July in May: Year’s First 90-Degree Hit Anticipated Here

STATE COLLEGE PA – Southeastern Pennsylvania and the remainder of the nation’s eastern half is about to get a full taste of summer, two weeks ahead of schedule.

Meteorological summer begins June 1, forecasters at State College-based AccuWeather Inc. said Tuesday (May 18, 2021). Astronomical summer officially arrives June 20, they add. Forget both. The weather data company’s meteorologists expect temperatures to surge well into the 80s over much of the region beginning Wednesday (May 19), continuing into this weekend and beyond.

A few locations may even experience their first 90-degree temperature of the season so far, but it could feel close to 100 as humidity levels climb. Temperatures can surge to 10 degrees or more above the actual temperature during the day, considering the strengthening sun during May’s second half.

The Philadelphia’s region’s average first 90-degree day is due May 24 (Monday), AccuWeather Meteorologist Matt Benz predicted. The last time regional temperatures climbed anywhere near that – into the upper 80s – was April 28.

Average first dates for 90-degree temperature readings are based on data collected over a 30-year period from 1991 to 2020. The National Oceanic and Atmospheric Administration and National Climatic Data Center recently reviewed and updated “normal” temperature and climate variables for the U.S. It’s a process completed every 10 years.

Potential problems ahead? Rising heat increases the danger of dehydration, heat stroke and heat exhaustion. Older adults, infants, and those with medical conditions may be especially at risk. They should minimize outdoor activity and stay in an air-conditioned location if possible, AccuWeather suggested.

Weather map supplied by AccuWeather Inc.