The featured chart presents the average daily diurnal temperature cycle. The values are the departure from the daily mean temperature. The chart nicely depicts the profile of when the warmest and coolest temperatures are each day. The magnitude of the values during the winter season are less due to the decreased power of the sun and dominance of warm and cold air advection not forced by the sun. This time of year and April see the strongest diurnal signal thanks to decreased amounts of water vapor in the air (warms and cools more quickly).

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Tags:   climate   temp