Daily insolation levels tend to vary with latitude because the angle of the sun's rays and day length both vary with latitude.

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Daily insolation levels are affected by the angle of the sun's rays and the length of the day; both of these factors vary with latitude. At the equator, for example, the sun's rays hit the earth more directly, resulting in a higher level of insolation, while at higher latitudes the angle of the sun's rays is more oblique, resulting in a lower level of insolation. Additionally, the length of the day varies with latitude due to the earth's axial tilt, which affects the amount of time that the sun is above the horizon.

Daily Insolation Levels Tend to Vary with Latitude Because the Angle