You wouldn't find me there in February, in the snow. I doubt the path will be flattened by snowmobiles the way are walking and cross country skiing trailes are, and with the small number of pilgrims at that time of the year my guess is that you would find yourself deep in snow.
Mind you, many of the albergues are open year round... Perhaps you could contact a few of the year round hospies amd ask them about what you could expect.
The uphills would be bad enough with a lot of snow, but some of of the dowhills would be dangeous, such as heading down towards the dam in Grandas. Other spots uphill that could be tricky: the Acebo, then the double peak into O Cadavo... Dowhill from Hospital as your way to O Cadavo. And there is no way I would attempt the Hospitales route, even with company.
Then walking on the side of the roads which may be slippery and where you have practically no space to get away from incoming traffic....
I have friends who have climed Kili and did just fine following their guide, with the rest time to get used to altitude. Sounds far easier to me than trying real snow in the mountains of Northern Spain.