I got 2 nucs back in October and have been mostly just feeding them to help them survive the winter. The last time that I opened the nuc was probably November time as the weather started to get really cold I didn't want to take the risk of opening it up. I regularly check to make sure they have enough fondant to feed off and when I check I can see down into the hive. I can't see much but I can see a good amount of bees but not as much as I think there should be. I'm just getting worried about them and I want to open it up and make sure they are doing fine. Would it be OK to open it up if I get a nice day out and check it or should I be safe and wait until springtime to check on them? Thanks