The National Weather Service (NWS) Cooperative Observer Program (COOP) is truly the Nation's weather and climate observing network of, by and for the people. More than 11,000 volunteers take observations on farms, in urban and suburban areas, National Parks, seashores, and mountaintops. The data are truly representative of where people live, work and play.

The COOP was formally created in 1890 under the Organic Act. Its mission is two-fold:

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.

For more information click here.


How to use this site.

This website is dedicated to OSNW3 climatology.  Here you will find daily observations, historical data & graphs, past radar loops, a live webcam, a blog, photos, and whole lot more.  Use the navigation menu to the left.  If an observation date or description is linked, there is a photo or radar loop to go along with that observation.  Questions or comments please email me.  Enjoy.

*Data updated every 24 hours.
*Precipitation measured in Inches.
*Temperature measured in degrees Fahrenheit.


 High TempLow TempPrecipSnowfallSnow Depth  :  Previous 24hrs, NWS MKE (All of WI)
 High TempLow TempPrecipSnowfallSnow Depth  :  Previous 24hrs, NWS GRB (Northeast WI)

 PrecipSnowfallSnow Depth  :  Previous 24hrs, CoCoRaHS (All of WI)
 PrecipSnowfallSnow Depth  :  Previous 24hrs, CoCoRaHS (Winnebago County) - Snow Season Compare

** Experimental Snowfall Analysis (NWS)
** Google Precipitation Mapping (CoCoRaHS)
** Long Range Forecasting (consonantchaos.com)

Wisconsin COOP Network | Precipitation data provided for the NWS Green Bay, WI & CoCoRaHS