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The ultra long range weather forecast is based on data from the the Climate Forecast System v2 (CFSv2) model. It is updated daily.
Weather, max and min temperatures, wind speed and direction, pressure.
Number of days: snow, frost, wind stronger than 30mph, temperature max, min and above 21°C.
Forecasting the weather more than a few days ahead in Great Britain is very difficult. Consistently accurate long rang forecasts accurately is next to impossible with current technology.
Use this page to try and identify long range trends. For example, are the summer months showing long settled spells or the winter months cold ones. Is the forecast consistent from day to day or is it changing dramatically? If it is the former then confidence could be higher.
Above all don't rely on this page but have fun using it!
The seasonal discussion forecasts on TheWeatherOutlook consider many other factors than the CFS2 model and so could be very different.
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Summer 2020 update 2
UK forecasts
14 day outlook
Monthly outlook
Seasonal outlook
7 day timeline
7 day forecast
16 day forecast
16 day risk