Summer is getting warmer in Washington State

Summer (June-July-August) temperatures in Washington have risen at a rate of 0.21 F per decade since 1930, and 0.37 F per decade since 1950.  Seven of the ten warmest summers on record since Washington began keeping track in 1895 occurred after 1985.[[National Climatic Data Center, “Washington Climate Summary,” The trend values given in this entry are up-to-date as of September 2009.]] The warming is consistent with broader patterns of average temperature increase in the American West that have been attributed, at least in part, to human-induced climate change.