Cold Celerity

You are a child of the frozen north, and you draw strength from the biting cold and unforgiving conditions.

Prerequisite: Endurance.

Benefit: When you are in conditions of severe cold (below 0° F), you gain a +2 bonus on initiative checks and a +1 bonus on attack rolls. In addition, you gain the bonus on attack rolls for 1 round after any round in which you take cold damage.

Source: Adventurer's Guide