Oak Park (IL) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Oak Park, Illinois, United States of America. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Now, let's break down all the details for a clearer picture.

Oak Park has a notably wet climate with abundant precipitation, recording 1098 mm (43 in) of rain/snowfall per year.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, August receives substantial rainfall, averaging 133 mm (5.2 in) of precipitation, recorded across 10 rainy days.

In contrast, the driest month, January brings less snowfall, with 53 mm (2.1 in) over 10 snowy days.

August, the wettest month, has a maximum daytime temperature of 28°C (82°F). The city receives 280 hours of sunshine in this period. During the driest month January you can expect a temperature of 0°C (32°F). For more detailed insights into the city's temperatures, visit our Oak Park Temperature page.

Annual Rainfall in the United States of America: City Comparison

The map below shows the annual precipitation across the United States of America. You can also select the different months in case you are interested in a specific month.

Annual

Annual

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Legend

heavy rainfall

high

moderate

low

almost none

Heavy annual rainfall has been defined as more than 1000 mm (39 in) precipitation. High: 600 mm (24 in) to 1000 mm (39 in). Moderate: 250 mm (9.8 in) to 600 mm (24 in). Low: less than 250 mm (9.8 in).

Oak Park vs World: Rainfall Compared

Oak Park's average annual precipitation is 1098 mm (43 in). Let's compare this to some popular worldwide tourist destinations:

Seville, Spain, experiences 541 mm (21 in) of rainfall annually, with wet winters and dry summers typical of southern Spain.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.

In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Rainy Seasons: Many parts of the world have well-defined wet seasons where precipitation is distinctly higher. These are normally accompanied by lush vegetation and temperature patterns.

Dry Seasons: In areas where the climate is either desert or Mediterranean, the amount of precipitation is drastically reduced, leading to a shortage of water and arid conditions.

Interesting weather facts

"Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.

For more detailed information about Oak Park (IL)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Oak Park (IL) Climate page.

Current rainfall in Oak Park (IL)

10-Day Forecast