Annals of Global Warming: Octobers in the U.S. are 2°F warmer


Octobers are warming across the U.S. with the increasing accumulation of greenhouse gases in the atmosphere. Since 1970, October temperatures have risen about 2°F. Warming throughout the fall is even stronger in some parts of the country, with the Northeast and the West warming the most. This warming can delay the start of some of the traditional cold season activities in cooler and mountainous climates, such as skiing. The warming trend also means first freezes occur later in the year, which can allow more insects to survive later into the year and make for a longer fall allergy season.

From Climate Central: Octobers are warming across the U.S. with the increasing accumulation of greenhouse gases in the atmosphere. Since 1970, October temperatures have risen about 2°F. Warming throughout the fall is even stronger in some parts of the country, with the Northeast and the West warming the most. This warming can delay the start of some of the traditional cold season activities in cooler and mountainous climates, such as skiing. The warming trend also means first freezes occur later in the year, which can allow more insects to survive later into the year and make for a longer fall allergy season.

Since 1970, Octobers are 2 degrees warmer? No big deal?

See the caption. A lousy 2 degrees is a lot. It’s enough to:

  • Reduce the number of freezing days, allowing pine bark beetles in Colorado to escape death by freezing, and thereby kill more pine trees, faster.
  • Change October precipitation from snow, to rain. Rain instead of snow may cause regional flooding due to the rapid water dump; it may reduce snowpacks that provide water through the warmer months, effectively adding to drought threat.
  • Keep some prairie flowers alive longer, delaying migration of butterflies triggered by reduced food supply; ultimately this could cause butterflies and other migrating beneficial insects to migrate too late in the year.

No big deal, unless you live on Earth.

“What did you do when you learned CO2 was hurting the planet, Grandfather?” our grandchildren will well ask. Got an answer?

Shake of the old scrub brush to Climate Central’s Twittering, with a clever .gif.

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