The highest day temperature in December 2025 was 53°F. The lowest night temperature was 14°F. The average values for day and night temperatures during December were 36.1°F и 26.7°F respectivly.

The average sea surface temperature in December 2025 for Newark was 41.9°F. The maximum and minimum values were 37.8°F and 48.4°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Newark is 1.3 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 8.3 mph. This value is relatively stable throughout the year.

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 Newark in December is 5.1 hours.