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Over the winter, a relative lack of the sun's warmth means most moisture collected on the earth's surface stays there -- it doesn't evaporate. In spring, warming temperatures cause more moisture to return to the air in the form of water vapour. More moisture in the air means more potential for precipitation -- rain (or snow, or hail). Once the summer months return, the amount of moisture left on the surface decreases, so less water vapour returns to the sky to fall as precipitation.

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17y ago

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