Brake rotors

GJC Posts: 198
edited January 2010 in MTB beginners
Hi all, i have purchased a trek ex 8 (09) bike three months back, i have been out riding several times throught the winter when i get time. I have noticed today that there is some rust appearing on both front and back rotors. Is this normal because of riding conditions (wet)? can i do anything to prevent getting worse?

Many thanks GJC
Lapierre Spicy 316 2011