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Glen Ellyn (IL) Climate by Month

The temperature in Glen Ellyn can vary quite a bit throughout the year. Temperatures can be warm during the warmest months, and very cold during the cooler months. It also experiences much rain/snowfall throughout the year. Let's now guide you through the climate details for a complete overview.

Average day and night temperature

Visitors to Glen Ellyn can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 29°C in July. In January, the coolest month of the year, temperatures drop to a very cold -1°C. At night, expect cooler temperatures, averaging -9°C during this month.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Glen Ellyn is known for its substantial rain/snowfall, with annual precipitation reaching 1063 mm. Glen Ellyn can be quite wet during June, receiving approximately 129 mm of precipitation over 14 rainy days. In contrast January, experiences much drier conditions, with 52 mm of snowfall, spread across 10 snowy days.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Glen Ellyn can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 3.6 hours of sunlight per day.

Monthly hours of sunshine

Data from: Chicago, the United States of America (18 KM, 11 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (18 KM, 11 Miles).

The best time of year to visit Glen Ellyn in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Glen Ellyn?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Glen Ellyn?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Glen Ellyn?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Glen Ellyn?
    The coldest month is January with an average maximum temperature of -1°C.
  • Which is the wettest month in Glen Ellyn?
    June tops the wettest month list with 129 mm of rainfall.
  • Which is the driest month in Glen Ellyn?
    January is the driest month with 52 mm of precipitation.
  • Which is the sunniest month in Glen Ellyn?
    July is the sunniest month with an average of 319 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Glen Ellyn (IL)

    Sat   Nov 23
    7°C | 1°C
    SW 14 km/h
    broken clouds and no rain

    broken clouds and no rain

    Sun   Nov 24
    11°C | 1°C
    S 14 km/h
    broken clouds and no rain

    broken clouds and no rain

    Mon   Nov 25
    10°C | -2°C
    NW 25 km/h
    overcast and no rain

    overcast and no rain