The highest day temperature in January 2025 was 46°F. The lowest night temperature was 16°F. The average values for day and night temperatures during January were 33.3°F и 29.1°F respectivly.

The average sea surface temperature in January 2025 for Charlestown was 41.1°F. The maximum and minimum values were 38.2°F and 45.2°F respectively.

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

Precipitation total in January for Charlestown is 1.3 in.

The average wind speed in January is 12.9 mph. It makes January one of the most windy months of the year for Charlestown.

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 Charlestown in January is 5.0 hours.