The weather has turned cold in the end of November and colder than most years at this time. There has been a small amount of snow and the cold frames are closed with less than an inch of snow on top. I would not be surprised if it warms up again but December can go either way with warmer of colder weather. If it continues to snow it will be best to leave the cold frames closed, but if it warms up again the plants will be dryer if they are opened up to stay dry. Moisture will accumulate inside the cold frames when the weather gets warmer, and the cacti do better when it gets colder again if they stay dry.