The featured graph is of average July dew points and rainfall (color scale) for Des Moines since 1973. The preliminary total for 2007 is shown with a box around the data point. It is interesting to see how much lower dew points have been this year as compared with the past 10 years. These past 10 years have helped to push the overall dew point trend to +7 °F per 100 years (R²=0.14). Some of the increase is often speculated to be from increased agricultural activity and plant transpiration.

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Tags:   july