As CO2 Has Increased, Hot Days In The Midwest Have Decreased

Below 320 PPM CO2, 100 degree temperatures in the US Midwest were common – but they rarely happen any more.

ScreenHunter_457 Jun. 13 23.41

About Tony Heller

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6 Responses to As CO2 Has Increased, Hot Days In The Midwest Have Decreased

  1. daveburton says:

    “The Midwest” is a rather large place. Parts of it see lots of 100°F days, parts never see 100°F days,

    I think that in parts of the Midwest, e.g., much of Illinois, increased agricultural irrigation has increased average summer humidity, which moderates temperatures and reduces daytime highs.

    I doubt that CO2 has had much to do with it, though it might have a small effect. It seems plausible that CO2 could contribute slightly to increased average summer humidity, because higher CO2 levels produce bigger, healthier plants, and bigger plants put more H2O into the atmosphere through transpiration.

  2. Send Al to the Pole says:

    That’s perfectly consistent with CAGW!
    …..because it isn’t happening….
    ….. because the dingo ate the global warming. Because Science!

  3. David says:

    I can tell you…here in Santa Fe, NM temps. dropped 10 degrees in a yr.here. Last yr. today it was 93…today it was 83…

  4. stpaulchuck says:

    take a look at the NASA SABER Project results. It would appear that CO2 actually protects us from solar long wave heating. So then, more CO2 in the atmosphere, more protection from (direct) solar heating.

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