* Data from weather station: Chicago, United States of America. The wetter season lasts 7.0 months, from March 28 to October 30, with a greater than 26% chance of a given day being a wet day. The climate of Chicago is classified as hot-summer humid continental (Köppen: Dfa), with all four seasons distinctly represented: Winters are cold and see frequent snow and near 0 °F (−18 °C) windchill temperatures, while summers are warm and humid with temperatures being hotter inland, spring and fall bring bouts of both cool and warm weather and fairly sunny skies. In most years, a period of warm weather, known as an Indian summer, occurs well after the autumnal equinox has occurred. Showing: All Year January February March April May June July August September October November December Geoba.se offers facts and statistics about more than 8,000,000 locations worldwide, including the population, county, post-code, qiblah, coordinates, local webcams, Wikipedia articles and more. The lowest temperature recorded in the meteorological summer months is 35 °F (2 °C), set on June 4, 1945. Chicago experiences significant seasonal variation in the perceived humidity. Mean monthly maxima and minima (i.e. The hottest day of the year is July 18, with an average high of 83°F and low of 71°F. The stations contributing to this reconstruction are: Chicago / Meigs (72%, 4.6 kilometers, northeast); Chicago Midway International Airport (19%, 11 kilometers, southwest); Chicago O'Hare International Airport (5%, 26 kilometers, northwest); and Naval Air Station Glenview (historical) (4.2%, 30 kilometers, northwest). Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. Thunderstorms and severe weather. A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. Everything in between is wonderful. All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. The wind is most often from the west for 3.6 months, from November 18 to March 5, with a peak percentage of 41% on January 1. [39] On December 24, 1983, and January 18, 1994, the high temperature reached only −11 °F (−24 °C). Average Weather in Chicago Illinois, United States. The chance of a wet day peaks at 37% on May 26. [32] Thunderstorms can occur any time of the year, but are most prevalent in the springtime as the city's central location within the United States as well as its lakeside location makes it a center of conflicts between large volumes of warm and cold air, which can trigger a wide variety of severe weather. "Precipitation Rankings for January for Chicago, Illinois", "February Precipitation Rankings for Chicago, IL", "July Precipitation Amounts for Chicago, IL", "August Precipitation Amounts for Chicago, IL", "History of the Chicago and Rockford weather observation sites", "Chicago, Illinois Köppen Climate Classification (Weatherbase)", "GLOBAL ECOLOGICAL ZONING FOR THE GLOBAL FOREST RESOURCES ASSESSMENT 2000", "Top 20 Weather Events of the Century for Chicago and Northeast Illinois 1900–1999", "Chicago, IL - Detailed climate information and monthly weather forecast", https://www.weather.gov/lot/observation_history, National Oceanic and Atmospheric Administration, "Chicago/O'Hare, IL Climate Normals 1961-1990", "1981–2010 Normals – Data Tools – Climate Data Online (CDO) – National Climatic Data Center (NCDC)", "Sub-zero temperatures end 711-day streak Tuesday – Philadelphia News, Weather and Sports from WTFX FOX 29", https://abc7chicago.com/weather/chicago-weather-polar-vortex-brings-record-cold-wind-chill-warning-in-effect/5114090/, https://abc7chicago.com/weather/steam-rises-off-lake-michigan-in-chicago-as-temps-plunge/5113047/, https://www.nytimes.com/2019/01/30/us/extreme-cold-weather.html, "How cold is it? The wettest month … 03-03-2008, 06:42 PM dragoro : Location: chicago. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Chicago experiences some seasonal variation in monthly liquid-equivalent snowfall. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. [27] There have been streaks of multiple winter seasons without a single subzero reading, yet there have also been winters with 20 or more subzero readings. Our climate & weather tool can help. The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The last couple of 80 °F (27 °C) days in this record-breaking stretch of warmth occurred after the vernal equinox. In addition, it includes a realtime currency converter for more than 150 currencies. [16] Daily snow depth has amassed as high as 29 in (74 cm) on January 14, 1979; as of 2019[update], January 1979 alone holds the first 8 of the top 10 daily snow-depth measurements. Chicago is known as the Windy City. For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Derechos are also common during the summertime, the most notable being, the August 4, 2008 derecho, which produced 5 tornadoes across the Chicago area and killed 1 person. Winter in Chicago is generally cold and snowy. In 2012, there were eight days in the month of March with temperatures 80 °F (27 °C)+ (with a ninth day occurring in many suburban areas) during the record-breaking March 2012 North American heat wave. The lowest temperature recorded in meteorological spring is −12 °F (−24 °C), set on March 4, 1873. