Historical weather data, all-time temperature records, and monthly climate averages for Monroe, WI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Monroe sits in that classic spring-on-the-fence zone — an average high of 53° with a low still dipping to 30°. The date has seen everything from a balmy 78° back in 2005 to a brutal 18° overnight in 2018. There's a modest 28% chance of rain, but snow is nearly off the table at just 1%.
Monroe's weather has real teeth at both ends of the thermometer — 104° in July 2012 and -28° in January 2009 represents a jaw-dropping 132-degree swing in the historical record. A single July day in 1996 dropped 10.1 inches of rain, and December once buried the area under 12 inches of snow in 24 hours.
Monroe's warmest stretch runs early July, where average highs peak around 84°, while mid-January bottoms out at a frigid 26°. If you're rain-averse, avoid mid-June — the week of June 11–17 is the wettest of the year, averaging 1.3 inches. Spring and fall offer the mildest shoulder seasons, with April and October averaging highs in the upper 50s to low 60s.