Normal High and Normal Low temperatures for the first day of each month, the 15th of each month, and the last day of each month.
January 1 – 32/17
January 15 – 31/16
January 31 – 32/17
February 1 – 32/17
February 15 – 35/20
February 28 – 40/24
February 29 – 40/24
March 1 – 40/25
March 15 – 46/29
March 31 – 53/34
April 1 – 53/34
April 15 – 59/39
April 30 – 65/44
May 1 – 65/44
May 15 – 70/48
May 31 – 75/53
June 1 – 75/53
June 15 – 80/58
June 30 – 84/62
July 1 – 84/63
July 15 – 85/64
July 31 – 83/64
August 1 – 83/64
August 15 – 82/63
August 31 – 80/61
September 1 – 80/60
September 15 – 75/55
September 30 – 69/48
October 1 – 68/48
October 15 – 63/43
October 31 – 57/39
November 1 – 56/38
November 15 – 49/33
November 30 – 40/26
December 1 – 40/26
December 15 – 35/21
December 31 – 32/17
SOURCE:weather.gov/lot/January_Normals_Chicago
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.
