Increase in average temperatures by season in Maine, 1896–2023 

Winter (Dec, Jan, Feb)
+5.6
Spring (Mar, Apr, May)
+2.7
Summer (Jun, Jul, Aug)
+2.9
Fall (Sep, Oct, Nov)
+3.1
Per the Environmental Protection Agency: Temperature increases are in degrees Fahrenheit, calculated from the long-term average rate of change.
Chart: Annie RopeikSource: EPA/NOAACreated with Datawrapper