Hi, Liz:

It's much harder to deal with the cold and snow when you're not set up for it.  I spent 3 weeks over Christmas in Dublin in 1980, and I found it very cold, as it was so damp (beautiful, but damp). 

My arena floor has 2 tons of hay salt worked into it, so it doesn't freeze significantly unless the temperatures drop to -25 or colder for at least a week.  Even then, we don't train, and as soon as the temperatures warm up to decent training levels the floor thaws out again and is quite rideable. 

We do have to "dress for success", which means many layers of gloves, shirts, vests, coats, socks, etc...I have Mountain Horse Ice High Rider winter boots, which are super to ride in and are really warm, and Kerrits Sit Tight "N" Warm insulated full seat breeches.  I wear a thin pair of silk gloves under my insulated leather winter riding gloves.  The horses wear quarter sheets.  All in all I'd say I resemble the Michelin Man most closely - or perhaps the Pillsbury Doughboy, but it does get the job done!  The horses do tend to be a little more "airborne" in the warmups in cold weather, making it a great time to school things like piaffe and passage, and we often get unplanned "airs above the ground" until they're really warm and working.