That depends on where you live and how oily you are.  If your weather really doesn't change much with the seasons, than probably not.  On the otherhand, if you have dryer skin and live in a climate that's cold, you'll need a heavier moisturizer and to apply it more often.  If you have oily skin, you might be fine in the winter but need to change to something very light or none at all for a hot, humid climate.   Some people do fine with just a sunscreen in a moisturizing base.  Hope that makes sense.  Don't forget your body too!    Dr. I