It's been two years since I updated this chart. It shows total hours at each below zero level from last winter (2021-2022) back to the winter of 1976-1977.
Here are some take home points:
* No -20 wind chill since early 2019
* Coldest winter (wind chill) in recent memory was 2013-14. Also the last time we had a long duration period with wind chills under -30
* Winter of 1992-1993 was the only one without a wind chill below zero. 1997-98 was close.
* Some notable winters (total hours below zero):
2018-19: 669
2017-18: 842
2008-09: 772
1996-97: 1022
1993-94: 1605
1989-90: 1089
1983-84: 1958
1976-77: 2125
