 July is the warmest month with an average of 69.2 °F (20.7 °C), while January is the coldest month with an average of 22.6 °F (-5.2 °C).The record high and low temperatures are 98 °F (36.7 °C) and -21 °F (-29.4 °C).The plant hardiness zone is 5b with an average annual extreme minimum air temperature of -11.4 °F (-24.1 °C).