National Climate Report - August 2016
Summer Dew Point Temperature Maps

« National Climate Report - August 2016

Summer Dew Point Temperature Maps

Dew point temperature is the measurement of moisture in the air and is associated with relative humidity. Higher dew points indicate more moisture-laden air, which can raise the apparent temperature that is represented in measures like "heat index". The maps below depict the average, and the departure from average, dew point temperatures for June through August 2016. On the departure map, the blue dots signify stations that experienced lower than average dew point temperatures ("drier than normal" air) during the summer period. The red dots represent higher than average dew point temperatures ("more moist then normal" conditions). Summer dew points were below normal in the west, expecially in the Great Basin region, while much of the eastern half of the country had above average dew points.

Typically, moist air (high dew points) limits nighttime cooling, resulting in warmer overnight low temperatures (minimum temperatures). So, it is not coincidental that the highest dew point departures are strongly correlated with both the minimum temperature departures and the precipitation percent of average.

Dew Point Averages Dew Point Departures
Average Dew Points (jun-aug)  Average Dew Point Departures (jun-aug)

Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: National Climate Report for August 2016, published online September 2016, retrieved on July 24, 2019 from