Late Season Heat

This latest round of heat caps an already warm summer across the Northwest. Even though this kind of heat this late in the season could challenge records this week, there is evidence that global warming is shifting the seasons - with warmer air arriving earlier and hanging on longer. In a 2011 study, scientists used vegetation to track the start and end of the growing season. They found that even with great yearly variability, the growing season is lasting an average of 6.5 days longer across the northern hemisphere. This is based 26 years of data from 1982-2008.

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