I did two hours on a trainer inside, the temperature was fine. It was hard work though.
It's just silly going out at 6:00am or earlier in the freezing cold, it's just not worth it. I'm being super careful ahead of going overseas in trying to avoid getting sick.
I can only do about half an hour on the trainer before I start thinking of burning the trainer
With the right gear its not too bad, just get the ears, fingers and toes sorted and its mostly bearable