Monthly Rainfall Becoming Less Extreme In South West
By Paul Homewood
Yesterday I looked at claims that “carbon emissions” had made the extreme rainfall seen during January 2014 in southern England more likely.
Today I am going to zoom in on the South West, where flooding was most acute.
We can see from the Met Office data below that it was indeed the wettest January on record since 1910, albeit only 4mm more than 1948.
But January is only month, and it is easy to cherry pick records for just one month, and in one particular region. Climatologically, such claims are meaningless.
If we want to detect trends in extreme rainfall, it makes much more sense to look at all of the traditionally wet months of the year, which in the South West’s case are October, November, December and January. In terms of averages, there is very little difference between the four.
If we analyse the wettest of these four months since 1910, we find a drastically different picture to the one painted by those who wish to persuade us that extreme rain is on the increase.
January 2014 received 250mm of rain, but this pales into insignificance against some earlier years, notably November 1929 (327 mm) and December 1934 (307 mm).
Again, notice the clustering.
Now maybe global warming can explain how Januaries are getting wetter, but Novembers and Decembers are going in the opposite direction. But I somehow doubt it.
What is clear, is that rainfall in the South West was far more extreme in the past.