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Coastal fog refers to the occurrence of fog over coastal regions, usually occurring in Spring and Summer. It is also known as Haar and Fret in some parts of the UK.
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.
Heading to the beach this summer? The RNLI gives advice on how you and your family can stay safe.
Please note that when changing units, only forecasts and maps will be affected.