NASA - National Aeronautics and Space Administration

Tia Ferguson is a NASA engineer who spent four weeks in Antarctica on a science mission. Image Credit: NASA

      the usual weather conditions of a place over a long period of time

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Sentences:
NASA uses many different satellites to study Earth's climate.

Different parts of the United States can have very different climates.

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More Information:
http://www.nasa.gov/worldbook/wbkids/k_climate.html
http://www.nasa.gov/worldbook/wbkids/k_weather.html
http://www.nasa.gov/mission_pages/noaa-n/climate/climate_weather.html