Well up there in the GWN in the maritimes you never really know what your going to get snow wise. Chains will help, if you get ice over snow or snow melting to ice then snow again,, your tractor weighs about 4000 pounds not a light weight and the blower most likely another 400, and I am making the assumption your tires are filled so you might be close to 5000 pounds. Like "fast" said hills slopes and ice make the difference. Chains aint cheap, and you dont say what you will be clearing ,flat, hills, paved lots, gravel road ways. These all figure into your question. Some guys like chains some dont. I used chains on the old ford, and the cub, but have not needed them on my little bouta, it dont mean I wont some day. The best I can say it to give it a try, be careful and think before you bust your arse or your arm,,,, don't ask,,lol,,, just take it slow and easy you will figure out if you need them.
Heres a link if you do deside you want/need chains the top 3 are good for your kinds of tires
http://www.tirechain.com/TractorChainmenu.htm