Temperature and dewpoint data
- Temperature and dewpoint data
Link posted in a comment at RC's Polar Amplification, for Western Region Climate Center (includes AK), and Desert Research Institute:
103 Years of Twin Cities Dew Point Temperature Records: 1902-2005
Plots of monthly, annual and daily high low temperature data at some U.S. climate stations from 1888 to current within the Midwest, Great Plains, Northwest and Alaska.
NOAA NCDC has temperature data for the U.S. but there's a user fee for non-gov employee users.