Range Areas of the United States Range Areas of the United States Climatic conditions vary widely in the United States. Mean annual precipitation ranges from less than 12 to more than 250 cm.
Temperatures vary from subtropical to perpetual snow cover.
Altitude, which has a great influence on temperature and rainfall, ranges from 95 m below sea level in Death Valley to more than 4700 m above sea level in the adjacent mountains. Variation in latitude also influences temperature, day length and length of the growing season.