Storing your firewood outside is fine, who has room for an indoor log store anyway!? But there are a few guidelines to follow to make sure you're looking after your firewood properly.
First of all, make sure your firewood stack or log store is covered. Using plastic sheeting, tarpaulin, a basic roof to cover the top of the stack and a couple of feet each side is ideal. This will prevent water from accumulating on top of your stack. It doesn't need to be anything fancy or expensive!
Secondly, keep your firewood off the floor! Many people forget this step and although they cover the top of the pile, yet the rainwater, snow and moisture soaks in from the ground up. Keeping the log store on top of a couple of pallets is ideal. Pop a couple of bricks underneath the pallet at either side, job done! Raising your firewood will also help to eliminate insects and will help the air to flow, which brings us to our last point...
Allow the air to flow around your firewood. This will allow moisture out of the pile as it dries, speeding up the drying time, reducing the risk of mould and keeping your wood in tip top shape. If you are storing your wood in multiple rows, try and leave space between each row for the air to circulate all the way around if possible.