The following climate factors can influence how bad allergy symptoms might be:
•    Tree, grass and ragweed pollens thrive on cool nights and warm days.
•    Molds like heat and humidity.
•    Pollen levels tend to peak in the morning hours.
•    Rain washes pollen away, but their counts can soar after a rain.
•    On a day with no wind, airborne allergens are grounded.
•    When the day is windy and warm, pollen counts surge.
•    Moving to another climate to avoid allergies is usually not successful – allergens are virtually everywhere.