Polar Opposite Precipitation
May 1-15 precipitation ranged from less than 25% of normal to more than 200% fo normal.
Precipitation during the first half of May ranged from less than 25% of normal to more than 200% of normal, with the dividing line between below normal and above normal generally hugging the New York border with Pennsylvania and New Jersey. New York and New England missed out on much of the precipitation, with some areas, particularly large chunks of Maine, seeing less than 25% of normal precipitation. Southern parts of the Northeast were wetter, with areas such as central Pennsylvania seeing more than 200% of normal precipitation. May 1-15 precipitation at the 35 major climate sites ranged from 15% of normal in Hartford, CT, to 230% of normal in Harrisburg, PA, with 21 of the sites seeing above-normal precipitation. This May 1-15 period ranked among the 10 driest for two major climate sites but among the 20 wettest for 12 of the sites. The abundant precipitation in southern parts of the region helped alleviate areas of abnormal dryness.
The precipitation during the first half of May fell primarily as rain, with no major climate sites recording snowfall during the period (only five of the sites average snowfall for May 1-15 period with amounts being 0.6 inches or less).
This May 1-15 period ranked among the 10 driest for two major climate sites but among the 20 wettest for 12 of the sites.
May 1-15 average temperatures ranged from 4°F below normal to 6°F above normal.
Average temperatures during the first half of May ranged from 4°F below normal to 6°F above normal, with the southeastern corner of the region generally being cooler than normal and much of the rest of the region seeing near- or above-normal temperatures. May 1-15 average temperatures at the 35 major climate sites ranged from 2.5°F below normal in Washington, D.C., to 4.6°F above normal in Buffalo, NY. Of the 21 major climate sites that were warmer than normal, six of them experienced one of their 20 warmest May 1-15 periods on record.
This May 1-15 period ranked among the 20 warmest on record for six major climate sites.