The dew point temperature does not receive much thought among the general public during the cold season as things like heat index and fuel for thunderstorms are of nill concern. The data certainly has forecasting value during this time of year as it helps define the wet bulb temperature, which is very important to knowing the precipitation type. As during the warm season, the dew point temperature has a strong signal by which direction the wind is blowing from as shown by the featured chart for Des Moines during January. On average, our driest air flows from the dry continental air masses of the Canadian Plains (NW) and most humid from the Gulf of Mexico (SSW).

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