Fig. 7(a). Maps of `snowmelt week' of individual years, (a) 1975.
Black areas are always snow-covered, and grey areas are always snow-free in Weeks 8 - 30 of that year.
Fig. 7(b). Maps of `snowmelt week' of individual years, (b) 1987.
Black areas are always snow-covered, and grey areas are always snow-free in Weeks 8 - 30 of that year.
