London was known for its cold and rainy weather, but in recent years we are seeing some climate change.
Till now it has enjoyed an oceanic climate, similar to the climate of much of southern Britain; the weather is strongly influenced by the Gulf Stream, which moderates the temperatures in all seasons.
Winter temperatures rarely drop below -4 ° C or exceed 14 ° C. The snow usually occurs about 4 or 5 times a year between December and February. In summer it is difficult to exceed 30 ° C, the highest temperature ever recorded in London was 39.7 ° C in Heathrow airport during the hot summer of 2003. [ read more here]