Snow tire question

[Arian]

Hey guys,

I have a question... my front tires are worn out and I need to buy some new front tires soon.

Currently I am running, Michelin Latitude Tour HP (All Season Tire) on the front and the rear.

I want to start talking more trips to Tahoe and snowy climates, would you guys recommend putting Michelin Latitude X-Ice Xi2 (Winter Tire) on my fronts, and still have the Michelin Latitude Tour HP (All Season Tire) on the rear?

Also, does anyone know how the Michelin Latitude X-Ice Xi2 handle in non-winter conditions? I was thinking about keeping those tires on all year round, and eventually replace the rear with the Latitude...

So I guess I have two questions:

1. Would it be bad to have Winter Tires in the front while having all season tires in the rear?

2. Would it be bad to run Winter Tires all year long, even in the summer? If so, could you explain this to me?

My tires sizes are

Front: 275/40/20 -- E91/2J
Rear: 315/35/20 -- E101/2J