the thing that gets me everytime about this is this question right here. What the hell does "average global temperature" even mean?
how many points around the globe are you taking temperatures at?
at what elevation are you taking these temperatures?
Are the points you're taking these readings from out in the open air and free from shade all day from objects like buildings and trees?
How long are you gathering data for, and how often are you capturing the data over that time period?
If you're taking ocean temps, at what depth are you going?
There are so many variable that go into this "average global temperature" it's difficult to really believe anyone that publishes data, and even more difficult to compare publications b/c i'm sure not everyone is comparing apples to apples.

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Posted by Bmath

Member since Aug 2010

18692 posts

Posted on 3/30/17 at 3:06 pm to TeddyPadillac

quote:
how many points around the globe are you taking temperatures at?
at what elevation are you taking these temperatures?
Are the points you're taking these readings from out in the open air and free from shade all day from objects like buildings and trees?
How long are you gathering data for, and how often are you capturing the data over that time period?

It's typically done with data loggers that continuously take readings. Elevation is dependent upon location. However, some studies only look at mean sea surface temperatures as this takes elevation and shade out of the question. These data can also be grabbed with satellites.

You look at how climate is changing across the whole globe because sometimes weather patterns in one area can create a false positive due to a localized climate event. For example, The Little Ice Age is often cited by "climate change deniers" as proof that the earth was just very recently cooling. However, this event was found to only impact Europe.

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