Modern London has a uniform climate of South East England, with mild winters and mild summers. The average air temperature during the day is 52°F (11°C), with 42°F (5.5°C) in January and 18°C (65°F) in July. Summers are short, comfortable and partly cloudy, while winters are long, very cold, windy and mostly cloudy. The temperature usually ranges from 39 °F to 74 °F, rarely dropping below 30 °F or above 84 °F.
The weather station site is the highest of all those in the London area and, as a result, daytime temperatures are usually one degree lower than those in Heathrow, Kew, Northolt and Greenwich.
Cloudy Days in LondonThe cloudiest month of the year in London is December, during which, on average, the sky is overcast or cloudy 72% of the time. The perceived humidity level in London does not vary significantly throughout the year, and remains practically constant at 0% throughout the year. Spring in London is quite unpredictable, with weather that can range from warm days (with temperatures up to 70 degrees) to cold and humid days.
Rainy Days in LondonThe month with the least wet days in London is April, with an average of 6.5 days with at least 0.04 inches of precipitation. The month with the most wet days in London is November, with an average of 9.2 days with at least 0.04 inches of precipitation.
Windy Days in LondonThe windiest month of the year in London is January, with an average hourly wind speed of 13.1 miles per hour. The calmest month of the year in London is July, with an average hourly wind speed of 9.8 miles per hour.
The topography within 2 miles of London contains only modest variations in elevation, with a maximum elevation change of 164 feet and an average elevation above sea level of 70 feet. The estimated value in London is calculated as a weighted average of the individual contributions of each station, these weighted averages being proportional to the inverse of the distance between London and a given station.