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.

• Original COOP Observation Forms
  Daily observations provided on handwritten or computer-generated forms. These may include remarks or additional information supplied by the observer. Available one month at a time.
• COOP Data with a 24-hour Lag
  Electronically generated and available for more than 85% of COOP stations. Data do not include remarks and additional information supplied by the observer. Generally available within 24 hours of observation. 
• FTP: 15-Minute Precipitation (3260)
• FTP: Hourly Precipitation (3240)
• Global Historical Climatology Network - Daily (GHCND)
  GHCN-Daily is the official archived dataset, and it serves as a replacement product for older NCEI-maintained datasets that are designated for daily temporal resolution (i.e., DSI 3200, DSI 3201, DSI 3202, DSI 3205, DSI 3206, DSI 3208, DSI 3210, etc.).