I just thought you would like to hear about this.
I just bought a new outdoor light fixture today.
Something like this:
I just showed it to a good friend of mine and asked if I should install it today. The reply was: "No, wait for a warm day... like when it gets to -20C".
(It's -35C right now and with a windchill even colder.)
(That's colder than a snowbank!