Thanks for the reply’s
The comments confirm my expectations about snow in mountain valleys, like ‘Georgetown’.
What Mike wrote appears to be true when you look via ‘Google’ (free version) but I need to look deeper as my modelling period will be between 1950 and 1975.
Mark … ‘a grump’ … must be a nice grump, very useful web-sites, and done for all to read.
Thanks fellows
Robert Dall