My web site has long had a Lincoln Highway weather map featuring conditions from 12 cities across the country. This morning, as I walked through 7° temperatures in PIttsburgh, I wondered about the rest of the country. As you can see, only San Franciscso can boast of warm temperatures (47°). The rest of the country is 25° or less, with 3 of the 12 cities below zero!
Wyoming DOT has a nice collection of web cams from I-80, which is often parallel to US 30/LH. The roads this morning look pretty clear in the east, but a few, like Evanston at 7 am (seen below), still look slippery: