340boy; Good morning to you sir, I've meant to say hello and welcome back before this and apologize for taking so long.
I believe that the statement made earlier in the thread is quite on the mark in that every 10 degrees drop makes a substantial difference to anything living/working in it - man or beast.
We're spoiled here in that the coldest I've seen it in the last 33 years was about -13°F, but it's funny that one gets acclimatized to it and now even 0°F feels really cold to me when I'm out working in it.
Anyway sir I really just wanted to wish you the best and say it's good to see you posting again.