Your camera might think the scene is too bright and darken it, making snow look gray. Dial in positive EC (+1.0 to +2.0) to keep the whites white.
On very bright days, even with a low ISO and fast shutter, your image may still be too bright. Use an (essentially sunglasses for your lens) to reduce the light reaching the sensor without changing your artistic settings. Tips for Professional Outdoor Video
If your camera supports them, enable Zebra stripes to highlight overexposed areas in real-time. Use Neutral Density (ND) Filters EC - Outdoor Exposure.mp4
If you prefer shooting in Manual (M) but want flexibility, set your ISO to Auto . You can then use the EC dial to adjust the brightness while keeping your shutter speed and aperture locked.
Your camera might try to brighten the shadows, making the image look "washed out." Dial in negative EC (-1.0 to -2.0) to keep the shadows deep and natural. Monitor Your Exposure Your camera might think the scene is too
Use the histogram on your screen to ensure your highlights aren't "clipping" (touching the far right edge), which means you're losing detail in the brightest areas.
In these modes, the camera calculates exposure automatically, and you use the EC dial to "nudge" it brighter or darker. Use an (essentially sunglasses for your lens) to
In digital video, it is often better to protect your highlights (like the sky) and lift the shadows later in editing, rather than blowing out the sky completely.