I love bholler's take, "My experience is if you are trying to dry something keeping water off of it is a good idea." I couldn't agree more. I live in NH and don't really have a good sunny spot to season stuff. I scrounge all my wood and it's a mix of everything that grows around here and everything from fresh cut to dead for a couple of years. While sun greatly helps drying, so do those low humidity breezy days and that includes winter too. I stack in single rows 4' high with at least 3' between and I top cover with rubber roofing membrane. You can buy it online in 2' wide x 50' rolls. It's a bit of an investment but it lasts forever. Anything green (except pine, poplar and ash) I season at least 2 years. Really dense wood like red oak and black locust I season three. If I'm not sure, I season more. I don't worry so much about top covering green the first year because it is not going to get any wetter than it already is, just drier. From then on, I top cover trying to keep the ends as dry as possible to continue to promote moisture being pulled from deep within. You can think of wood as basically a series of tightly packed parallel straw like tubes that originally conducted water from the root systems to the leaves and visa versa. While there is some lateral movement of water in a tree trunk, it is very secondary to the up down movement. The majority of wood seasoning comes from the ends of your splits with the secondary lateral drying aiding that process. Unless your wood is beginning to decompose, the fact that it gets wet again on the outside doesn't restore water to the inside since it's really tough to force water back in those tiny little tubes. But any time the wood gets wet, it does slow the evaporation of water from the inside that was originally there from when the tree was alive. Basically anything that speeds the evaporation of water such as heat, wind, low humidity, helps season your wood. Humidity, still air, rain and cold, slow seasoning. And then if it's nicely seasoned but wet on the outside from rain or snow, of course you need to dry the outside again. Here's a picture of my seasoning situation. Would love to have a sunny field but I don't.
View attachment 239496 before it will burn well.