



NWS Chicago County Warning Area (CWA), a 23 county area that includes a large portion of northern Illinois and northwest Indiana. Much of the information is for two official climate sites, Chicago and Rockford, as these locations have longtime, quality-controlled climate data.



Besides climatology, this page can serve to help with snowfall risk assessment in terms of time of year, frequency, and magnitude. For more on specific snow events of the past, please visit our Past Events Page, WPC Storm Summaries, and the NCEI Storm Events Database. This page houses climatological snowfall data for the(CWA), a 23 county area that includes a large portion of northern Illinois and northwest Indiana. Much of the information is for two official climate sites, Chicago and Rockford, as these locations have longtime, quality-controlled climate data.Besides climatology, this page can serve to help with snowfall risk assessment in terms of time of year, frequency, and magnitude. For more on specific snow events of the past, please visit our, and the



