Much needed rainfall fell over Iowa on Tuesday and into Wednesday morning. This rain also fell at somewhat chilly temperatures in the 40s. The featured chart presents a heat map of reported measurable precipitation by air temperature and given week of the year for Ames. A simple / weighted weekly average is plotted as well. For late October, mid 40s is about average for air temperature during precipitation. The 32°F reference line is plotted and you can see a clear increase in frequency at the temperature bin just above. This is due to the relative ease of the precipitation sensor to report 0.01" of falling liquid precipitation vs the same amount as snow melted to liquid. Measuring snowfall is tricky enough with light snowfall rates being even more challenging to measure as the liquid is lost to sublimation and evaporation prior to being measured.

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