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Recent and historical weather data customized to meet your needs

Mid-May - Record Warm, Record Wet

mid-may tdpt map

May 1-15 average temperatures were up to 8°F warmer than normal.

The first half of May was warmer than normal across the Northeast, with the greatest departures of 6°F to 8°F above normal in the region’s southeastern corner. May 1-15 average temperatures at the region’s 35 major sites ranged from 0.4°F above normal in Portland, ME, to 5.6°F above normal in Philadelphia, PA. This first half of May ranked among the 20 warmest such periods for 22 of the sites, with Islip, NY, being record warm.

mid-may temp chart

This May 1-15 period was record warm for Islip, NY, and among the 20 warmest such periods for another 21 of the major sites.

mid-may pdpt map

May 1-15 precipitation ranged from 50% of normal to more than 200% of normal.

Much of the Northeast was wetter than normal during the first half of May, with a large swath of the region from eastern West Virginia to southern Maine seeing over 200% of normal precipitation. However, some spots along the edges of the region including parts of northern Maine, the Delmarva Peninsula, and southern West Virginia were drier, seeing as little as 50% of normal precipitation. At the region’s 35 major sites, May 1-15 precipitation ranged from 56% of normal in Huntington, WV, to 400% of normal in Allentown, PA, which was record wet. Additionally, Worcester, MA, recorded its wettest first half of May. Overall, 31 of the sites were wetter than normal, with 22 of them experiencing one of their 20 wettest May 1-15 periods.

Meanwhile, none of the major climate sites saw measurable snow during the first half of May. Only five major sites average snowfall for the May 1-15 period with amounts being 0.6 inches or less.

mid-may precip chart

This May 1-15 period was record wet for Allentown, PA, and Worcester, MA, and among the 20 wettest for another 20 major sites.

For June, NOAA’s Climate Prediction Center expects wetter-than-normal conditions to continue for the Northeast. There’s also a slightly increased likelihood of warmer-than-normal temperatures for the Mid-Atlantic and an areas from southeastern New York to coastal Maine. Equal chances of below-, near-, or above-normal temperatures forecast for the rest of the region.

may outlook maps

June is expected to be wetter and warmer than normal for a large portion of the Northeast. Click to enlarge.