Cooler Temperatures to Dominate Eastern U.S. as Summer Begins
As the transition from May to June marks the start of meteorological summer, cooler-than-average temperatures are expected to dominate the eastern United States. According to The Washington Post, a surge of cool air from Canada will reach the Northeast and Mid-Atlantic by Friday, followed by an even cooler air mass from Greenland over the weekend. Daytime highs in cities from Boston to Washington, D.C., are forecast to remain in the 60s and 70s °F (15-25°C), with nighttime lows dipping into the 40s and 50s °F (4-15°C). This pattern contrasts with warmer conditions expected in parts of Canada, such as Saskatchewan and Manitoba. Meanwhile, marine heat waves in the Pacific and Atlantic Oceans are anticipated to influence summer weather patterns across the U.S., potentially leading to elevated flood risks in the Gulf Coast and western deserts. 
