This summer, the United States is expected to experience unusually high temperatures, potentially ranking amongst the hottest on record. The transition from El Niño to La Niña is a contributing factor to this prediction. Warmer-than-average conditions are expected to cover much of the country, particularly in the Southwest and Plains regions extending into the Midwest, Great Lakes, and Northeast. Conversely, parts of Southern California and Arizona may experience cooler-than-average temperatures, while the West Coast is expected to remain near average or slightly warmer. https://weather.com/forecast/national/news/2024-04-16-summer-temperature-outlook