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December Weather in Smithfield, United States

Last updated: June 24, 2025

In Smithfield, United States, the average temperature in December is a brisk -5°C (23°F). During this time, you can expect minimum temperatures dropping to -21°C (-6°F) and occasional highs reaching up to 10°C (51°F). Prepare for about 60 mm (2.3 in) of precipitation spread over 10 days, while the average humidity hovers around a significant 88%. Stay warm and dry!

December Temperature in Smithfield

In December in Smithfield, the average temperature is -5°C (23°F), with maximums potentially reaching 10°C (51°F) and minimums plummeting to as low as -21°C (-6°F). Travelers should be prepared for cold weather conditions and dress appropriately for outdoor activities.

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

The chart illustrates December temperature patterns in Smithfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Smithfield, December typically has an average temperature of -5°C (23°F), with highs reaching up to 10°C (51°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec232534404963716959433323
Data source: Temperature data for Smithfield 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 Smithfield

In Smithfield in December, the precipitation amount is 60 mm (2.3 in) over a span of 10 days.

December Precipitation Trends in Smithfield

The chart displays monthly precipitation patterns in Smithfield, 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 Smithfield, December typically receives around 60 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec688664786728222735465660
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Smithfield

In Smithfield in December humidity is 88%. With an average temperature of -5°C (23°F), this humidity feels like an icy blanket enveloping you, making travel uncomfortable as the cold damp air seeps through layers of clothing, chilling you to the bone.

December Average Humidity in Smithfield

This chart illustrates the average monthly humidity levels in Smithfield, 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 Smithfield is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%84%75%62%56%44%37%46%67%84%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Smithfield

In Smithfield in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Smithfield, you can check the information here.

Maximum UV Index Levels in Smithfield for December

The chart shows the monthly maximum UV Index (UVI) for Smithfield 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 Smithfield typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35810111211119653
Data source: Smithfield 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 Smithfield Compares to Other Months

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

This table compares monthly weather conditions in Smithfield, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)67 mm (2.7 inches)91%moderate
February Weather-4°C (26°F)86 mm (3.4 inches)92%moderate
March Weather1°C (35°F)64 mm (2.5 inches)84%very high
April Weather5°C (40°F)78 mm (3.1 inches)74%very high
May Weather10°C (50°F)67 mm (2.7 inches)62%extreme
June Weather17°C (63°F)28 mm (1.1 inches)56%extreme
July Weather22°C (71°F)22 mm (0.9 inches)44%extreme
August Weather20°C (69°F)27 mm (1.1 inches)37%extreme
September Weather15°C (59°F)35 mm (1.4 inches)46%very high
October Weather6°C (43°F)46 mm (1.8 inches)67%high
November Weather1°C (33°F)56 mm (2.2 inches)84%moderate
December Weather-5°C (23°F)60 mm (2.3 inches)88%moderate

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