As global warming accelerates, average temperatures will climb. Above-average and record temperatures will become more common.
“From the deserts of Arizona to the swamps of the Chesapeake, 2017 has already been a memorably scorching year—and it’s only half over. The first six months of 2017 were the second warmest on record for the contiguous U.S. (behind only 2012) in observations going back to 1895, according to NOAA’s national climate summary for June. The nation is well synched with the planet as a whole, which has been running second only to 2016 for its warmest year on record.
“Four states sweated through their all-time warmest January-to-June period: North and South Carolina, Georgia, and Florida. Every one of the contiguous U.S. states has experienced a top-twelve-warmest year thus far, except for an eight-state arc running from California to the Dakotas.” –Bob Henson Weather Underground.