
© GLEN STUBBE / STAR TRIBUNE VIA APA Saint Paul Hotel doorman clears snow during a mid-April snowfall in Minneapolis. It was a cold, snowy month across the nation.
The evidence of a spring-deferred lay in a yellow layer on Thursday atop a Center City building.
Donald J. Dvorin, the region's official pollen counter, noticed it on the roof, above his office, where he collects samples to calculate the daily count. "We saw the pollen looking yellow," said Dvorin, a physician with the Asthma Center, a sure sign that "it's accumulating."
Since last week, the tree-pollen counts have been "extreme," the fallout from a particularly chilly April - around here and across the nation - that delayed the pollen season a good 10 days, he said.
Temperatures in the contiguous United States were 2.2 degrees below 20th century averages last month, making it the coldest April in 20 years, according to a government analysis released Tuesday.
Overall, it was the ninth-chilliest April in Pennsylvania in records dating to 1895,
said the National Center for Environmental Information.