Well, no, your eye color will not be lighter in winter, for eye color can not change with seasons. Generally speaking, the eye color is hereditary and they are born with you. And they can be the same in most cases. But on the other hand, it can change with the emotion and weather. For example, if your emotion is low, the eye color can turn to light grey and light blue. Also, the weather has some influence on eye color too. In common, when it is really sunny outside, it can cause your eye color to become brighter. By the way, some drug which will have side effect that it can change the color of your eyes. but there are nothing to do with the season, such as winter or summer.