TODAY JUL20
TEMPERATURE74
HUMIDITY79
PRESSURE29.77
WIND COND.190 10.3
  • 8266Fri50%50%
  • 7966Sat30%40%
  • 7965Sun30%40%
  • 8366Mon
  • 8568Tue
daynightWeather update from University of Illinois - Willard at

Monticello Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January-18°F66°F28°F2.7"
February-9°F63°F28°F2.0"
March9°F81°F41°F2.7"
April21°F90°F52°F3.8"
May28°F96°F63°F3.2"
June48°F95°F73°F3.8"
July43°F95°F73°F4.9"
August44°F95°F73°F2.6"
September37°F95°F66°F3.0"
October25°F93°F54°F3.9"
November12°F75°F42°F2.9"
December-5°F63°F29°F2.9"

Did you know?

  • The highest monthly average temperature in Monticello for June is 73 degrees.
  • The lowest monthly average temperature in Monticello for February is 28 degrees.
  • The most monthly precipitation in Monticello occurs in July with 4.9 inches.
  • The air quality index in Monticello is 27% better than the national average.
  • The pollution index in Monticello is 86% better than the national average.

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Compare Monticello, IL Weather To Other Cities

Monticello air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexMonticelloIllinoisNational
Air quality index364150
Pollution index703,2183,347,2955,066,862

Monticello air quality information

MeasurementTotal
Days measured365
Days with good air quality311
Days with moderate air quality54
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Monticello air quality information

PollutantTotal
Arsenic0.001%
Benzene0.020%
Carbon Tetrachloride0.000%
Lead0.000%
Mercury0.000%

Average monthly Monticello temperature with heat index

Monticello monthly precipitation with daily maximum

Monticello monthly snow depth with daily maximum

Monticello monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
De Land, IL4613628%
Lake of the Woods, IL2,6873628%
Seymour, IL3673628%
Bondville, IL5153628%
De Witt, IL2213628%
Monticello, IL5,6093628%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Portland, CT5,607468%
Morris Plains, NJ5,612536%
Avra Valley, AZ5,606468%
South Apopka, FL5,6133628%
Exeter, PA5,6054020%
Monticello, IL5,6093628%
Source: The Monticello, IL weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.