It's -20 outside my window, and the radiators are barely warm.
Actually, it's -12 here, and the radiators are hot. I'm sitting in a t-shirt and shorts.
And here it's -20, and the radiator is so hot you could fry an egg on it.
And here it's -20, and the radiators are barely warm. I'm sitting in a t-shirt and shorts. Warming up from the computer.
-30, but the radiators are heating well.
-15, the windows are drafty, the radiators are heating okay, overall it's fine.
[insert any joke here]