Hi,
Canvassing is best at the end of march when the clocks change,
People are feeliing better about themselves and obviously they arent as peeved when you are door knocking at 6pm in the light and not when its already been dark for 2hrs.
In general though, if you are in need of work then its winter time then waiting for the light nights just isnt practicable.
Therefore keep it to weekends or just go for it anytime.
What have you got to lose?
Dean