This past July will probably be the coldest on record once all of the data is collected. The featured plot displays the average dew point for Des Moines for the past Julys since 1973. The lack of humidity helps to allow temperatures to cool off during the night time. August has started off muggy and warm, which is a welcome change of pace for now.

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Tags:   jul09   july  

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