I have just realized/noted/found out that today is not only Robbie Burns day, but it is also the traditional day to celebrate the conversion of St. Paul. For quite a while, St. Paul's Day was supposed to be a 'groundhog day' sort of thing, which forecast the upcoming year on the basis of the weather ... so here's something you can assign your Latin students to work out (a bit of medieval verse associated with the day) ... shouldn't be too difficult:

Clara dies Pauli bona tempera denotat anni;
Si nix vel pluvia, designat tempera cara;
Si fiant nebulae, pereunt animalia quaeque;
Si fiant venti, designat praelia genti.'

... this is the version from Chambers Book of Days ... glossing tempera as tempora and praelia as proelia might help.