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In page Geography of Afghanistan:

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The Afghan climate is very dry. Rainfall in Afghanistan is very scarce, and mainly only affects the northern highlands, arriving in March and April. Rainfall in the more arid lowlands is rare, and can be very unpredictable.[1] The climate is characterized by great differences of summer and winter temperature and of day and night temperature, as well as the extent to which change of climate can be attained by slight change of place. The sun shines for three-fourths of the year, and the nights are clearer than the days.[citation needed]