The unweighted mean of the monthly mean daily rainfall values is 1.89 mm/day. As an overall reference, it does not describe the timing or intensity of individual showers.

Sunshine

Mean daily sunshine is highest at 10.94 hours/day in July and lowest at 3.14 hours/day in December. This contrast can inform plans for outdoor sightseeing, but sunshine duration measures neither day length nor guaranteed clear weather. The unweighted mean of monthly mean daily sunshine is 7.24 hours/day, a broad reference for the year rather than a promise of similar sunshine from day to day.

Snow

Mean daily snowfall is highest at 0.94 mm/day in January, and the unweighted mean of the monthly values is 0.25 mm/day. These averages record snowfall amounts only; they do not establish how many days have snow, snow depth or snow cover, and cannot indicate skiing conditions.