Walnut Creek, CA to Spokane, WA

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Help!! We will be travelling from Australia to Walnut Creek in late February 2006.

We have hired a chevy express (12 seater) to drive from Walnut Creek to Spokane and i was wondering if there was anyone out there who could advise me of what the weather conditions tend to be like at that time of year.

Being from Oz we don't have a great deal of experience in driving in the snow but am hoping that if we stick to the main highways and allow 2-3 days of travelling we should be ok???

Would also appreciate any ideas on great little spots to stop on the way up!

If anyone has any advice/info for us we would love to hear it!

Thanks!