Coldest Days Are Not as Cold
The polar vortex is once again causing many of us to reach for long underwear and heavy sweaters. But because the Arctic is warming nearly three times faster than the rest of the planet, the Arctic air advancing into the U.S. isn't as cold as it used to be.
Climate Central looked at the annual lowest temperatures at 244 locations across the U.S and found that 98% have recorded a rise of at least 1°F in their yearly coldest temperature since 1970.
The average trend across these cities is a 7°F rise, and 42 cities have recorded an increase of 10°F or more. And the warming trend is happening in cities across the country: Boise, Idaho (16°F) Albany, N.Y. (14°F), Minneapolis (12°F), Nashville, Tenn. (14°F), and Anchorage, Alaska (12°F).
Shorter winters can make fall last longer and spring start earlier meaning longer allergy seasons and extended seasons for ticks and mosquitoes.