Most people understand relative humidity, but the dew point is a much better measure of how humid it really feels.

To convert between the dew point and relative humidity, several approximations have been proposed over the last 200 years, but they all require a calculator or mathematical tables, and most ...

The Service Temperature Correction Table is a valuable, scientifically sound predictive tool developed by CTLGroup, a wholly-owned subsidiary of the Portland Cement Association.

For those interested in the numbers, here are the statewide averages of relative humidity (RH) and dew point for each state. A ranking (1=most, 50=least) is also included.

In contrast, relative humidity can vary tremendously during the day, often by 70 percent or more. It’s usually highest at daybreak and lowest in the mid-afternoon.