The presence of clouds has an impact on near surface air temperature, but that impact varies by time of day and time of year. The featured chart attempts to tease out the impact by looking at the simple difference between hours that have significant cloud cover versus all hourly temperature reports. A general summation of the chart is that clouds suppress temperatures during the daytime and support temperatures at night time. There is a day of the year impact as well with the largest differences occurring in the fall season.

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Tags:   clouds