Mean solar radiation (at top) is highest during the 6-months from April through September and lowest from October through March. It reaches a maximum in June and a minimum in December which corresponds to the summer and winter solstices.

Mean Florida temperature (at bottom) is highest in July/August and lowest in January/February; showing temperature maximums and minimums lagging behind the mean solar radiation by about two months. Analyzing these two graphs, we see that mean temperature over the Florida region is largely determined by the amount of solar radiation received (i.e. Incoming Solar Radiation which is known as insolation).