Climate and monthly weather forecastRock Island, IL
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Rock Island, Illinois, with temperature in the range of an average high of 28°F (-2.2°C) and an average low of 15.6°F (-9.1°C). Rock Island's coldest weather arrives in January, when temperatures average a high of 28°F (-2.2°C) and a low of 15.6°F (-9.1°C). Weather in January »Weather in February
The last month of the winter, February, is an icy month in Rock Island, Illinois, with an average temperature ranging between max 32.7°F (0.4°C) and min 19.6°F (-6.9°C). The average high-temperature during February is a cold 32.7°F (0.4°C), almost matching the conditions of the preceding month. Weather in February »Weather in March
March, the first month of the spring in Rock Island, is a chilly month, with an average temperature fluctuating between 46.8°F (8.2°C) and 32°F (0°C). With the onset of March, Rock Island's average high-temperature sees a rise, moving from February's icy 32.7°F (0.4°C) to a chilly 46.8°F (8.2°C). Weather in March »Weather in April
April is a mild spring month in Rock Island, Illinois, with an average temperature varying between 59°F (15°C) and 42.4°F (5.8°C). An increase in the average high-temperature marks April, moving from March's chilly 46.8°F (8.2°C) to a mild 59°F (15°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Rock Island, Illinois, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 53.2°F (11.8°C). An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a mild 59°F (15°C) to a pleasant 70.3°F (21.3°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Rock Island, Illinois, with an average temperature varying between 62.1°F (16.7°C) and 79°F (26.1°C). June's arrival signals a modest temperature shift, moving from an agreeable 70.3°F (21.3°C) in May to a warm 79°F (26.1°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Rock Island, Illinois, with an average temperature varying between 81.7°F (27.6°C) and 64.9°F (18.3°C). July, characterized by an average high temperature of 81.7°F (27.6°C) and a low temperature of 64.9°F (18.3°C), is generally the warmest month. In July, the average heat index is evaluated at a hot 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Rock Island, Illinois, with temperature in the range of an average high of 80.8°F (27.1°C) and an average low of 62.6°F (17°C). Rock Island observes an average high-temperature of a still warm 80.8°F (27.1°C) in August, barely different from 81.7°F (27.6°C) in July. Weather in August »Weather in September
September, the first month of the autumn in Rock Island, is still a warm month, with temperature in the range of an average high of 75.4°F (24.1°C) and an average low of 56.3°F (13.5°C). The transition to September results in a modest reduction in average high-temperature, moving from 80.8°F (27.1°C) in August to a still moderately hot 75.4°F (24.1°C). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in Rock Island, Illinois, with an average temperature varying between 45°F (7.2°C) and 61.3°F (16.3°C). October implies a gentle temperature shift, with average high-temperatures reducing from September's moderately hot 75.4°F (24.1°C) to a refreshing 61.3°F (16.3°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Rock Island, Illinois, with an average temperature ranging between max 46.8°F (8.2°C) and min 33.3°F (0.7°C). November indicates a noticeable reduction in the average high-temperature, moving down from an enjoyable 61.3°F (16.3°C) in October to a frosty 46.8°F (8.2°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Rock Island, Illinois, with an average temperature varying between 23.7°F (-4.6°C) and 34.3°F (1.3°C). As November transitions into December, Rock Island sees a drop in the average high-temperature, transitioning from a frosty 46.8°F (8.2°C) to a wintry 34.3°F (1.3°C). Weather in December »Updated: Jul 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January proves to be the coldest month in Rock Island, recording an average maximum temperature of 28°F (-2.2°C) and a minimum temperature of 15.6°F (-9.1°C).
The months with the highest humidity are January and July, with an average relative humidity of 83%.
Throughout the year, there are 138.1 rainfall days, and 27.32" (694mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
The month with the most snowfall is January, when snow falls for 10.9 days and typically aggregates up to 3.98" (101mm) of snow.
In Rock Island, during the entire year, snow falls for 35.5 days and aggregates up to 12.8" (325mm) of snow.
January has the least sunshine of the year, with an average of 3.9h of sunshine.
With an average maximum UV index of 1, January is the month with the lowest UV index.
The month with the least rainfall is February, when the rain falls for 4.8 days and typically collects 1.1" (28mm) of precipitation.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rock Island, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The month with the most rainfall is May, when the rain falls for 17.5 days and typically aggregates up to 4.49" (114mm) of precipitation.
May through September are months without snowfall.
The month with the longest days is June, with an average of 15h and 6min of daylight.
In Rock Island, July is identified by the average highest temperatures, reaching a peak of 81.7°F (27.6°C) and a low of 64.9°F (18.3°C).
The month with the most sunshine is July, with an average of 10.2h of sunshine.
The months with the highest UV index are July and August, with an average maximum UV index of 6.
October is the least humid month, with an average relative humidity of 71%.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Rock Island, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure
Rock Island, IL
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Rock Island, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.7mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity
Rock Island, IL
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Rock Island, IL
- Average rainfall in January:
1.3" - Average rainfall in February:
1.1" - Average rainfall in March:
1.85" - Average rainfall in April:
3.03" - Average rainfall in May:
4.49" - Average rainfall in June:
3.39"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days
Rock Island, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
11 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
13.3 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
12 days - Average rainfall days in November:
8.6 days - Average rainfall days in December:
6.9 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).
Average snowfall
Rock Island, IL
The month with the highest snowfall is January (3.98").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Rock Island, IL
- Average snowfall days in January:
10.9 days - Average snowfall days in February:
9.2 days - Average snowfall days in March:
4.7 days - Average snowfall days in April:
1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
2.3 days - Average snowfall days in December:
6.9 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rock Island, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 6min - Average sunshine in March:
6h and 18min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 12min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Rock Island, IL
- Average sunshine days in January:
16.4 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
12 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
12 days
- Average sunshine days in July:
12.5 days - Average sunshine days in August:
15.7 days - Average sunshine days in September:
17.4 days - Average sunshine days in October:
17.2 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
17.8 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index
Rock Island, IL
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Rock Island, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Rock Island, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
