I have not been able to find that info yet. So I don't have anything to compare the LHC temperature with and Van Rijn will have a field day ripping me for this, but here goes.
LHC TEMPERATURE
EQUIVALENT
1 billionth of second after Big Bang
100000 times temperature of sun
http://atlas.ch/news/by_the_numbers.html
They don't say it's the same temperature of a cosmic ray collision, but they don't say it's not the same temperature. Hope that save's Vin Rijn a post.
I personally infer from that with my shaky logic that the collision area of the ATLAS chamber will be at that temperature during the collisions.