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January Weather in Saint Charles, United States

Last updated: June 24, 2025

In January, the average temperature in Saint Charles, United States hovers around -4°C (25°F). Be prepared for extremes, as temperatures can plummet to a chilling -25°C (-13°F) or reach a maximum of 15°C (59°F). Expect 59 mm (2.3 in) of precipitation spread over 8 days, and with an average humidity of 88%, it's a month that calls for cozy clothing and perhaps a warm drink!

January Temperature in Saint Charles

In January in Saint Charles, the average temperature is -4°C (25°F), with a maximum that can reach 15°C (59°F) and a minimum that can drop to -25°C (-13°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.

January Weather in Saint Charles: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Saint Charles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Charles, January typically has an average temperature of -4°C (25°F), with highs reaching up to 15°C (59°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec252636465969747264533831
Data source: Temperature data for Saint Charles 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 Saint Charles

In Saint Charles in January, the total precipitation amount is 59 mm (2.3 in) spread over 8 days.

January Precipitation Trends in Saint Charles

The chart displays monthly precipitation patterns in Saint Charles, 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 Saint Charles, January typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec5963618811512166761011126060
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Saint Charles

In Saint Charles in January, humidity is 88%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making outdoor excursions brisk and invigorating, yet challenging as you navigate the frosty air.

January Average Humidity in Saint Charles

This chart illustrates the average monthly humidity levels in Saint Charles, 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 Saint Charles is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Saint Charles

In Saint Charles in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Saint Charles, you can visit Hourly UV Index in Saint Charles.

Maximum UV Index Levels in Saint Charles for January

The chart shows the monthly maximum UV Index (UVI) for Saint Charles 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 Saint Charles typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Saint Charles 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 Saint Charles Compares to Other Months

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

This table compares monthly weather conditions in Saint Charles, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)59 mm (2.3 inches)88%low
February Weather-3°C (26°F)63 mm (2.5 inches)87%moderate
March Weather2°C (36°F)61 mm (2.4 inches)85%moderate
April Weather8°C (46°F)88 mm (3.4 inches)86%very high
May Weather15°C (59°F)115 mm (4.5 inches)80%very high
June Weather21°C (70°F)121 mm (4.8 inches)80%very high
July Weather23°C (75°F)66 mm (2.6 inches)80%very high
August Weather22°C (72°F)76 mm (3.0 inches)80%very high
September Weather18°C (65°F)101 mm (4.0 inches)80%high
October Weather11°C (53°F)112 mm (4.4 inches)84%moderate
November Weather3°C (38°F)60 mm (2.4 inches)89%moderate
December Weather0°C (32°F)60 mm (2.4 inches)86%low

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