ago (in Weather Magazine I think) there was an article about parameters for
accessing the quality of a summer:
rainfall, wind, maximum temperature, etc.
Some complex formula was given such as Tmax *3.2 + Sun hours *1.5 - Wind mean speed * 4.1 - Rain *7.3 (or whatever).
After comparisons of various
summers using these complicated formulae and ranking them, someone subsequently
wrote in and pointed out that almost exactly the same ranking was obtained by simply
using sunshine hours only.