Sounds like you guys had a great antelope hunt.
Anytime you are seeing big bucks at close range that is good stuff.

The cold weather will increase the energy level of the bulls a lot.
They will be bugling more and active longer into the day. Although they are likely to answer your bugles at any time during the day anyway.

The thing I always like best about the colder weather is that it increases my own energy level. It is much easier to climb the mtns all day at 30 or 40 degrees than it is at 70 degrees. Also if you get a bull it is a much better condition to take care of the meat when it is cold like this.

With the cold weather this year this is shaping up to be one of the better elk bow seasons in recent years.
Good luck on your hunt!