RAIN RAIN RAIN, on 12 Jun 2009, 11:01 PM, said:
Amazing!
How much snow does somewhere like the summit of Ben Nevis receive each snow season?
The summit depth, typically, reaches its greatest depth in April, and has been as late as May in some colder years. Three metres or more of depth is standard. Of course, the summit area doesn't get anything like as much snow as the gullies on the north-east face, due to the snow blowing off the summit and settling below, so the actual depth on the top isn't an accurate reflection of how much snow has actually fallen.
As for how deep the snow can actually be in the gullies of Ben Nevis, it's a bit of an estimate. My own view is that Observatory Gully can exceed 20m in depth in some years. Consider
this picture of myself at Observatory Gully on the 23rd August 2008. Despite the warm and wet summer, the snow was still 9-10m deep.
When you look at the snow-pack in this condition, you can see the layers of snowfall in much the same way you can see the rings of a tree. Some layers are thin, indicating a minor snowfall, whilst some are feet deep, indicating a major fall. They are normally separated by a layer of dirt, making it easier to observe. Also, remember at that altitude (3700 ft), much of the precipitation is likely to fall as snow from around October (sometimes earlier) to May, fully 7 months of accumulation. That's a lot of snow!