Higher dewpoints are explained by global warming
- Five year average dew points at Fairbanks, Alaska and at airport stations
in the Midwest were the highest of record from 1998 through 2002*. The
greatest increase in dewpoints occurred during the non growing season
months. Stations located in counties with declining population and
minimal development (Dubuque, Iowa and International Falls, Minnesota)
had dew point increases as great or greater than other areas, thus
dewpoint measurements were likely not affected by urban heat influences.
The most likely explanation for the increases in dewpoints is global
warming, caused by anthropogenic greenhouse gas emissions and global
* Period of record generally 1949-current, monthly and annual dewpoint
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