With another blast of cold air set to hit the East Coast later this week and this weekend, we thought it'd be a good time to look back on the chilly temperatures across much of the Northeast and Midwest so far this winter and compare them to average. Taking average temperatures from both December and January, we calculated those readings compared to average readings. Here's what we found for several of the big cities in this part of the country:   On average, December was colder for most spots, and particularly in Boston, where the month of December was 4° degrees below average. A more typical January has even pushed average monthly temperatures narrowly above average in some spots, including Chicago and Burlington, but February looks poised to start on a chilly note. The cold weather, though, as promised, isn't done yet. Another shot of cold air returns later this week, plummeting temperatures well below average for this time of year...again. For the record, these cold temperatures aren't even close to cracking the coldest winters on record in any of these cities. It has, however, been colder than average, and it looks to stay that way. Stay with WeatherNation for the latest on the cold winter out East. For WeatherNation: Meteorologist Chris Bianchi