The highest day temperature in January 2026 was 54°F. The lowest night temperature was -4°F. The average values for day and night temperatures during January were 33.7°F и 22.5°F respectivly.

The average sea surface temperature in January 2026 for New Castle was 33.9°F. The maximum and minimum values were 29.4°F and 36.6°F respectively.

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

Precipitation total in January for New Castle is 0.9 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 8.5 mph. It makes January one of the most windy months of the year for New Castle.

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 New Castle in January is 5.6 hours.