Today will be likely be more than a dozen degrees warmer than the normal temperature for December 4th, as warm air continues to be advected from the south ahead of an approaching cold front.
Yesterday’s high temperature of 59°F was quite a bit higher than the normal Dec. 3 value of 46°F, and the unseasonably pleasant weather is expected to continue today. The high temperature record is not in danger, however, as it got up to 70°F in Boston on Dec. 4, 1982.
In any event, the aforementioned cold front will bring an end to our warm spell tomorrow. While temperatures will remain in the 50s °F early in the day tomorrow, the frontal passage will bring morning rain showers, followed by gusty winds and plunging temperatures in the afternoon. Temperatures will have a good chance of dipping below freezing tomorrow night before returning to more seasonable values for the rest of the week.