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. The brighter period of the year lasts for 3.5 months, from May 5 to August 20, with an average daily incident shortwave energy per square meter above 5.9 kWh. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. On top of that, during the same warm stretch in October 2005, for two consecutive days the overnight temperature failed to drop below 70 °F (21 °C), a rare occurrence for Chicago in October. Chicago Weather in July: The heat is on in July as it’s not only the hottest month of year but also the month that receives the most sunlight. How is Chicago weather year round? See long range weather forecasts for the next 60 days for the Lower Lakes Region. November to March is when weather this cold can last all day. Although it is extremely rare, temperatures during late winter (generally March 1–20) can reach up to and well over 80 °F (27 °C). For the purposes of this report, the geographical coordinates of Chicago are 41.850 deg latitude, -87.650 deg longitude, and 584 ft elevation. It is also believed to be called the "Windy City" because of politicians in the area blowing hot air. The figure below presents a compact representation of key lunar data for 2020. Chicago, IL Monthly Weather 5:09 pm CST Dec 2019 Jan 2020 Feb 2020 Mar 2020 Apr 2020 May 2020 Jun 2020 Jul 2020 Aug 2020 Sep 2020 Oct 2020 Nov 2020 … The darker period of the year lasts for 3.4 months, from November 1 to February 12, with an average daily incident shortwave energy per square meter below 2.7 kWh. Autumn can bring heavy rain showers, some of which are capable of producing serious flooding. The heaviest calendar day snowfall was 18.6 in (47.2 cm), again at O'Hare, on January 2, 1999. Temperatures in April typically range in the 50s°F (10 – 15°C), while May can reach up to around 70°F (21°C). The most severe storms can contain large hail, damaging straight-line winds, flooding, and tornadoes. In Chicago, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. Chicago, Illinois experiences a wide range of temperatures, with blasts of cold weather in winter and hot days in summer. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. [16], Official monthly mean temperatures have ranged from 10.1 °F (−12.2 °C) in January 1977 to 81.3 °F (27.4 °C) in July 1955, both recorded at Midway,[16] while the annual mean temperature has ranged from 45.1 °F (7.3 °C) in 1875, as recorded at the Roanoke Building, to 54.5 °F (12.5 °C), as recorded at O'Hare. Temperatures can also reach extreme levels of heat on the immediate shoreline, such as when the air temperature reached 105 °F (41 °C) at Northerly Island during the aforementioned July 2012 heat wave. Freezing temperatures can occur anytime from November to April in Chicago. Because of the closed-loop circulation pattern with a lake breeze that moves back and forth across the city, it is thought to significantly increase low-level ozone counts. Get the monthly weather forecast for Chicago, IL, including daily high/low, historical averages, to help you plan ahead. The wind is most often from the north for 1.7 months, from March 5 to April 26, with a peak percentage of 29% on March 9. [25] Most winters produce many snow falls during the season in light accumulations of around 2 in (5.1 cm). Chicago can be cooler and moister than other parts of Illinois because of its proximity to the relatively cooler waters of Lake Michigan, effects which are most pronounced during spring and early summer. Although extremely rare, temperatures at or above 70 °F (21 °C) have been recorded into early December, most recently in 2012 when 70 °F (21 °C) was recorded on December 3, some surrounding areas reaching temperatures as high as 72 °F (22 °C) to 75 °F (24 °C). This section reports on the wide-area average surface temperature of that water. Chicago weather averages and climate Chicago, Illinois. Chicago's coldest day on record was on January 20,1985. CHICAGO (CBS)– Cool temperatures will be followed by rain this weekend. This report illustrates the typical weather in Chicago, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Click on each chart for more information. To characterize how pleasant the weather is in Chicago throughout the year, we compute two travel scores. Are the winters snowy or usually just mild. The thin dotted lines are the corresponding average perceived temperatures. South, west and southwestern suburbs can be more than 20 °F (11 °C) warmer than the lakefront at some times of year. