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January Weather in Rock Island, United States

Last updated: June 24, 2025

In January, the average temperature in Rock Island, United States hovers around -2°C (28°F). Expect cold conditions with minimums plummeting to -23°C (-10°F), while maximums can reach a brisk 7°C (45°F). Rain or snow may accompany you, with an average precipitation of 84 mm (3.3 in) over 14 days. Be prepared for dampness, as the average humidity sits at a brisk 86%.

January Temperature in Rock Island

In January in Rock Island, the average temperature is -2°C (28°F). The maximum can reach 7°C (45°F), and the minimum can be as low as -23°C (-10°F). Travelers should be prepared for cold weather and pack accordingly for a range of temperatures.

January Weather in Rock Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Rock Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Island, January typically has an average temperature of -2°C (28°F), with highs reaching up to 7°C (45°F) and lows dropping to around -23°C (-10°F).
JanFebMarAprMayJunJulAugSepOctNovDec282937465663706960463629
Data source: Temperature data for Rock Island 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 Rock Island

In Rock Island in January, the precipitation amount is 84 mm (3.3 in) over the course of 14 days.

January Precipitation Trends in Rock Island

The chart displays monthly precipitation patterns in Rock Island, 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 Rock Island, January typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec8476464127143526566479
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Rock Island

In Rock Island in January, humidity is 86%. With an average temperature of -2°C (28°F), this humidity feels like a dense fog wrapping around you, making it feel even colder and creating an uncomfortable chill that can dampen any plans for outdoor exploration.

January Average Humidity in Rock Island

This chart illustrates the average monthly humidity levels in Rock Island, 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 Rock Island is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Rock Island

In Rock Island 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 Rock Island, you can visit Hourly UV Index in Rock Island.

Maximum UV Index Levels in Rock Island for January

The chart shows the monthly maximum UV Index (UVI) for Rock Island 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 Rock Island typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467891097532
Data source: Rock Island 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 Rock Island Compares to Other Months

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

This table compares monthly weather conditions in Rock Island, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)84 mm (3.3 inches)86%low
February Weather-2°C (29°F)76 mm (3.0 inches)86%moderate
March Weather3°C (38°F)46 mm (1.8 inches)87%high
April Weather8°C (46°F)41 mm (1.6 inches)84%high
May Weather13°C (56°F)26 mm (1.0 inches)81%very high
June Weather17°C (63°F)14 mm (0.5 inches)82%very high
July Weather21°C (70°F)3 mm (0.1 inches)79%very high
August Weather21°C (70°F)5 mm (0.2 inches)63%very high
September Weather15°C (60°F)26 mm (1.0 inches)62%high
October Weather8°C (46°F)56 mm (2.2 inches)83%moderate
November Weather2°C (37°F)64 mm (2.5 inches)89%moderate
December Weather-1°C (30°F)79 mm (3.1 inches)88%low

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