The climate is influenced by Lake Michigan and to a lesser extent Lake Erie. Temperature differences between daily highs and lows average about 20. The average occurrence of the last freeze in the spring is late April and the first freeze in the autumn in mid-October, making the average growing season 173 days. The length of the growing season is favorable for the maturing of all crops and vegetable normally grown in the Midwest. Annual precipitation is well distributed with somewhat larger amounts in late spring and early summer.
Dense fog is relatively infrequent.
There in an average of 39 thunderstorm days per year at Fort Wayne with most occurring from May to August. There are around 10 days with severe weather in the Fort Wayne area per year. Winter thunderstorms occur about twice per year. Measurable precipitation typically falls on 132 days of the year. Mid-winter through early spring is the wettest time of year, with autumn the driest.