Mid-Atlantic Climate Impacts Summary and Outlook: Summer 2024

MARISA Mid-Atlantic Regional Climate Summary map and title

Average temperatures were higher than normal across the Mid-Atlantic region during the summer season, with some sites experiencing the hottest summer on record. Explore future projected days with extreme temperatures in the latest MARISA Seasonal Climate Impacts Summary and Outlook.

Highlights

Average temperatures for the 2024 summer season were either 0–2 or 2–4 degrees F above normal across the Mid-Atlantic region. This is a few degrees warmer than the Summer 2023 season, which was the first season since at least 2018 where temperatures were largely below normal.
Several sites experienced summers that ranked in their top five hottest on record, including Dulles Airport, Virginia, which saw its hottest summer season on record.
Precipitation amounts varied both across the region and over the course of the summer season. Some locations saw as little as 50–75 percent of normal rainfall while others experienced over 150 percent of normal precipitation.
The Mid-Atlantic region could see nearly a 190 percent increase (from 16.5 days to 47.7 days) in the average number of days with temperatures greater than 90 degrees F by mid-century and over a 300 percent increase (from 16.5 days to 68.1 days) by the end of the century under a high future climate scenario (SSP3-7.0).

Read the Climate Summary

The MARISA Seasonal Climate Impacts Summary and Outlook is a seasonal series produced by MARISA, the NOAA-funded Mid-Atlantic Climate Adaptation Partnerships team, and details seasonal weather and climate variability and change in the Mid-Atlantic region.

MARISA is led by the non-profit RAND, in partnership with researchers in Penn State University’s Earth and Environmental Systems Institute, Johns Hopkins University, the Department of Earth and Atmospheric Sciences at Cornell University, the Virginia Institute of Marine Science, Morgan State University, and Carnegie Mellon University.