This year's El Nino in the Pacific Ocean is indirectly prompting a high pressure cell over Bermuda to pump hot tropical air northward. Florida to Quebec will see a heat wave. Many cities, such as Buffalo and Boston, will break their record high for Dec. 24 at midnight, and the temp will then rise through the day – yeah, the day's low will be higher than the record high. The interior of Quebec could see temps over 40F above normal.
2015 will be the warmest on record globally by a wide margin.