The weather looks to be good for the Classic so far this year. The race is through wilderness so there's no telling for sure what weather the racers are experiencing but here's a few webcams that could be similar.

This link is to a webcam at Black Rapids which is where the first checkpoint in the race is, about 50 miles into the race. Click on "All Sites" and then scroll down until you see "Black Rapids". http://akweathercams.faa.gov/viewsite.php


Here's a link to Cantwell weather which isn't too far from the finish.
http://www.wunderground.com/US/AK/Cantwell.html


At least one team was thinking about taking a route just south of the Central Alaska Range via glaciers. This webcam at Maclaren River isn't too far from their intended route.
http://www.maclarenlodge.com/webcam.htm