The Weather in London
The weather on London can be unpredictable even in the Summer months so always be prepared for rain.
The snowy months are usually around February but frost can occur anytime between November and March.
Generally the weather goes downhill from November onwards with a good chance of windy grey days.
Easter usually marks the start of better weather.
The weather is normally a couple of degrees warmer than outlying areas due to urban heating and consequently central London is one of the warmest places in the UK.
Surprisingly, the annual rainfall in London is less than that of Sydney, Australia but its spread across many more days of the year resulting in the famous UK "Grey day" with little sunshine.
Quick Look statistics about London Weather
Hottest Month: July @ 18C
Coldest Month: January @ 4C
Wettest Month: October @ 71mm
Driest Month: September @ 40mm
Sunniest Month: June and July
Average Annual temperature: 10.4C
Average Annual precipitation: 595mm
Recommended London Weather resources
By far the best weather source for London is the Met Office.
Using the link provided, you can access all the real time weather info and projections for the next 5 days.
Using the same data source, the BBC London weather site gives a simplified version
London weather by month
January in London produces on average 19 rainy days and a temperature range of usually between 3C and 12C. Most days will be "grey" with an average 83% cloud cover during the daytime. Early January is more prone to rain than towards the end but all in all not a good month for walking the streets of London.
Historically, the middle of February is when snow can hit the London streets, on average 3 times. Temperatures range between 2C and 7C. Like January, many days will be grey and cloudy with rain falling on at least 50 percent of the days. Snow fall can affect London airports. It might be a good idea to select a London hotel with real fires in the public lounges for that cozy evening relaxing.
March weather in London on has an average temperature of 8C, although in extremes it has been known to reach the 20's. Its the start of Spring so daylight hours increases to an average of 5 per day.
35mm of rain fall for the month falls on one day in every two, so a good chance of your visit being a wet one.
A month of change as the days get warmer and Spring arrives. Temperatures range from 5C up to 13C with occasional exceptional days of plus 20C towards the month end. Historically, the first week of April is the best week for good weather.
The average rainfall is 50mm falling ,lightly, over around 20 days of the month. It has been known to snow in April.
Plants are flowering and some days will be almost Summery. The temperature range increases to between 8C and 17C with 12 hours of daylight. In saying that, there will be a 70% cloud cover statistic for the whole month. It will rain on more than 50% of the days of May.
June will have a much improved temperature range of 11C to 20C with an average of 16C. It rains on average for 13 out of 30 days but the total monthly precipitation is only 43mm.
Its the first week of the Wimbledon tennis and you may recall that it is regularly hit by "rain halted play" messages.
On average, July has 14 hours of daylight per day with a 63% cloud cover. Its now Summer and the temperature range is a pleasant 13C to 23C. In July 2013, the temperature on the 22nd climbed to a record breaking 33C.
You will still almost certainly experience a shower or two but they should be light and short lived.
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