If your roof can wait until spring then i would strongly encourage you to wait.
Replacing roof in winter.
Not only is it possible but in the right conditions it is preferable.
You nail shingles to the roof of course but each shingle has a tar strip on it that causes it to stick to the shingle that overlaps it.
This is the point at which risks continue to rise as the mercury falls.
I am not advocating for winter roof installation.
The answer is yes under certain circumstances.
Wearing a winter jacket pants boots hat etc can add another 15 pounds to your body weight.
If they do contact your roofing contractor right away.
For most roofers it is uncomfortable below freezing and impossible below 20 f.
Special materials for winter roof repair.
Be prepared to keep a close eye on the roof for the rest of the winter especially after heavy winds and make sure no blow offs have occurred.
Most roofers have to consider how not if they can perform a roofing job in winter weather.
This way you can ensure that your roof performs at peak condition at every season.
In addition it can also be a good time for a roofing company as winter is the down season.
Second the roofing crew uses many different tools.
If you need a new roof it is preferable for you as a home or business owner.
If you plan to replace shingles in the winter it can be done but you have to add something to bond the shingles together.
Because of the need to use your fingers precisely and bend your toes a contractor can only wear small gloves and boots.