That shot of trees covered with snow takes a couple of weather factors, the first is water. It’s the snow with a lot of moisture content that tends to cling onto trees limbs as it falls. The wetter the better but then the key is cold. But if you have cold when the snow is falling, it’s not wet. That’s why often you’ll see the snow cling and then your won’t as once warmth hits, it drops off from its weight (pine boughs are adapted just for this). The moral of the story, you want the photo of the snow covered tress, or this case, a rock in a creek, shoot it ASAP, don’t come back to get it later. It will be gone!