Visiting local bars in Rockford is more fun when the weather is good. These rainfall averages and temperatures can help you choose the best time for bar-hopping. The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Rockford are January, March, December and November, with each month seeing an average of 16 cm of snowfall.