The average temperature for the contiguous US during May was 64.3°F (17.9 °C), 3.3 °F above the long-term average, making it the second warmest May on record, according to the May/Spring Monthly Climate Report from the National Oceanic and Atmospheric Administration (NOAA). The month’s high temperatures also contributed to the warmest spring, warmest year-to-date, and warmest 12-month period the nation has experienced since record keeping began in 1895.
The spring season’s (March-May) nationally-averaged temperature was 57.1°F (13.9 °C), 5.2 °F above the 1901-2000 long-term average, surpassing the previous warmest spring (1910) by 2.0 °F.
Precipitation totals across the country were mixed during May, with the nation as a whole being drier than average. The nationally-averaged precipitation total of 2.51 inches was 0.36 inch below average. The coastal Southeast received some drought relief when Tropical Storm Beryl brought heavy rains to the region late in the month.
Warmer-than-average temperatures occurred across all parts of the contiguous U.S., except the Northwest, during May. Twenty-six states had May temperatures ranking among their ten warmest.