C-c-c-c-old?
Firstly, I'm not a pro like many of you guys -- as in pro-arborists. I grow them mostly for some of you guys to plant.
I do however have winter work on the tree farm, and I heat my house with wood:
1. The tractor is a Deutz 6250 with a 3 cylinder air cooled diesel. Below -10C (about +10F) it doesn't start worth a *@(#*.
2. The chainsaw works at all almost all temps. Some days I just cut and stack wood, waiting for a warmer day to hall it to the barn.
3. Poplar splits wonderfully at -20 C (-5F) I only rent a splitter when I've got a days worth to do, which means once every 3-4 years. I split most of my 8 cords of firewood by hand. Frankly, most of it splits faster by hand than I can with a splitter, and I don't have a noisy bashine next to me.
At the other end:
I don't like planting trees above 25C (75F) Roots dry, and there's more transplant shock.
And I hate working in the rain. In Alberta, there seems to be a requirement to use pre-chilled water for rain.
I prefer not to work in my woods when the wind is blowing mroe than about 50 kph (30 mph) We've had 3 30" black poplars come down at various times. I'd rather take them down when I'm not distracted by all the other wind noise.