Depends on the job: When tree climbing, I try to avoid heavy rain, snow or wind. When in the bucket, wind is the main factor. When doing "regular" cutting, we try to get as much done as possible. We call it quits when we can't stand it anymore. Also depends on how urgent the job is. Once had to dismantle a few trees that were about to fall into a river: Heavy freezing rain, but if the trees weren't removed, they would fall in the river and flood the whole village. Told my crew we had to get the job done, no matter what, before we could get to shelter. 6 hours work in horrible conditions, frozen to death, but got it done. One of my guys started the job, until his fingers were too frozen to handle the ropes. I finished it off. Needless to say the customer was impressed and gave us good "rep". That's when you REALLY appreciate a warm coffee at the end of the day (In this case, we ended around 2PM).