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WHICH MONTH OF THE YEAR IS TYPICALLY WARMEST?

METEOROLOGIST JEFF HABY

For the Northern Hemisphere, the month of August is typically the hottest month for many locations. The reason is due to cumulative warming and a relatively high sun angle. It is interesting to note that the highest sun angle occurs at the start of summer and by the end of summer it is the lowest it has been all summer. The warmest temperatures do not occur when the sun angle is the highest due to cumulative warming. The sun angle is relatively high all summer, thus the land and water can continue to warm up through the summer. It takes months to recover for the cold land and cold water temperatures produced from the winter season. By the start of summer the process of warming the land and water temperatures is continuing. By September, the sun angle is starting to get low enough that cumulative heating stops and thus the temperatures begin to cool. Thus, the hottest month of the year for most Northern Hemisphere locations is August.