30 degree over night temp here in the panhandle of Texas.
At 720 am ,internal brisket food temp 170 f, somker temp 215f. Meat loaf stayed in all night,took just a little peak now and all looks great,good color,ect...total cooking time as of 720 am is 13 hours. pork butt cut in half on top shelf, side by side.A Brisket, cut in half on next 2 shelfs, meatloaf on bottom shelf in a stainless steel meatloaf basket ,an accessorie from brinkmann smoker catolog. And, the maverick temp probe sat right by my bed all night,which I pushed the backlight button to check temps several times during the night,a great little gadget.
Just do it! Smoke on!!