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

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