if you are going to live in the mountains you better start embracing the snow and cold... and 25 is not cold!
I've ran when.it's that cold. No fun. With the'mill I'm way more time efficient. Plenty of trail time once it warms up.
Simon Whitfield seems to do fine with his training shed. It was either Babbit or Brad Kearns who said Ken Glah used to spend all winter training in his basement on his treadmill, trainer and in his endless pool. He'd emerge in the spring time and decimate everyone in the early races such thar people didn't like competing against him in the early season. "Stationary training isn't sub-par, it's just boring."
i'm not saying it's subpar... but outside is WAY more fun and teaches you to suffer. with the right clothes the 20's is warm.
whitfield is a great indoor trainer and he was training for ITU... super fast, hard stuff.