Historical weather data, all-time temperature records, and monthly climate averages for Franklin, WI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Franklin sits right on the edge of winter's retreat — the average high is just 48° with lows still dipping to freezing. This date has swung wildly over the decades, from a balmy 67° in 1981 to a brutal 15° low the very next year.
Franklin's weather has real teeth: the thermometer has reached 102° and plunged to -26°, a 128-degree swing between extremes. The wettest single day on record dropped a staggering 8.76 inches of rain in August 2025, and a 1974 February storm buried the area under 13.6 inches of snow in one shot.
Summer is the sweet spot, with highs peaking in the low-to-mid 80s during late July before gradually easing into fall. If you're cold-averse, avoid mid-January, when average highs barely crack 27°. Pack an umbrella for early June — it's the wettest week of the year, averaging over an inch of rain.