Here is a heads up... If you have not completed one of the Epohh research missions on New Romulus the winter Epohh missions will be greyed out and you will not be able to get a winter Epohh.
I have several alts that have not done the Romulan Epohh mission and I can verify this is the case. They have winter tags but the mission is grey to them. My alts that have received a normal Epohh can do the mission just fine.