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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

NORMALS

JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC

Day of MonthHighLowAverageHDDCDDPrecipitationSnowfall
13217244100.060.3
23117244100.070.3
33117244100.060.4
43117244100.060.3
53117244100.060.3
63117244100.070.3
73117244100.060.4
83117244100.060.3
93117244100.060.4
103117244100.060.3
113116244100.060.3
123116244100.060.4
133116244100.050.3
143116244100.060.4
153116244200.060.3
163116244200.050.3
173116234200.060.4
183116234200.050.4
193116234200.050.4
203116234200.060.3
213116244200.050.4
223116244200.050.4
233116244100.050.3
243116244100.060.4
253116244100.040.3
263116244100.050.4
273116244100.050.3
283117244100.050.4
293117244100.050.3
303217244100.050.4
313217244100.050.4
MONTH31.016.523.8127901.7310.8





HDD = A Heating Degree Day represents the number of degree(s) that the mean temperature for the day is below 65 degrees during a day.

CDD = A Cooling Degree Day represents the number of degree(s) that the mean temperature for the day is above 65 degrees during a day.

SOURCE: NWS Chicago Normals (1981-2010) January ...
Normals for Chicago for Temperature, Precipitation and Snowfall (by month)

January Notes
Snow! Greatest potential for snow (as much as 20 inches can fall in a little more than 24 hours and greatest potential for the lowest temperatures of the year and all-time record lows. Snow cover can stay around for the entire month. Fog possible if a warm day occurs with snow on the ground. Days start getting longer around January 5, but nobody notices.

January 11-27 the normal low in Chicago hits and maintains the year's lowest normal temperature of 16 F. Mid-January is the coldest part of the winter in Chicago. Record highs in January are in the 50's and 60's F. Record low ranges -9 to -27 F.

CHICAGO O'HARE CURRENT AND HISTORY (3-DAY) ... | NWS Chicago Office OBSERVED WEATHER REPORTS

HOMETOWN WEATHER: Arlington Heights Weather Forecast -- Arlingtoncardinal.com/weather

LIVE RADAR | STORM TRACKS | CLOUDS INFRARED SAT | CLOUDS VISIBLE SAT (during daylight)

WunderMap® with Temperature/Wind Data || Google: O'Hare  Temps | NE Illinois Temps
Full Screen Motion Weather Radar (Wunderground.com) Midwest Cloud Cover and Arlington Heights Weather Forecast

SUNLIGHT DATA FOR SECURITY, TRAFFIC SAFETY, AND SPORTS
SunCalc.net data with azimuth & trajectory, times for dawn, sunrise, solar noon, sunset, dusk ...