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December Weather in New Castle, United States

Last updated: June 24, 2025

In December, the average temperature in New Castle, United States hovers around 1°C (35°F), with a minimum dipping to -16°C (3°F) and a maximum reaching up to 17°C (63°F). This month also brings about 103 mm (4.0 in) of precipitation spread over approximately 11 days, contributing to a high average humidity of 86%.

December Temperature in New Castle

In December in New Castle, the average temperature is 1°C (35°F). Maximums can reach 17°C (63°F), and minimums can be as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.

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

The chart illustrates December 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, December typically has an average temperature of 1°C (35°F), with highs reaching up to 17°C (63°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec293339496169737166564135
Data source: Temperature data for New Castle generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in New Castle

In New Castle in December, the total precipitation amount is 103 mm (4.0 in), occurring over the course of 11 days.

December Precipitation Trends in New Castle

The chart displays monthly precipitation patterns in New Castle, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In New Castle, December typically receives around 103 mm (4.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9811110813914113814199115125103103
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in New Castle

In New Castle in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.

December Average Humidity in New Castle

This chart illustrates the average monthly humidity levels in New Castle, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in New Castle is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in New Castle

In New Castle in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in New Castle, you can visit Hourly UV Index in New Castle.

Maximum UV Index Levels in New Castle for December

The chart shows the monthly maximum UV Index (UVI) for New Castle in December, 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 December, the maximum UV index in New Castle typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: New Castle December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)98 mm (3.9 inches)88%moderate
February Weather0°C (33°F)111 mm (4.4 inches)88%moderate
March Weather4°C (40°F)108 mm (4.3 inches)87%high
April Weather10°C (50°F)139 mm (5.5 inches)87%very high
May Weather16°C (61°F)141 mm (5.6 inches)81%very high
June Weather20°C (69°F)138 mm (5.4 inches)83%very high
July Weather23°C (74°F)141 mm (5.5 inches)82%very high
August Weather22°C (72°F)99 mm (3.9 inches)76%very high
September Weather19°C (66°F)115 mm (4.5 inches)77%very high
October Weather13°C (56°F)125 mm (4.9 inches)82%high
November Weather5°C (41°F)103 mm (4.0 inches)89%moderate
December Weather1°C (35°F)103 mm (4.0 inches)86%low

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