Much of Iowa received plenty of sunshine on Thursday, but a risk northwest wind and chilly temperatures made things feel very winter like. The combination of chilly temperatures and clear skies is the subject of today's featured chart. It presents the frequency of having reported clear skies by air temperature during November for Des Moines over all hours of the day. The presence of clear skies is not all that important to experience warm temperatures this time of year as frequencies only appear to marginally increase at the warmest temperatures. The reason is that solar heating isn't all that effective this time of year with limited daylight hours and ever decreasing incidence angle. The impact at below freezing temperatures (very likely overnight hours) is more evident with clear skies more common than not for temperatures well below freezing.

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