There are those who regard backyard grilling in winter weather as a kind of performance art.
But it's not all just for show. Certain entrees simply taste better when cooked outdoors.
This probably does not qualify as a "Spokane thing." I'm sure there are those elsewhere who cook in the backyard in January.
But I have not noticed the telltale aroma of outdoor grilling lately. So I wonder if it actually is going on in other neighborhoods.