ClimateForecastNovemberDecember >>

Oswego (IL) Climate by Month

The climate in Oswego is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to very cold in 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

In Oswego, temperatures differ significantly between summer and winter months. 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 -10°C during this month.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Oswego experiences significant rain/snowfall throughout the year, averaging 1029 mm of precipitation annually. Oswego can be quite wet during June, receiving approximately 130 mm of precipitation over 14 rainy days. In contrast January, experiences much drier conditions, with 47 mm of snowfall, spread across 10 snowy days.

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

Sunshine over the year

Oswego 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 (50 KM, 31 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (50 KM, 31 Miles).

The best time of year to visit Oswego 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 Oswego?
    The hottest season / summer takes place in June, July, August and September.
  • When is winter in Oswego?
    The coldest season / winter is in the following months: January, February and December.
  • Which is the warmest month in Oswego?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Oswego?
    The coldest month is January with an average maximum temperature of -1°C.
  • Which is the wettest month in Oswego?
    June tops the wettest month list with 130 mm of rainfall.
  • Which is the driest month in Oswego?
    January is the driest month with 47 mm of precipitation.
  • Which is the sunniest month in Oswego?
    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 Oswego (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
    12°C | 1°C
    S 18 km/h
    broken clouds and no rain

    broken clouds and no rain

    Mon   Nov 25
    10°C | -2°C
    NW 29 km/h
    overcast and no rain

    overcast and no rain