This Halloween is shaping up to be one of the coldest in recent memory, particularly for those in the northern states. As trick-or-treaters prepare to don their costumes and venture out into the night, they may be met with a significant chill in the air. Forecasters are predicting the possibility of frost in many areas, and even flurries of snow could make an appearance, adding an unexpected wintry touch to the spooky festivities.