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Usually when we talk about the first day of summer we are referring to the astronomical summer which is defined by the Earth's axis and orbit around the sun.
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.
Hail is solid precipitation in the form of balls or pieces of ice known as hailstones.
How you can protect your pets from the effects of hay fever.
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