In winter the sun doesn’t get as high in the sky, so you can get long shadows all day. The shadows are softer and have a moist feel to them, especially in the morning when there is dew all over the ground. You can take photos at any time of the day, it is the best time of the year to photograph.
Frosts and fogs can give the landscape a completely different look, and heading out on a foggy morning can be well worth it. It is cold, but the images will make you glad you went. If you know it is going to be foggy or frosty in the morning you need to just head out, as you may not get many mornings with either of those conditions. If you stay out long enough you might also be rewarded with an amazing sunny afternoon.
Stormy skies and rain can give another dimension to your images. Large storm clouds or grey skies can give a landscape a completely different look compared to those with blue skies. Look for cloudy skies, and breaks in the sun, to give the scene in front of you a great effect.
Winter often means bare trees. Once the leaves have been stripped from them, there are branches that can give your images interesting shapes and shadows. If you like photos with lots of mood, it is a perfect time to get that, especially if you get a great fog to go with the bare trees.