January Weather in New Castle, United States

Last updated: June 24, 2025

In New Castle, United States, the average temperature in January hovers around -6°C (22°F), with extremes ranging from a frigid -25°C (-12°F) to a milder 9°C (48°F). Be prepared for about 55 mm (2.2 in) of precipitation spread over 10 days, contributing to an average humidity level of 90%. Stay warm and dry while exploring this chilly destination!

January Temperature in New Castle

In January in New Castle, the average temperature is -6°C (22°F). Maximum temperatures can reach 9°C (48°F), while minimums can drop as low as -25°C (-12°F). Travelers should prepare for cold temperatures and pack accordingly for extreme fluctuations.

January Weather in New Castle: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in New Castle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Castle, January typically has an average temperature of -6°C (22°F), with highs reaching up to 9°C (48°F) and lows dropping to around -25°C (-12°F).

Data source: Temperature data for New Castle generated using information from the Copernicus Climate Change Service.

January Precipitation in New Castle

In New Castle in January, the precipitation amount is 55 mm (2.2 in) spread over a duration of 10 days.

January Precipitation Trends in New Castle

The chart displays monthly precipitation patterns in New Castle, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In New Castle, January typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in New Castle

In New Castle in January, humidity is 90%. With an average temperature of -6°C (22°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm while navigating through the damp, frosty air.

January Average Humidity in New Castle

This chart illustrates the average monthly humidity levels in New Castle, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in New Castle is approximately 90%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in New Castle

In New Castle in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in New Castle for better planning.

Maximum UV Index Levels in New Castle for January

The chart shows the monthly maximum UV Index (UVI) for New Castle in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in New Castle typically reaches 4, which falls under the moderate exposure category.

Data source: New Castle January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in New Castle Compares to Other Months

Weather in New Castle varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in New Castle, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in New Castle, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	55 mm (2.2 inches)	90%	moderate
February Weather	-4°C (25°F)	73 mm (2.9 inches)	89%	high
March Weather	1°C (33°F)	61 mm (2.4 inches)	81%	very high
April Weather	4°C (39°F)	48 mm (1.9 inches)	74%	extreme
May Weather	10°C (50°F)	43 mm (1.7 inches)	58%	extreme
June Weather	17°C (63°F)	18 mm (0.7 inches)	47%	extreme
July Weather	21°C (70°F)	13 mm (0.5 inches)	39%	extreme
August Weather	20°C (68°F)	13 mm (0.5 inches)	39%	extreme
September Weather	16°C (60°F)	18 mm (0.7 inches)	53%	very high
October Weather	6°C (43°F)	60 mm (2.4 inches)	72%	high
November Weather	0°C (32°F)	39 mm (1.6 inches)	84%	moderate
December Weather	-6°C (22°F)	55 mm (2.2 inches)	90%	moderate