Welcome to WxCoder – the official web-based entry system for the National Weather Service (NWS) Cooperative Observer Program (COOP)! Combined with IV-ROCS, the telephone entry system, WxCoder offers the means for daily entry of weather records for COOP volunteers. WxCoder is sponsored by the National Oceanic and Atmospheric Administration (NOAA) through the National Weather Service, the Regional Climate Center Program and the National Centers for Environmental Information (NCEI, formerly the National Climatic Data Center, or NCDC).

COOP consists of thousands of dedicated volunteers that take observations on farms, in urban and suburban areas, National Parks, seashores, and mountaintops. The input data are truly representative of where people live, work and play. Since 1890, COOP has fulfilled key mission elements:

• To provide observational meteorological data, usually consisting of daily maximum and minimum temperatures, snowfall, and 24-hour precipitation totals, required to define the climate of the United States and to help measure long-term climate changes
• To provide observational meteorological data in near real-time to support forecast, warning and other public service programs of the NWS.

The collection of COOP information is authorized under OMB Control Number 0648-0828 (exp. 9/30/2027) and as described in the Citizen Science & Crowdsourcing Information Collection.

Log in to report your daily observations.