The highest day temperature in January 2025 was 54°F. The lowest night temperature was 31°F. The average values for day and night temperatures during January were 44.5°F и 42.0°F respectivly.

The average sea surface temperature in January 2025 for Plymouth was 50.8°F. The maximum and minimum values were 49.8°F and 52.2°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Plymouth is 3.1 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 15.6 mph. It makes January one of the most windy months of the year for Plymouth.

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 Plymouth in January is 3.5 hours.