Historical weather data, all-time temperature records, and monthly climate averages for Beaver Dam, WI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Beaver Dam is a true shoulder-season day — historically averaging a high of 50° and a low of 31°, with winter still capable of biting back. The coldest this date ever got was 11° back in 1995, though a warm spell in 1893 pushed the mercury all the way to 69°. There's about a 1-in-3 chance of some precipitation today, but snow is nearly off the table.
Beaver Dam knows extremes — 138 degrees separate its all-time records, from a brutal -36° in January 1963 to a scorching 102° in July 2012. A single July day in 1983 dropped 5.8 inches of rain, and a February storm in 2006 buried the area under 14 inches of snow. This is classic upper Midwest weather: anything is possible, and the climate keeps you honest.
Summer is the sweet spot — the week of July 16–22 averages a high of 84° and is also the wettest stretch of the year, so pack accordingly. Winters are legitimately cold, with mid-January highs averaging just 25°. Spring arrives quickly through April and May, making those months a solid window if you want mild weather without the summer humidity.