Why are meteorologists always talking about allergy season in the spring?
Well, weather plays a huge role in how allergy season develops, how long it lasts, what the pollen counts are, etc. Pollen and other allergen counts change on a daily basis and there is some science to forecasting allergies.
Wind works to transport pollen and other particles from one place to another. Just how strong the wind is can affect how bad allergy symptoms might become.
Rain has many affects on how allergens affect us. Rain can pull allergens down, but it also works to help plants and vegetation grow.
Moisture is not just rain. It also has do deal with how dry or moist the ground is. Based on the amount of moisture around, allergy effects may vary.
Temperatures can be high or low, but as spring continues on, things tend to heat up. Warmth is an important factor in plant growth, as it affects allergen counts.
Check out this slide-show for more details on how weather affects allergies.