Absolutely JerseyHunter, When using the smoker outside in an unprotected area, the outside temperature, sun, wind, rain and snow will have a significant effect on the temperature inside. I do have an insulated jacket that I put round my big smoker during the winter which helps but it still is not as stable as smoking on a still, warm day. To minimise the effect try to put your smoker in a position that is sheltered from the wind. On hot sunny days (not an issue now I know) then use it under an awning or roof shelter to mininise the effects of fluctuating direct sunlight.
Also take into consideration the time of year this is. It will be getting colder and the wind will be a blowing so if your smokers is not in a garage or shed you should think of some sort of wind block to keep temps from fluctuating. Good luck and enjoy.
As you get to use your smoker you will quickly pick up on the things that influence it the most in your garden.