More often than not (with certain exceptions) I use the default exposure settings on my dash cams. But what works for me in my circumstances may not work for you in yours. The best thing to do is experiment and see what works best for you. If you want to brighten up the scene try increasing the exposure one "click" on the menu and see what results you get. You can always change the settings back to the defaults or try further experimentation.
Actually, rather than do that, for now I would suggest tilting the lens downwards one click so that you have less sky and more of your hood in the image. That alone may resolve your issue with a darker looking image than you prefer in these snowy conditions because having more of the darker hood on your vehicle within the FOV will force the camera to compensate by automatically increasing the exposure slightly. The general rule of thumb with dash cams is 60/40, in other words 60% sky above the horizon and 40% below the horizon (or vice versa if that works best for you). Depending on your vehicle (hood length/color) or usual driving conditions (tree lined roads vs open highway) even 50/50 may be optimal. Too much sky is always problematic.
I happen to live in a snowy climate too (Vermont), although we rarely, if ever get THAT much snow I know what it is like to drive around in crazy bright sunny conditions after a big snow storm and it can be a challenge for many dash cams. Keep in mind that these extreme bright exposure conditions you are currently driving in won't always be manifesting. Still, I think your camera is doing a remarkable job with exposure in such bright white surroundings. Many other dash cams on the market struggle under similar circumstances and the snow would be all blown out with no detail at all.
