Seasonal and Daily Temperatures Temperature variations - diurnal and seasonal Seasonal Variations Caused by length of daylight and tilt of the earth. Tilt of earth is 23.5 degrees. Summer and Winter Solstice, Autumnal and Vernal Equinox. This is true for the globe as a whole, but not for individual latitude bands.
Tropics gain more energy then they lose, while polar regions loss more than they gain.
The tilt of the earth also influences the length of day. Notice also that when the solar beam is inclined, it as more atmosphere to pass through, more atmosphere - more absorption and scattering. Over Wisconsin we get our greatest solar input near June 21 - yet maximum temperatures aren't until late July or early August. How warm it gets depends on the surface - soil, moisture content and vegetation cover. The effects of winds on vertical profile of temperature - mixing.