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December Weather in Smithfield, United States

Last updated: June 24, 2025

In December, the average temperature in Smithfield, United States hovers around 3°C (37°F). Expect a chill, with minimums dipping to -17°C (3°F), while maximums can reach a pleasant 19°C (66°F). This month sees 126 mm (4.9 in) of precipitation spread across 14 days, and with an average humidity of 85%, be prepared for some damp conditions!

December Temperature in Smithfield

In December in Smithfield, the average temperature is 3°C (37°F). Maximums can reach 19°C (66°F), while minimums can drop as low as -17°C (3°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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 3°C (37°F), with highs reaching up to 19°C (66°F) and lows dropping to around -17°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec323742526269747267574337
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 126 mm (4.9 in) distributed over 14 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 126 mm (4.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec881371161341441511149410711586126
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 85%. With an average temperature of 3°C (37°F), this humidity feels like a chilling blanket enveloping you, making traveling uncomfortable as your clothes cling to your skin and the cold air bites at your face.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
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 Weather0°C (32°F)88 mm (3.5 inches)86%moderate
February Weather3°C (37°F)137 mm (5.4 inches)86%moderate
March Weather6°C (43°F)116 mm (4.6 inches)86%high
April Weather11°C (52°F)134 mm (5.3 inches)84%very high
May Weather17°C (62°F)144 mm (5.7 inches)78%very high
June Weather21°C (69°F)151 mm (5.9 inches)79%very high
July Weather23°C (74°F)114 mm (4.5 inches)70%very high
August Weather22°C (72°F)94 mm (3.7 inches)59%very high
September Weather19°C (67°F)107 mm (4.2 inches)68%very high
October Weather14°C (57°F)115 mm (4.5 inches)80%high
November Weather6°C (43°F)86 mm (3.4 inches)86%moderate
December Weather3°C (37°F)126 mm (4.9 inches)85%moderate

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