January Weather in Smithfield, United States

Last updated: June 24, 2025

In Smithfield, United States, the average temperature in January hovers around 5°C (42°F). However, be prepared for a broad range: temperatures can dip as low as -19°C (-1°F) and rise to a maximum of 23°C (74°F). This month typically sees 85 mm (3.3 in) of precipitation spread over 8 days, contributing to an average humidity of 84%.

January Temperature in Smithfield

In January in Smithfield, the average temperature is 5°C (42°F), with maximums that can reach 23°C (74°F) and minimums that can drop as low as -19°C (-1°F). Travelers should be prepared for a wide range of temperatures, making layers an essential part of their packing list.

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

The chart illustrates January 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, January typically has an average temperature of 5°C (42°F), with highs reaching up to 23°C (74°F) and lows dropping to around -19°C (-1°F).

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

January Precipitation in Smithfield

In Smithfield in January, the precipitation amount is 85 mm (3.3 in) over the course of 8 days.

January Precipitation Trends in Smithfield

The chart displays monthly precipitation patterns in Smithfield, 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 Smithfield, January typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Smithfield

In Smithfield in January, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.

January Average Humidity in Smithfield

This chart illustrates the average monthly humidity levels in Smithfield, 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 Smithfield is approximately 84%, 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 Smithfield

In Smithfield in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Smithfield 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 Smithfield typically reaches 3, which falls under the moderate exposure category.

Data source: Smithfield 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 Smithfield Compares to Other Months

Weather in Smithfield varies notably across the year, with each month offering distinct climate conditions. This page compares January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	85 mm (3.3 inches)	84%	moderate
February Weather	8°C (47°F)	107 mm (4.2 inches)	83%	high
March Weather	10°C (51°F)	88 mm (3.5 inches)	82%	high
April Weather	16°C (61°F)	106 mm (4.2 inches)	81%	very high
May Weather	20°C (69°F)	122 mm (4.8 inches)	80%	very high
June Weather	24°C (76°F)	117 mm (4.6 inches)	82%	very high
July Weather	27°C (81°F)	135 mm (5.3 inches)	81%	extreme
August Weather	26°C (79°F)	169 mm (6.7 inches)	81%	very high
September Weather	23°C (74°F)	126 mm (4.9 inches)	78%	very high
October Weather	18°C (65°F)	89 mm (3.5 inches)	80%	very high
November Weather	11°C (52°F)	76 mm (3.0 inches)	84%	moderate
December Weather	8°C (46°F)	84 mm (3.3 inches)	84%	moderate