A post by Paul Homewood expressed surprise at comment by Philip Eden in his Sunday Telegraph newspaper column about August rainfall. Eden missed a trick, reality is more interesting. I’m responding here with a lengthy item.
How rainfall varies over the year by area for a few regional datasets. Includes data from 1770 to date. (data is provided if the details matter)
Eden is I think pushing reality in finding subset areas where August is the wettest month. Read Paul’s article here.
As I read it autumn storms originate in the tropical Atlantic bringing water which has infamy[*]. As the Atlantic cools there are fewer storms and colder air. As the year progresses into what passes as summer airflow may bring warm wet air from the south, continental Europe drying out, more infamy. We have an Indian summer lull, the Atlantic calls.
Here we can see August (8) is the most variable month.
The annual data comes from the standardisation works the author has automated. Part of this removes the annual variation, this signal being saved to disk file so producing this derivative work is a few lines of code and then process. Standardise and plot.
CSV file of the annuals and ODS spreadsheet post processing here (70kB)
Post by Tim