WARMEST SUMMER ON RECORD for the contiguous U.S. Before you get all weird in the comments…this is a three-month average temperature of the summer months and includes both daytime highs and lows. Overnight lows are warming remarkably fast. No question asphalt and developing land has something to do with urban heat islands and warming temps. El Niño is a big factor too and could influence global heat records for the next year. But our greenhouse gas emissions still add a layer of amplification. Me