I am in Nashville and have the same rig. Thanksgiving morning when I smoked my first turkey temps did not get above 42* and my little friend rolled along at 230* (dedicated probe for internal temp). The only temp drops where when adding more wood chunks, and when I inserted probes into bird. I did not have any wind, and that is my concern for the rest of our winter. I did use the water pan, this time I heated water on the stove in separate pot to a boil before adding to the smoker pan with my other aromatics.
Proof it happened, mix of apple and hickory for wood: