Hmmm... Thank you, @Stormkeep . I have moved Clement Frost (Santa) into the household who bought and tested the build/retail store. I actually have an apartment in the basement of the store where he is living. His handiness is 10, and he can use the weather changing station to make it snow (I used this during testing and the screenshot I mentioned). That works fine and is fun since the customers show up in winter clothes to shop even in summer, etc., but the snow only falls and does not accumulate on the ground. It apparently only changes weather, not the season. Even if I have him make a blizzard it does not accumulate on the ground. I didn't have him upgrade the machine yet, but I just had a look at the upgrades and none of them is apparently for changing the season or anything similar.
I did have testing cheats enabled when I tried the season changing cheat.
Unfortunately I don't use any mods or CC. Worried about the occasional 'gumming things up', and since I build and upload to the gallery I don't want to mess up things for others who download my builds. If that wasn't the case I would consider a mod...