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January Weather in South Dayton, United States

Last updated: June 24, 2025

In January, the average temperature in South Dayton, United States hovers around -4°C (25°F). Expect chilly extremes, with minimums plunging to -23°C (-8°F) and rare highs reaching 17°C (63°F). While you bundle up, be prepared for some wet days, as 102 mm (4.0 in) of precipitation can fall over 15 days. Humidity remains high at 91%, making it feel even colder.

January Temperature in South Dayton

In January in South Dayton, the average temperature is -4°C (25°F), with maximums reaching 17°C (63°F) and minimums dropping to as low as -23°C (-8°F). Be prepared for a wide range of temperatures if you plan to travel during this month.

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

The chart illustrates January temperature patterns in South Dayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Dayton, January typically has an average temperature of -4°C (25°F), with highs reaching up to 17°C (63°F) and lows dropping to around -23°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec252834445765706862523731
Data source: Temperature data for South Dayton 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.

January Precipitation in South Dayton

In South Dayton in January, the precipitation amount is 102 mm (4.0 in) over the course of 15 days.

January Precipitation Trends in South Dayton

The chart displays monthly precipitation patterns in South Dayton, 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 Dayton, January typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec10211010313013514615411389148125118
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in South Dayton

In South Dayton in January humidity is 91%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that penetrates your clothing, making it uncomfortable for traveling as every gust of wind amplifies the cold and dampness in the air.

January Average Humidity in South Dayton

This chart illustrates the average monthly humidity levels in South Dayton, 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 Dayton is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in South Dayton

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

Maximum UV Index Levels in South Dayton for January

The chart shows the monthly maximum UV Index (UVI) for South Dayton 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 Dayton typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: South Dayton 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 Dayton Compares to Other Months

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

This table compares monthly weather conditions in South Dayton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)102 mm (4.0 inches)91%moderate
February Weather-2°C (28°F)110 mm (4.3 inches)91%moderate
March Weather1°C (34°F)103 mm (4.1 inches)88%high
April Weather7°C (45°F)130 mm (5.1 inches)88%very high
May Weather14°C (57°F)135 mm (5.3 inches)82%very high
June Weather18°C (65°F)146 mm (5.7 inches)79%very high
July Weather21°C (70°F)154 mm (6.1 inches)77%very high
August Weather20°C (68°F)113 mm (4.4 inches)72%very high
September Weather17°C (62°F)88 mm (3.5 inches)76%very high
October Weather11°C (52°F)147 mm (5.8 inches)83%high
November Weather3°C (37°F)125 mm (4.9 inches)88%moderate
December Weather-1°C (31°F)118 mm (4.6 inches)87%low

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