On Fri, 07 Dec 2012 19:12:57 -0700, Tony Hwang
wrote:

Hmmm,
My next door neighbor had reroofing job done in the snow with temp. of
10 deg. or so below freezing. Wondering if that was a good idea? I
noticed work crew was Mexican family including woman.

I asked my roofer about 2 years this question and they told me until
freezing. If I recall, it had to do with slipping off the roof.