A 21st-century novelty: Record November cold in the Northeast - Jeff Masters

https://www.wunderground.com/cat6/96l-southwest-azores-may-become-subtropical-storm-sean

A fast-moving shot of unusually cold mid-autumn weather left dozens of daily record lows in its wake from the Upper Midwest to New England. Readings in the single digits (°F) were notched as far south as the regularly coldest parts of southwest Pennsylvania, as reported by weather.com. The region was moderating on Monday, but a more prolonged bout of cold may strike the northeast half of the nation next weekend into Thanksgiving week.

Among the daily record lows set on Saturday:

Boston, MA: 23°F (old record 24°F in 1901)
Morrisville, VT: 14°F (old record 16°F in 1999)
New York (Central Park), NY: 24°F (old record 28°F in 1933)
Bradford, PA: 5°F (old record 10°F in 1957)
Youngstown, OH: 14°F (old record 21°F in 1957)
Atlantic City, NJ: 21°F (old record 22°F in 1974)
Wilmington, DE: 20°F (old record 22°F in 1961)

These records become more noteworthy in the context of a climate being warmed by human-produced greenhouse gases. In the nation’s biggest cities, growing urban heat islands are also helping to keep nights warmer, making it tougher still to hit record lows. In Boston, the lows of 24°F on Friday and 23°F on Saturday are the only daily record lows the city has managed to set since 2000 during the entire three calendar months of October, November, and December. In those same three months, Boston has seen at least 11 daily record highs since 2000. Likewise, the 25°F on Friday and 24°F on Saturday in New York’s Central Park are the only record lows on the books since 2000 in Oct./Nov./Dec., whereas the park has seen 19 record highs since 2000 during those three calendar months.

For sheer misery, it would be hard to top the conditions that accompanied the cold blast at Mount Washington, New Hampshire, where winds topped out at 105 mph on Friday. Observer Tom Padham braved the fierceness in a video shot on Friday morning with a temperature of –2°F and a wind chill of around -40°F.