That chill in the air is the Arc Raiders Cold Snap event, now in full swing. Besides unleashing a blizzard on most of the maps and kickstarting two gameplay events, it's accompanied by a full update of tweaks, rebalances, and fixes to help improve your playing experience.
Immediate changes worth highlighting from the patch notes are the addition of a skill tree reset, the power to toggle aiming down your sights, Raider Tool customization, and spawn points on Stella Montis being moved to stop players being too close to each other. Of these, the ability to redo your skill tree in isolation is the biggest, as prior to now, you had to reset your Raider through an expedition.
