Hello Kutscha:
I found an internet reference which indicates that, at least for a while, a dedicated winterised P 38 was supplied to the 11th Air Force in the Aleutians:
http://home.att.net/~jbaugher1/p38_18.html
In the Aleutians, the initial batch of P-38Es of the 54th Fighter Squadron were supplanted by a specially-winterized version of the Lightning, the P-38G-10-LO
Regards
Don W