91 Buick Century shifting problem in snowy weather. Have only noticed it then

Hello, I am wondering if what you are experiencing is related to internal concerns with the transmission associated with spinning wheels in snowy conditions. As a stand alone situation, nothing specific comes to mind regarding snowy weather and not shifting. You may want to have the vehicle checked to ensure the shifter linkage is engaging the proper 'drive' selection instead of "low" or just first gear. Also ensure your fluid is clean and full.

Observe speedometer when this occurs - an increase in mph will be a telltale the wheels are spinning..