I've worked in about -9 celsius and I hope to god I never have to again too
-9 Ian!
You sent me out at 6.30am in colder than that.
I think when I went out it was about -10 or 11, but it had been down to -13 or so.
I guess this was about 7 years ago.
As soon as the washer touched the glass it froze, as shops don't have their heating on before they open.
It was impossible until they opened and it warmed up.
No problem with domestics, but you can't do sills.
Rog.