Tire Pressure: What to run, where to run it?

[Chi_San]

So, I do mixed driving. Dry pavement, wet pavement, ice, snow, offroad on gravel, offroad on dirt, offroad on rocky hellscapes.

The only surface I don't drive on is sand. (Cough. Anymore. Cough.)

So, I know that for best traction on wet pavement, using either summer tires, all season tires, or snow tires, higher, but still reasonable, tire pressure is ideal for grip.

I also know that when driving on loose surfaces, sad, dirt, or gravel, lower, but still reasonable, tire pressure is best.

And for driving on rough surfaces (the rocky hellscape), higher tire pressure is ideal, since you can wreck tires with low tire pressure (unless they're meant for this).

So, what about snow and ice? I've never seen anything detailing tire pressure for snow and ice driving... I usually just leave my tire pressure on the 'high' side, and normally don't have issues, but I'm wondering if this is ideal.