Chicago, Illinois, known for its striking skyline and deep-dish pizza, also has a diverse climate that keeps its residents and visitors on their toes year-round.
The city experiences a warm season from June to September, with average daily high temperatures above 73°F.
July is the hottest month, reaching highs of 82°F and dipping to lows of 70°F.
The cold season in Chicago begins in December and lasts until March. During these months, the temperature can drop significantly, often averaging below 43°F.
January stands out as the coldest month, with temperatures ranging from 27°F to 33°F, and on the coldest nights, it can plummet to as low as -2.5°F.
This dramatic shift in temperatures is largely influenced by the city’s proximity to Lake Michigan, which also contributes to higher precipitation levels.
For those planning a visit or considering a move to the Windy City, understanding Chicago’s weather patterns is essential.
The city experiences approximately 33.2 inches of annual precipitation spread over 120 days, ensuring that whether you love crisp winter air or long summer days, Chicago has a season for everyone.
Average Temperature In Chicago, Illinois
Chicago experiences a range of temperatures throughout the year.
Winter months like January and February are usually the coldest months.
In January, the average temperature can drop to 27°F, with lows around 19.9°F and highs only reaching 33.2°F. February is slightly warmer but still quite chilly.
During the spring, temperatures begin to rise.
March sees daily highs of around 50°F, while April offers a more comfortable range with temperatures reaching as high as 61°F.
Summer in Chicago is warm. June sees average high temperatures of about 78°F.
July, the hottest month, has highs averaging 82°F and lows around 70°F.
August follows closely with temperatures slightly dipping as the month progresses.
Fall brings cooler weather back Chicago’s way.
September experiences highs of about 73°F, while October averages around 60°F. By November, temperatures have declined further, with averages around 48°F and lows dipping to about 36°F.
Here is a summary table of the average high and low temperatures for select months:
| Month | Average High (°F) | Average Low (°F) |
|---|---|---|
| January | 33.2 | 19.9 |
| March | 50 | 34 |
| June | 78 | 64 |
| July | 82 | 70 |
| September | 73 | 61 |
| December | 36.5 | 25 |
Hourly average temperatures can vary greatly, with July often seeing high temperatures in the afternoon and December presenting cold evenings. Chicago’s temperature range makes it a city with hot summers and cold, snowy winters.
Average Precipitation In Chicago, Illinois
Chicago experiences varied precipitation throughout the year, with distinct patterns for both rainfall and snowfall.
Average Rainfall In Chicago, Illinois
Rainfall in Chicago is spread fairly evenly across the year, with each month receiving some precipitation. The city averages about 39 inches of rain annually.
The wettest months are typically May and June, each getting around 4 inches of rain.
July and August see slightly less, with about 3.5 inches each.
Rainy days can occur any time of the year, but they are more frequent in the late spring and early summer.
Rain alone is more common than hail, especially during these warmer months.
Average Snow In Chicago, Illinois
Winter in Chicago brings significant snowfall. On average, the city gets about 37 inches of snow each year.
The heaviest snowfalls generally occur in December, January, and February.
January is the snowiest month, averaging around 11 inches of snow.
Snow alone is common during these months, but mixed precipitation can occur. March and November also see some snow, though it’s usually less severe. For more articles on snow, refer to Snow and Ice.
Average Sun In Chicago, Illinois
Chicago experiences varying amounts of sunlight throughout the year, with longer days in summer and shorter ones in winter. The city receives a decent amount of sunshine, contributing to both its warm summers and cold winters.
Average Daily Shortwave Solar Energy In Chicago, Illinois
The amount of solar energy Chicago receives varies significantly by season.
In summer, the city enjoys long days, with up to 15.2 hours of daylight. This is when Chicago receives the most sunlight, especially in June and July.
July is the sunniest month, offering up to 10.6 hours of sunshine daily.
As winter approaches, the daylight decreases. From December to February, Chicago sees around 9 hours of daylight.
Despite the shorter days, winter still provides a fair amount of sunlight, helping to moderate temperatures slightly.
Throughout the year, Chicago averages about 54% of possible sunlight hours.
This means there are plenty of sunny days, even in the colder months, which is essential for residents and visitors alike. For more detailed data, refer to timeanddate.com and Current Results.
