I've had an 10# butt on my smoker since 9am. Fire has been from 225° to 250° It has stuck in the mid 130s° for about 2 hours. It just turned over to 140° because I've opened up the vents and allowed the fire to get to 280°-300°. The ambient temperature is about 30-40° cooler than when I've smoked butts before. I think I'm in the stall earlier due to the ambient temperature. Does this sound normal to you guys/galls?