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December Weather in Newcastle, United States

Last updated: June 24, 2025

In December, the average temperature in Newcastle, United States hovers around -3°C (27°F), with extremes ranging from a chilly -26°C (-14°F) to a surprisingly warm 21°C (70°F). Expect 24 mm (0.9 in) of precipitation over 5 days, accompanied by an average humidity level of 75%. Prepare accordingly for a month where weather can be quite unpredictable!

December Temperature in Newcastle

In December in Newcastle, the average temperature is -3°C (27°F), with maximums reaching 21°C (70°F) and minimums plummeting to as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures, from chilly days to surprisingly warm spells.

December Weather in Newcastle: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Newcastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newcastle, December typically has an average temperature of -3°C (27°F), with highs reaching up to 21°C (70°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec252237435468747163443627
Data source: Temperature data for Newcastle 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 Newcastle

In Newcastle in December, the precipitation amount is 24 mm (0.9 in) over the course of 5 days.

December Precipitation Trends in Newcastle

The chart displays monthly precipitation patterns in Newcastle, 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 Newcastle, December typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec152431466434473130401924
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Newcastle

In Newcastle in December, humidity is 75%. With an average temperature of -3°C (27°F), this humidity feels like a biting cold that seeps into your bones, making outdoor travel particularly challenging and requiring extra layers to stay comfortable.

December Average Humidity in Newcastle

This chart illustrates the average monthly humidity levels in Newcastle, 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 Newcastle is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%78%64%66%74%84%85%85%76%71%73%75%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Newcastle

In Newcastle 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 Newcastle, you can visit Hourly UV Index in Newcastle.

Maximum UV Index Levels in Newcastle for December

The chart shows the monthly maximum UV Index (UVI) for Newcastle 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 Newcastle typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3561091111108642
Data source: Newcastle 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 Newcastle Compares to Other Months

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

This table compares monthly weather conditions in Newcastle, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)15 mm (0.6 inches)73%moderate
February Weather-6°C (22°F)24 mm (1.0 inches)78%moderate
March Weather3°C (37°F)31 mm (1.2 inches)64%high
April Weather6°C (43°F)46 mm (1.8 inches)66%very high
May Weather12°C (54°F)63 mm (2.5 inches)74%very high
June Weather20°C (68°F)34 mm (1.3 inches)84%extreme
July Weather24°C (75°F)47 mm (1.8 inches)85%extreme
August Weather22°C (71°F)31 mm (1.2 inches)85%very high
September Weather17°C (63°F)30 mm (1.2 inches)76%very high
October Weather7°C (44°F)40 mm (1.6 inches)71%high
November Weather2°C (36°F)19 mm (0.8 inches)73%moderate
December Weather-3°C (27°F)24 mm (0.9 inches)75%low

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