2015–16 North American winter
The 2015–16 North American winter was not as frigid across North America and the United States (especially the East Coast) as compared to the 2013–14 and 2014–15 winters. This was mainly due to a strong El Niño, which caused generally warmer-than-average conditions.
Source: Wikipedia — 2015–16 North American winter (CC BY-SA 4.0)