You obviously need to use a "guessing algorithm" that gives you the chances of snow on any particular day, depending on the minimum and maximum CET.
I think I assigned a maximum of less than 1°C a 100% chance that any precipitation would be of snow.
I'm not saying it's particularly accurate, but it does consistently apply the same algorithm to each day of each year.
Interestingly it did report 3 cms of snow last month on the 30th of November.
One thing that I did discover was an almost 60% reduction in the depth of annual accumulated snow since 1931.
This reduction compares quite well with the reduction in snowfall accumulations at Weston Park Museum in Sheffield since 1950.
There are two years 1988-89 and 2013-24 when it didn't generate any accumulations.
You can read my full report in more detail here.
Since I first published the article in May, a grand total of 25 people have viewed it, with your help maybe it'll go viral!
Very interesting. There's such a huge amount of scatter, that too much reliance should probably not be placed on the precise value of that trend line, but for recent decades it seems to bear out one's subjective experience.