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Due to scheduled maintenance, many NCEI systems will be unavailable on Saturday, August 24 from 11:30 AM ET to 1:30 PM ET. We apologize for any inconvenience.

Cooperative Observer Network (COOP)

Through the National Weather Service (NWS) Cooperative Observer Program (COOP), more than 10,000 volunteers take daily weather observations at National Parks, seashores, mountaintops, and farms as well as in urban and suburban areas. COOP data usually consist of daily maximum and minimum temperatures, snowfall, and 24-hour precipitation totals. These data may include additional hydrological or meteorological data such as evaporation or soil temperatures. Online data access is provided at no charge. If you would like to order certified copies, please visit the Certification of Data page.