Flew window mission this morning all the way to the IP - before bad weather turned us back. The IP was inside the bomb line so we did not get credit for a mission. It was so cold we had to open windows for the pilot to see out. Inside the plane was -25 degrees C. Went to two classes in afternoon & was suppose to fly at night but a plane crashed on the runway & we couldn't take off. We are losing a plane a day average from the extremely bad conditions on this field breaking & cutting tires & landing gear. Take-offs & landings are more dangerous than being over Germany.