Sun's energy in Whitehorse
Insolation (Incoming Solar Radiation) is the amount of solar radiation incident on any surface.. The amount of insolation received at the surface of the Earth is controlled by the angle of the sun, the state of the atmosphere, altitude, and geographic location. The graph to the left shows average solar insolation at different latitudes. The Whitehorse graph, in red, shows energy above 300 watts per square meter occours between mid-April to early September. Lags in the earth cooling creates a growing season the lasts beyond September 1.