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There are four seasons in the year in the UK, but what causes them and how do they affect us?
Tree pollen occurs first, typically from late March to mid-May. Grass (which actually has two peaks) lasts from mid-May until July, and weed pollen covers the end of June to September.
When does summer start and other summer facts you should know.
Take care when travelling in heavy rain, wind and thunderstorms.
Please note that when changing units, only forecasts and maps will be affected.