I maintain a long enough long run to run a marathon without special training (16 miles) so my response might not be valid. I also have most of my weekly mileage in the long run.
When I have marathons spaced throughout the year, I will take three weeks of easy running after the first marathon. Then I will gradually start re-introducing my long runs from a base of 10 miles back up the the 18-20 range. I do a lot of cross training even during the marathon season, so I maintain that level during the recovery weeks. The idea is to stay fit, but not add too much stress to the muscles. It also depends on the time between the marathons. I will use a slow marathon as long run for another race and only take a week easy after wards.
As for the training in cold weather, just layer and watch for the ice. I've done runs in (-6) degrees, wearing a ton of clothes. I don't expect those long runs to be very fast becasue of the cold. You could also try a treadmill. I use a windtrainer for my bike and will ride for 2-3 hours, watching TV.
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