Chicago is world famous, its cold moist and colder. The week after Christmas is when Chicago is not very busy and hotels and airfares are usually at their lowest. But it can be damp and cold - 12 and 29°F (-11°C and -2°C) if you're lucky - or it will snow for days. Temperatures and brisk winds will guarantee that you'll spend most of your time indoors Chicago's activities and attractions will keep you busy at any time of year. If your main concern is good weather for touring the city, consider a visiting in spring or fall, when temperatures make it a pleasure to be out. The city comes alive in fall as stores dress up for the holiday season along the Magnificent Mile and State Street. Summertime brings opportunities for outdoor activities, temperatures get around 90 °F in hot spells, and the humidity can be uncomfortably high. This is festival season, with events taking place in the parks and neighborhoods every weekend. September with its warm days is probably the bets month of the year, weather-wise, Fall and Spring offer a mix of seasons just depending on how Chicago feels