I'll probably fish Comet Pond this weekend, if it isn't covered with ice (a distinct possibility, many Worc. ponds have a good coating).
If it is covered, I'll have to wait until it really hardens up, then tippet size won't matter. FWIW, I'll use a tippet in the 4-6 pound range. BTW, remember that the cold makes tippet material stronger.