Combination of year-round and seasonal produce. Simple guide to follow: Separated by color, eat one color a day, 3 green. Yellow also includes white or brown produce. This list includes fresh fruits, vegetables, herbs.

While not a complete list of all winter fruits and vegetables, since different regions have access to different produce, these are the plants I have the most access to in Southern California during the winter season. 

A serving size is generally the whole fruit or vegetable if you can fit it in the palm of your hand, otherwise serve yourself up roughly the size of the palm of your hand as a single serving size. Stop worrying about calories. Just eat whole foods.