Historical weather data, all-time temperature records, and monthly climate averages for Monticello, MN. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Monticello sits squarely in the thaw — expect a high near 49° and a low around 28°, with only a 16% chance of precipitation. But the date has a wild range: it hit 78° as recently as 2021, then bottomed out at a brutal 4° just three years earlier in 2018.
Monticello earns its Minnesota credentials with an all-time low of -40° set in January 1943, and an all-time high of 102° reached in June 2021 — a 142-degree spread that tells you everything about this climate. A single April storm in 2013 dumped 15 inches of snow, and a June cloudburst in 2003 dropped 6.6 inches of rain in one day.
Summer is the clear sweet spot, with highs peaking around 84-85° in early July and the wettest stretch arriving mid-June, averaging over an inch of precip that week. Winters are serious — January highs barely crack 22° — so plan accordingly if you're visiting between November and March. Spring and fall offer a brief but pleasant shoulder season in the 40s-70s.