Wednesday, 11 February 2015

If 'climate' and 'weather' are the same, why would there be two words?

Lots of people discuss 'climate change'.

What does the word 'climate' mean?

Climate is 'an average over 3 decades'.

For example .... rainfall in Ireland.

So ..... 3 full, conventional decades......such as 1981 to 2010.

And another example - 'Average temperature 1951-1980'

The definition of 'climate' goes back at least 100 years.

If we are discussing climate change, that is what 'climate' means.

Climate change means change in the 30-year average.

Not over a week, or a season.

But in recent times, global temperatures have changed quickly.

So it can be useful to look at single decades.

Data from the World Meteorological Organisation.

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