You can get some great work from canvassing in the winter the only proviso is from December you may get the Christmas clean only brigade. But normally you can get the same hit rate now as in spring or summer. You may even feel you hit the jackpot on Saturdays or Sunday's with a bright sunny day!
The low sun shows up how bad the windows are, either they are not being done or just badly done, And around here a large number of windys hibernate through the winter
Darran