Jimmy the Groundhog predicts spring's arrival every year in Sun Prairie SUN PRAIRIE, Wis. — The City of Sun Prairie is holding a virtual ceremony to celebrate the 73rd annual Sun Prairie Groundhog Day Prognostication. A news release said the ceremony will start at 7 a.m. on Feb. 2., with Jimmy the Groundhog making his prediction at sunrise. Jimmy’s built a reputation for being one wise woodchuck, as city officials say he “has an extremely high accuracy rate on his annual predictions, making him an outstanding leader in meteorological circles.” His keen eye and perceptive snoot will determine whether we have an early spring or extended winter.