Winter has a big effect on allergies.
Cold winter weather is a blessing for many kids with seasonal allergies, who can count on a break until at least February. A warmer winter can cause plants to pollinate early, meaning sufferers' symptoms start up sooner than usual. A rainy spring can also promote rapid plant growth and lead to an increase in mold, with effects that last well into the fall. Rain can wash away pollen, but the relief is only temporary, since pollen counts can rise rapidly following wet weather.
Other weather clues that may help you to head off your child's worst symptoms. Warm, windy days generally lead to a high pollen count, whereas calm days can leave all that pollen on the ground rather than flying into your child's nose.
Parents May 2016