Relative Humidity and Dewpoint

Tuesday, October 2, 2017 provided an excellent example of why meteorologists turn to dewpoint temperature to get a better picture of moisture in the air. Relative humidity is a good index to monitor drying potential, disease potential, or fire risk, but relative humidity is relative to the air temperature. When the air temperature changes, the relative humidity changes. Dewpoint temperature is an absolute measure of water vapor, independent of air temperature.

Wheat dew on heads(2)

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