The highest day temperature in December 2025 was 55°F. The lowest night temperature was 16°F. The average values for day and night temperatures during December were 37.5°F и 31.7°F respectivly.

The average sea surface temperature in December 2025 for Montauk was 45.6°F. The maximum and minimum values were 40.8°F and 50.8°F respectively.

Most of the days in December are sunny but you can also expect cloudy and gloomy days.

Precipitation total in December for Montauk is 1.3 in. This value is relatively stable throughout the year.

The average wind speed in December is 14.3 mph. It makes December the most windy month of the year for Montauk.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Montauk in December is 5.2 hours.