Climate almanac
Monticello
Illinois, United States · 40.03°, -88.57°
What is the weather like in Monticello in October?
In October, Monticello is typically 68°F (20°C) during the day and 48°F (9°C) at night. The month brings about 3.6 in (91 mm) of precipitation in total. Snowfall averages about 0.1 in (3 mm) over the month.
- Average high68°F (20°C)
- Average low48°F (9°C)
- Precipitation3.6 in (91 mm)
- Clear or mostly clear days13
- Snowfall0.1 in (3 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)