Same type climate issues here. I fired mine up two weeks ago when it got down to 38 F one night. Then the temps went right back up again and couldn't use the A/C because the OWB was running. It has been running now for almost two weeks and I've only loaded it 3 times. I have a good amount of Poplar and soft maple that didn't get used last year so it's nice a dry, but not my "good hardwood" that I use when it gets really cold.
Just getting it going with a little pallet wood and soft maple. And just for you guys with the 20/20 wood I.D. vision, yes there are a couple of really dry pieces of oak in there to help the fire start nice and slow and last. I always build really small fires and ramp them up when all of the burn barrel has had a chance to warm up. Now...bring on the snow!