nomadseason

January Weather in South Plainfield, United States

Last updated: June 24, 2025

In South Plainfield, United States, the average temperature in January hovers around 1°C (34°F). Expect a chill in the air, with minimum temperatures dipping to -17°C (2°F) and occasional warmth peaking at 19°C (67°F). The month sees about 65 mm (2.6 in) of precipitation over 8 days, while the average humidity remains high at 84%, creating a crisp yet damp atmosphere.

January Temperature in South Plainfield

In January in South Plainfield, the average temperature is 1°C (34°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures and bring appropriate clothing for both warm and cold conditions.

January Weather in South Plainfield: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in South Plainfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Plainfield, January typically has an average temperature of 1°C (34°F), with highs reaching up to 19°C (67°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787670604638
Data source: Temperature data for South Plainfield generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in South Plainfield

In South Plainfield in January, the total precipitation amount is 65 mm (2.6 in) spread over the course of 8 days.

January Precipitation Trends in South Plainfield

The chart displays monthly precipitation patterns in South Plainfield, 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 South Plainfield, January typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec651071071101291021401338913682106
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in South Plainfield

In South Plainfield in January humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

January Average Humidity in South Plainfield

This chart illustrates the average monthly humidity levels in South Plainfield, 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 South Plainfield is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in South Plainfield

In South Plainfield 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 South Plainfield, you can check the information here.

Maximum UV Index Levels in South Plainfield for January

The chart shows the monthly maximum UV Index (UVI) for South Plainfield 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 South Plainfield typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: South Plainfield 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 South Plainfield Compares to Other Months

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

This table compares monthly weather conditions in South Plainfield, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)65 mm (2.6 inches)84%moderate
February Weather3°C (37°F)107 mm (4.2 inches)82%moderate
March Weather6°C (43°F)107 mm (4.2 inches)81%high
April Weather11°C (53°F)110 mm (4.3 inches)78%very high
May Weather17°C (63°F)129 mm (5.1 inches)69%very high
June Weather22°C (72°F)102 mm (4.0 inches)69%very high
July Weather25°C (78°F)140 mm (5.5 inches)62%very high
August Weather24°C (76°F)133 mm (5.2 inches)65%very high
September Weather21°C (70°F)89 mm (3.5 inches)68%very high
October Weather16°C (60°F)136 mm (5.4 inches)74%high
November Weather8°C (46°F)82 mm (3.2 inches)82%moderate
December Weather3°C (38°F)106 mm (4.2 inches)80%low

Compare South Plainfield's Climate with Cities Worldwide