Average Humidity In Chicago, Illinois
Chicago experiences varying levels of humidity throughout the year.
In Chicago, the average annual percentage of humidity is 70%. Each month contributes differently to this average.
December stands out as the most humid month with a relative humidity of 76%.
On the other hand, May is the least humid month, averaging around 64% relative humidity.
Here’s a quick look at the monthly average humidity:
| Month | Relative Humidity (%) |
|---|---|
| January | 74 |
| February | 72 |
| March | 69 |
| April | 66 |
| May | 64 |
| June | 65 |
| July | 67 |
| August | 70 |
| September | 71 |
| October | 73 |
| November | 75 |
| December | 76 |
Chicago’s humidity levels can also affect how the weather feels.
High humidity can make hot temperatures feel hotter and cold temperatures feel colder. This is particularly noticeable in the peak summer months of July and August, and during the winter in December and January.
For more detailed data, you can refer to the average humidity in Chicago.
Average Wind In Chicago, Illinois
Chicago is known as the “Windy City.” It experiences varying wind speeds throughout the year.
Wind Speed
The average wind speed in Chicago is about 16 mph. During colder months, winds can be even stronger.
Typical wind speeds are around 18 mph in winter. In summer, winds are usually calmer but still noticeable.
Monthly Wind Averages
| Month | Average Wind Speed (mph) |
|---|---|
| January | 17.5 mph |
| February | 17.6 mph |
| March | 17.0 mph |
| April | 15.9 mph |
| May | 14.0 mph |
| June | 12.5 mph |
| July | 11.8 mph |
| August | 11.7 mph |
| September | 12.5 mph |
| October | 14.7 mph |
| November | 16.2 mph |
| December | 17.0 mph |
Strong Winds
Strong winds are common, influencing both daily life and sports activities. Many outdoor events consider wind conditions in their planning.
Article on wind-related topics at ChaseDay.
Impact on Weather
High wind speeds can make cold temperatures feel even colder. It’s essential to dress warmly during winter.
Wind-Related Activities
Winds in Chicago are favorable for activities like sailing and windsurfing. Sports enthusiasts often take advantage of the windy conditions.
Visitors and residents should be prepared for windy days, no matter the season.
Average Air Quality In Chicago, Illinois
Chicago’s air quality has fluctuations throughout the year, influenced by various factors such as weather, industrial activities, and traffic.
PM2.5 levels in Chicago are generally low. The city often experiences “Good” air quality days. For real-time updates, sites like IQAir provide current data.
Ozone Levels: In 2019, Chicago was labeled by the EPA for exceeding its safe ozone levels. On average, Chicago had about 19.2 unhealthy ozone days per year in the past.
In terms of cloud cover and pollution, cloudy days can sometimes trap pollutants closer to the ground, affecting air quality. Sunny days can worsen ozone levels due to the reaction between sunlight and pollutants.
Key Statistics:
- Average Number of Unhealthy Days per Year: 19.2
- EPA Rating for Ozone: ‘F’ for Cook County
- Common Pollutants: Ozone, PM2.5
Air Quality Index (AQI) Categories:
- Good (0-50): Air quality is satisfactory.
- Moderate (51-100): Air quality is acceptable; some pollutants may be a concern.
- Unhealthy for Sensitive Groups (101-150): Sensitive groups may experience health effects.
For precise information on any particular day, checking sites like AccuWeather can be helpful.
Topography Of Chicago, Illinois
Chicago is located at a latitude of approximately 41.8781° N and a longitude of around 87.6298° W. This places it in the northeastern part of Illinois, near Lake Michigan.
The city’s elevation varies but is generally around 594 feet above sea level. This relatively flat elevation contributes to the city’s expansive urban layout.
The landscape is dominated by the presence of Lake Michigan to the east, which significantly impacts the weather and climate. Due to the flat topography, Chicago sprawls extensively, featuring a variety of neighborhoods and commercial areas.
Chicago is an urban area that combines a lakefront with numerous parks and green spaces. The Chicago River runs through the city, adding unique aspects to the city’s infrastructure.
