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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 5°C (42°F), with extremes ranging from a chilly -15°C (5°F) to a warm 24°C (76°F). Expect about 83 mm (3.3 in) of precipitation over 8 days, contributing to an average humidity of 82%. Stay prepared for a mix of cool days and occasional rain!

January Temperature in Rock Island

In January in Rock Island, the average temperature is 5°C (42°F). The maximum can reach 24°C (76°F), while the minimum can drop as low as -15°C (5°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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 5°C (42°F), with highs reaching up to 24°C (76°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec414555617179838177645147
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 reaches 83 mm (3.3 in) over the course of 8 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 83 mm (3.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec831131191352008780116661317085
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 82%. With an average temperature of 5°C (42°F), this humidity feels like a wet chill that seeps into your bones, making outdoor exploration uncomfortable and dampening the joy of traveling.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rock Island for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710111111109754
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 Weather5°C (42°F)83 mm (3.3 inches)82%moderate
February Weather7°C (45°F)113 mm (4.5 inches)79%high
March Weather13°C (56°F)119 mm (4.7 inches)77%high
April Weather16°C (61°F)135 mm (5.3 inches)78%very high
May Weather22°C (71°F)200 mm (7.9 inches)82%extreme
June Weather26°C (79°F)87 mm (3.4 inches)81%extreme
July Weather28°C (83°F)80 mm (3.1 inches)75%extreme
August Weather27°C (81°F)116 mm (4.6 inches)61%very high
September Weather25°C (77°F)66 mm (2.6 inches)59%very high
October Weather18°C (64°F)131 mm (5.2 inches)69%high
November Weather11°C (52°F)69 mm (2.7 inches)82%moderate
December Weather8°C (47°F)85 mm (3.3 inches)87%moderate

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