I am looking to find the famous strip weher Linus comes across 史努比 freezing, and 评论 "Be of good cheer, Snoopy" (or something like that. Can anybody help?

I don't know where 你 can find that exact comic, but if 你 know what 年 it was in, it will be easy to find on Comics.com
Even if 你 don't know the year, 你 can still 搜索 for it. Here's the link: link The website reposts all the old comics, one per day. There's a 搜索 bar where 你 can put in the year, 日 and 月 to look for the comic. Good luck, I hope this helps.