My JB lives on the covered front porch, so snow is not a problem. That said, I have a thermal cover and have happily Q'd at 10 below.
Yesterday, since the temp was 33 (WHOO HOO! Above freezing) I shoveled my way out to the far end of the patio so I could fire up my kamado and cook a New Year's Day turkey. Last year we had about 4 feet of snow and the kamado got no love all Winter so I felt compelled to give back this year with only about a foot and a half on the patio. A way to combine BBQ and cardio.
Wife said turkey from the JB is still her preference...