Here’s a quick overview:
| Feature | Details |
|---|---|
| Latitude | 41.8781° N |
| Longitude | 87.6298° W |
| Elevation | 594 feet above sea level |
A network of streets and highways crisscrosses the area, making it accessible and well-connected to surrounding regions. Despite its mostly flat terrain, the city has developed a dynamic and vibrant environment due to its strategic location and urban planning.
Extreme Weather Events That Occur In Chicago, Illinois
Chicago experiences a variety of extreme weather events throughout the year. These events significantly impact the daily lives of residents and can create challenging conditions.
Tornadoes
Illinois has seen an increase in tornado activity. Recently, a record-breaking 31 tornadoes hit the Chicago area in a single storm event, surpassing the previous record of 22 tornadoes. These storms can lead to severe damage to homes and infrastructure.
Heatwaves
Chicago often experiences extreme heat, especially during the summer months. The highest recorded temperature is 105°F, which occurred on July 24, 1934. Heatwaves can pose serious health risks, particularly for vulnerable populations.
Flooding
Heavy rainfalls can lead to flooding, causing significant problems. Floods can disrupt transportation, damage property, and affect the city’s infrastructure. Recently, severe weather has caused flooding and extreme heat in the region, impacting many residents.
Extreme Cold
Winters in Chicago can be brutally cold. The lowest recorded temperature is -27°F, which occurred on January 20, 1985. Such extreme cold affects transportation, health, and daily activities.
Snowstorms
Chicago also experiences heavy snowstorms. These storms can lead to road closures, flight cancellations, and power outages. Snow can accumulate rapidly, making it difficult for residents to commute and conduct daily activities.
Record Highs and Lows
- Warmest Month: July 1955, with an average of 81.3°F
- Coldest Month: January 1977, with an average of 10.1°F
Best Time Of The Year To Visit Chicago, Illinois
The best time to visit Chicago depends on your weather preferences and activities. Spring and fall offer mild temperatures and fewer crowds, while summer is ideal for festivals and outdoor activities. Winter is cold but offers unique experiences.
What Is Chicago, Illinois Like In Spring
Spring in Chicago spans from April to May, featuring mild temperatures ranging from the mid-40s to mid-70s Fahrenheit. The city starts to thaw from its winter freeze, with blooming flowers and green parks. Popular sights such as Millennium Park and the Chicago Riverwalk become vibrant with the arrival of warmer days.
Rainfall is moderate, averaging about 3 inches per month. Tourists enjoy fewer crowds, making it a great time for sightseeing and visiting museums. There are also several festivals and parades, like the Chicago Flower and Garden Show. Spring is perfect for those who prefer cool but pleasant weather along with cultural attractions.
What Is Chicago, Illinois Like In Summer
Summer in Chicago, lasting from June to August, is prime time for visitors. Temperatures range from 70°F to 85°F. Lake Michigan’s beaches are crowded with people enjoying water sports and sunbathing. The city buzzes with outdoor concerts, food festivals, and events like the Taste of Chicago and Lollapalooza.
Rain is also common, with about 4 inches per month, but it rarely spoils the fun. The warm weather and long days make it ideal for hiking at the Lincoln Park Conservatory or exploring the Navy Pier. With a high tourism score, summer is perfect for warm-weather activities and lively city experiences.
What Is Chicago, Illinois Like In Fall
Fall, from September to October, offers a beautiful transition with cooler weather, ranging from 50°F to 70°F. Leaves change color, providing a picturesque backdrop at places like Lincoln Park and the Morton Arboretum. The crowds from summer start to thin, making it a great time for more relaxed exploration.
Rainfall decreases to around 2 inches per month. This season features events like the Chicago International Film Festival and Oktoberfest. Fall is ideal for travelers who enjoy mild weather and fewer crowds while still experiencing plenty of activities and sights.
What Is Chicago, Illinois Like In Winter
Winter in Chicago spans from November to March, featuring cold temperatures from the mid-20s to mid-30s Fahrenheit.
Snowfall is common, averaging about 10 inches per month, making it a winter wonderland.
Despite freezing weather, the city offers unique attractions like ice skating at Millennium Park and the Christkindlmarket.
Tourists can score deals on accommodations since winter sees fewer visitors.
Wind chills can make it feel even colder, especially near Lake Michigan.
Winter is best for those who don’t mind the cold and want to enjoy holiday festivities and indoor attractions, such as museums and theaters.