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John Wheeler, WDAY, Published December 08 2012

Weather Talk: During winter, temps can rise at night, fall in day

There are many obvious differences between weather in winter and summer. Less obvious to most people, but fascinating to those who watch weather closely, are the wintertime occurrences of nontraditional diurnal temperatures.

In other words, when it gets warmer at night or it gets colder during the day. This almost never happens in summer, but it is relatively common in winter. Last Tuesday night, it was 14 degrees at 11 p.m. By morning, it was in the 20s. It kept getting warmer all day and into the evening, reaching 40 degrees at 10 p.m.

This happens in winter because sunshine is relatively weak this time of year and so daily temperature ranges caused by the sun are small. Meanwhile, strong winter fronts often produce extreme changes in temperature, which can easily cause the temperature to rise at night or to fall during the day.

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