Temperature+Maps

**Temperature maps**
MAPS:

North America Temperature Forecast

U.S. Current Temperatures

BACKGROUND: More to temperature than you might think
 * What is temperature? (For the clearest definition, see the “Weather terms” chart in the background article.)
 * What are the two most important factors in temperature?
 * Why is it usually cooler at night?
 * Why does temperature change during the seasons?