They're probably just getting very dry. If you're like me, I'm usually sitting as near as endurable if it's cold. Plus air is more dry when it's cold.
I use regular saline solution like for contact lens wearers for my dry eyes. But sometimes I need to re-lube them (more as I've gotten older), and just a drop of olive oil on the lower lid and then kinda swished around get things back to right again.