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . The University of Chicago is close to the lake, which can and does reduce temperatures in the immediate shoreline area in the summer. The clearer part of the year in Chicago begins around June 10 and lasts for 4.5 months, ending around October 28. However in late January 2019, a violent polar vortex drifted southward, enveloping the city in new record-breaking temperatures as low as −23 °F (−31 °C) on January 30. The warming effect of Lake Michigan during the winter makes subzero temperatures somewhat less common on the lakefront than in the more inland parts of the city. In Chicago, the summers are warm, humid, and wet; the winters are freezing and windy; and it is partly cloudy year round. Of the two major airports located in Chicago, Midway Airport began observations in 1928, and O'Hare Airport began them in 1958. However, like much of the northern USA, can vary tremendously within the span of one week. There's a saying in Chicago, "Only a fool or a tourist would dare to predict the weather." It is believed to have been created by a New York newspaper writer deriding Chicagoans' bluster as they promoted their city as the site of the 1893 Columbian Exposition. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. During the autumn, the effects of Lake Michigan are usually reversed from the spring or summer, particularly in the late autumn. On average, December is the most humid. The city typically sees less snow in winter than other major cities near the Great Lakes, such as Cleveland or Buffalo, but more snow than that experienced on the East Coast in cities like Washington DC or New York City. However, in the 2012–13 winter season, the first measurable snow did not fall until December 20, 2012, eclipsing the previous record of December 17, 1899. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). The average hourly temperature, color coded into bands. The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The effects of the cold front did not affect many suburban areas, as temperatures reached or exceeded 100 °F (38 °C) for a fourth consecutive day throughout much of the region. The figure below shows you a compact characterization of the entire year of hourly average temperatures. Official records for Chicago were kept at various locations in downtown from January 1871 to 31 December 1925, University of Chicago from 1 January 1926 to 30 June 1942, Midway Airport from 1 July 1942 to 16 January 1980, and at O'Hare Airport since 17 January 1980. The average Chicago winter produces 94 cm (38 inches) of snow. In Chicago, the summers are warm, humid, and wet; the winters are freezing and windy; and it is partly cloudy year round. We have todays weather, high temperature, low temperature, rainfall, precipitation, snow, sun, clouds, humidity, and wind. Our first Weatherbase companion site. We assume no responsibility for any decisions made on the basis of the content presented on this site. MERRA-2 Modern-Era Retrospective Analysis. The windiest day of the year is January 4, with an average hourly wind speed of 14.4 miles per hour. The official reading of 105 °F (41 °C) for that day was taken at the University of Chicago campus near the shoreline off Lake Michigan. In that heat wave, temperatures at the lake remained in the middle and upper 90s Fahrenheit (middle 30s Celsius), whereas Midway Airport recorded temperatures over 100 °F (38 °C) for nearly two weeks, peaking at 107 °F (42 °C) on July 11. The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. The snowy period of the year lasts for 3.5 months, from December 1 to March 18, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. In addition, the all-time record low maximum temperature of −11 °F (−24 °C) was set on December 24, 1983, and tied on January 18, 1994. The time of year with cooler water lasts for 4.9 months, from December 11 to May 9, with an average temperature below 43°F. support@__remove_this_part__weatherspark.com. Average Weather in January in Chicago Illinois, United States. However, wild weather can and does occur in the region during this season. Typically, the last freezing low of the season on average occurs on April 13 at Midway and ten days later at O'Hare. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. Wettest Year: 2008 with 50.86" Driest Year: 1962 with 22.22" Wettest Month: August 1987 with 17.10" Driest Month: September 1979 with 0.01" Spring in Chicago is perhaps the city's most unpredictable season: Winter can last until April or even May, with the 1953-54 winter in Chicago lasting from November until May, as measured by timespan between the first and last measurable snows of the season. Averages are for Chicago Midway Airport, which is 9 miles from Chicago. 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