This is my jacket that I wear all winter. Lightweight fleece, doesn't really stop stronger wind and I rarely zip it up (if its windy I will).
I also wear shorts all winter. Cold doesn't phase me much unless there's a wind chill under 15 or its under 5 degrees normally. I only use the coat if its under 40 degrees or so (otherwise its lightweight T-shirt)... But until it gets under 32 degrees, I just roll up the sleeves
I live near Chicago, so its funny to watch people all bundled up while I have my jacket sleeves rolled up and unzipped.