LA CROSSE, Wis. -

Sneezing, sniffling and watery eyes. Sure signs that allergy season has finally arrived.

The long winter and last week's rainfall slowed down the spread of tree pollen. In fact, it's about a month and half late.

But that's not the case anymore. An allergy expert says allergy sufferers who spend extended time outside will notice the pollen.

And it's also impacted by the weather. "Typically pollen will come out on temperate days, sunny days, typically later in the morning, early afternoon. Light breeze, all of those things will factor a high pollen count," says Dr. George Kroker of Allergy Associates.

An estimated 20 to 40 percent of people suffer from allergies.