London features a humid temperate oceanic climate (Cfb). This gives the city cool winters, warm to hot summers with precipitation fairly evenly distributed all year round. London has a very rich history of meteorological observations, with precipitation records beginning as early as January 1697 at Kew Gardens. Irregular observations were made at multiple locations in the ensuing years. An observing station has been located at Greenwich since 1841, giving London its longest continuous reliable temperature series. Other stations include Heathrow, beginning in 1948, Hampstead, beginning in 1910, Northolt, beginning in 1948, and St James's Park, beginning in 1910. The highest temperature ever observed in London is provisionally recorded at both Heathrow Airport and St James's Park on 19 July 2022 and the lowest is 1 January 1962. The lowest daily maximum temperature is occurring on 3 occasions: 8 January 1841, 4 January 1867 and 12 January 1987. The highest daily minimum temperature recorded is , recorded in Kenley on 19 July 2022. This is also the highest minimum temperature ever reported anywhere in the United Kingdom. In addition to this, London holds multiple national records, including the record maximum for the months of February, April, May and June. The city can sometimes experience extremes. Snowfall is an infrequent occurrence in winter, falling on an average of 16 days per year, though infrequently heavy. Thunderstorms are a similarly occurring feature, occurring on average up to 16 days per year. London rarely experiences tornadoes, although an F2 struck Kensal Green on 7 December 2006. London is vulnerable to climate change in the United Kingdom, and there is increasing concern among hydrological experts that London households may run out of water before 2050. In January 2023, London Mayor Sadiq Khan issued a "very high" air-pollution alert and urged citizens to avoid unnecessary car journeys as the city grappled with high levels of pollution, according to AQI website, which stated that london's air quality index stood at 58, considered moderate. Classifications Climate data tables London Weather Centre Heathrow - Airport Weather Station in the suburbs of West London Kew Gardens - Weather Station in South West London on the banks of the River Thames Hampstead - Weather Station in North London The weather station enclosure is the most elevated of any in the London area, and as a result daytime temperatures are typically one degree lower than Heathrow, Kew, Northolt and Greenwich. Northolt -