CTA serve buses (Routes 1- 208) and Elevated/subway trains in the entire Chicago city and 40 nearby suburbs. Most of the bus and rail routes are served up to late evening with frequency of 5 -15 minutes.

PACE runs buses through the suburbs with bus route 208 and above with maximum routes connecting to CTA up to evening with a frequency of 30-40 minutes.

METRA runs sub urban trains from several Chicago downtown terminals with off peak frequency of 1-2 hors and peak frequency of 20-30 minutes with most routes running daily.

The winters in Chicago are quite variable and mild on most days, but the city can experience frequent bouts of severe cold. The average snow during the winters results in about 38 inches of snow. But, it can snow up to 89 to 90 inches on certain days. This city has seen the winters bring in severe storms, though a rarity.

The average temperature during the month of January is about 29 degrees Fahrenheit. But, unpredictable that the weather in this city is, the winter temperatures have known to fall below 0 degree Fahrenheit as well as risen over fifty degrees Fahrenheit.

http://chicago.nyctourist.com/chicago-weather.php

http://weather.yahoo.com/united-states/illinois/chicago-2379574/