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How does latitude affect the amount of solar radiation a place receives?

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World map with continents shaded in colors representing climate zones, from warm reds and yellows near the equator to cool blues and whites at the poles. — Climate Even in our warming world, there will be some chilly evenings.

Latitude is a primary factor in determining the amount of solar radiation a location receives, primarily through its influence on the solar elevation angle and the length of daylight.1

Solar Elevation Angle

The intensity of solar energy depends on the angle at which the Sun's rays strike the surface. When the Sun is at a high elevation angle (closer to 90°), the energy is concentrated. Conversely, at higher latitudes where the Sun’s elevation angle is lower, the same amount of solar energy is spread over a larger surface area, making it less intense. This angle changes systematically based on latitude, the time of day, and the time of year.1

Length of Daylight

Latitude also dictates the duration of sunlight. Near the Equator, daylight remains relatively constant at 12 hours throughout the year. However, for latitudes poleward of 66.5°, the length of day varies drastically, ranging from zero during the winter solstice to 24 hours during the summer solstice. These variations in solar intensity and daylight duration are fundamental to the climatic differences observed across different latitudes.1