According to the  National Oceanic and Atmospheric Administration (NOAA), last month had the highest national average temperature for June in 122 years of temperature record keeping. You can see the June map, as well as other months, along with NOAA’s maps of maximum temps, minimum temps, and regional temps.

See more alarming warming trends at: http://www.ncdc.noaa.gov/temp-and-precip/us-maps/1/201606#us-maps-select