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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is another subzero cold winter month in Rock Island, Illinois, with an average temperature fluctuating between 15.6°F (-9.1°C) and 28°F (-2.2°C). Rock Island records the coldest temperatures in January, averaging a high of 28°F (-2.2°C) and a low of 15.6°F (-9.1°C). Weather in January »
Weather in February
February, the last month of the winter in Rock Island, is a wintry month, with an average temperature fluctuating between 32.7°F (0.4°C) and 19.6°F (-6.9°C). Rock Island, Illinois, observes a minor difference in average high-temperatures between January's 28°F (-2.2°C) and February's 32.7°F (0.4°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Rock Island, Illinois, with temperature in the range of an average low of 32°F (0°C) and an average high of 46.8°F (8.2°C). Rock Island's transition into March is marked by a temperature shift, moving from a cold 32.7°F (0.4°C) in February to a chilly 46.8°F (8.2°C). Weather in March »
Weather in April
April in Rock Island, Illinois, is a refreshing spring month, with an average temperature fluctuating between 42.4°F (5.8°C) and 59°F (15°C). As April begins, there is an increase in the average high-temperature, moving from a frosty 46.8°F (8.2°C) in March to a moderate 59°F (15°C). Weather in April »
Weather in May
May, the last month of the spring in Rock Island, is a pleasant month, with an average temperature ranging between max 70.3°F (21.3°C) and min 53.2°F (11.8°C). Rock Island in May experiences an increase in the average high-temperature, moving from April's mild 59°F (15°C) to a pleasant 70.3°F (21.3°C). Weather in May »
Weather in June
June, the first month of the summer in Rock Island, is a warm month, with temperature in the range of an average high of 79°F (26.1°C) and an average low of 62.1°F (16.7°C). With the onset of June, Rock Island's average high-temperature sees a modest rise, moving from May's pleasant 70.3°F (21.3°C) to a warm 79°F (26.1°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Rock Island, Illinois, with an average temperature fluctuating between 64.9°F (18.3°C) and 81.7°F (27.6°C). July, noted for its average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C), is considered the warmest month. The heat index value for July is calculated to be 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 an average temperature fluctuating between 80.8°F (27.1°C) and 62.6°F (17°C). The initiation of August records an average high-temperature of a still warm 80.8°F (27.1°C), displaying a near consistency with the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Rock Island, is also a moderately hot month, with an average temperature fluctuating between 75.4°F (24.1°C) and 56.3°F (13.5°C). September marks a gentle change in average high-temperature, declining from August's warm 80.8°F (27.1°C) 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 temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 45°F (7.2°C). The decrease of average high-temperatures is mild in October, with a decline from a moderately hot 75.4°F (24.1°C) in September to an enjoyable 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). Rock Island in November showcases a distinct temperature shift, moving from an average high of a comfortable 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 temperature in the range of an average high of 34.3°F (1.3°C) and an average low of 23.7°F (-4.6°C). December weather is marked by a drop in the average high-temperature, falling from a chilly 46.8°F (8.2°C) in November to a cold 34.3°F (1.3°C). Weather in December »
[Resources]Frequently asked questions
What are the coldest months in Rock Island?
January is the coldest month, exhibiting average temperatures of 28°F (-2.2°C) at the peak and 15.6°F (-9.1°C) at the base.
What are the most humid months in Rock Island?
January and July, with an average relative humidity of 83%, are most humid months in Rock Island, Illinois.
How many days does it rain in Rock Island?
Throughout the year, in Rock Island, there are 138.1 rainfall days, and 27.32" (694mm) of precipitation is accumulated.
When does it snow in Rock Island?
Months with snowfall in Rock Island are January through April, October through December.
When does it snow the most in Rock Island?
January is the month with the most snowfall in Rock Island, Illinois. Snow falls for 10.9 days and accumulates 3.98" (101mm) of snow.
How many days does it snow in Rock Island?
In Rock Island, during the entire year, snow falls for 35.5 days and aggregates up to 12.8" (325mm) of snow.
What is the month with the least sunshine in Rock Island?
The month with the least sunshine in Rock Island is January, with an average of 3.9h of sunshine.
What is the month with the lowest UV index in Rock Island?
With an average maximum UV index of 1, January is the month with the lowest UV index in Rock Island, Illinois.
What is the driest month in Rock Island?
February is the month with the least rainfall in Rock Island. Rain falls for 4.8 days and accumulates 1.1" (28mm) of precipitation.
When is Daylight Saving Time (DST) in Rock Island?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rock Island, Illinois, 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.
What is the wettest month in Rock Island?
May is the month with the most rainfall in Rock Island. Rain falls for 17.5 days and accumulates 4.49" (114mm) of precipitation.
When it does not snow in Rock Island?
May through September are months without snowfall in Rock Island, Illinois.
When are the longest days in Rock Island?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What are the warmest months in Rock Island?
In Rock Island, July records the average highest temperatures, peaking at 81.7°F (27.6°C) and reaching a low of 64.9°F (18.3°C).
What month has the most sunshine in Rock Island?
With an average of 10.2h of sunshine, July has the most sunshine of the year.
What is the month with the highest UV index in Rock Island?
The months with the highest UV index are July and August, with an average maximum UV index of 6.
What is the least humid month in Rock Island?
October is the least humid month in Rock Island, Illinois, with an average relative humidity of 71%.
What is the month with the shortest days in Rock Island?
With an average of 9h and 12min of daylight, December has the shortest days of the year in Rock Island.
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 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
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).
Rock Island, Illinois, USA
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