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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 Falls, Illinois, with an average temperature varying between 27.7°F (-2.4°C) and 14.9°F (-9.5°C). Rock Falls's January weather reaches an average high of 27.7°F (-2.4°C) and an average low of 14.9°F (-9.5°C), making it the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Rock Falls, Illinois, with temperature in the range of an average low of 18.5°F (-7.5°C) and an average high of 31.6°F (-0.2°C). Transitioning into February, Rock Falls records an average high-temperature of a still freezing cold 31.6°F (-0.2°C), almost identical to January's 27.7°F (-2.4°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Rock Falls, Illinois, with an average temperature fluctuating between 31.3°F (-0.4°C) and 45.9°F (7.7°C). Rock Falls in March experiences an increase in the average high-temperature, moving from February's freezing cold 31.6°F (-0.2°C) to a chilly 45.9°F (7.7°C). Weather in March »
Weather in April
April is a mild spring month in Rock Falls, Illinois, with an average temperature varying between 57.9°F (14.4°C) and 41.4°F (5.2°C). The arrival of April brings an increase in high-temperatures, moving from a frosty 45.9°F (7.7°C) in March to a mild 57.9°F (14.4°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Rock Falls, Illinois, with an average temperature varying between 69.4°F (20.8°C) and 52.5°F (11.4°C). The onset of May brings a rise in the average high-temperature, elevating from a refreshing 57.9°F (14.4°C) in April to an agreeable 69.4°F (20.8°C). Weather in May »
Weather in June
June, the first month of the summer in Rock Falls, is a moderately hot month, with an average temperature fluctuating between 61.3°F (16.3°C) and 78.3°F (25.7°C). In Rock Falls, the average high-temperature in June slightly increases from an agreeable 69.4°F (20.8°C) in May to a moderately hot 78.3°F (25.7°C). Weather in June »
Weather in July
July, like June, in Rock Falls, Illinois, is another warm summer month, with an average temperature fluctuating between 63.9°F (17.7°C) and 80.2°F (26.8°C). With average high temperatures of 80.2°F (26.8°C) and lows of 63.9°F (17.7°C), July is the warmest month. Weather in July »
Weather in August
August, the last month of the summer in Rock Falls, is another warm month, with an average temperature fluctuating between 79.3°F (26.3°C) and 61.7°F (16.5°C). As Rock Falls welcomes August, the average high-temperature records at a still moderately hot 79.3°F (26.3°C), marking an insignificant deviation from the prior month. Weather in August »
Weather in September
September, the first month of the autumn in Rock Falls, is still a warm month, with an average temperature varying between 55.2°F (12.9°C) and 73.9°F (23.3°C). During the shift to September, a minor reduction in average high-temperature is observed, shifting from a moderately hot 79.3°F (26.3°C) in August to a still warm 73.9°F (23.3°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Rock Falls, Illinois, with an average temperature varying between 60.6°F (15.9°C) and 44.6°F (7°C). October brings a drop in Rock Falls's average high-temperature, falling from a warm 73.9°F (23.3°C) in September to a refreshing 60.6°F (15.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Rock Falls, Illinois, with an average temperature fluctuating between 32.4°F (0.2°C) and 45.5°F (7.5°C). In Rock Falls, stepping into November signifies a significant temperature decrement, moving down from October's refreshing 60.6°F (15.9°C) to a frosty 45.5°F (7.5°C). Weather in November »
Weather in December
December, the first month of the winter in Rock Falls, is still a cold month, with an average temperature ranging between min 23.2°F (-4.9°C) and max 33.8°F (1°C). Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a chilly 45.5°F (7.5°C) to an icy 33.8°F (1°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Rock Falls?
The coldest temperatures occur during January, when averages reach a peak of 27.7°F (-2.4°C) and a low of 14.9°F (-9.5°C).
What is the most humid month in Rock Falls?
The months with the highest humidity in Rock Falls, Illinois, are January and July, with an average relative humidity of 85%.
What is the driest month in Rock Falls?
The months with the least rainfall are January and February Rain falls for 4.8 days and accumulates 0.75" (19mm) of rain.
How much does it rain in Rock Falls?
Throughout the year, there are 130.2 rainfall days, and 17.36" (441mm) of precipitation is accumulated.
When does it snow in Rock Falls?
January through April, October through December are months with snowfall.
What is the snowiest month in Rock Falls?
January is the month with the most snowfall in Rock Falls. Snow falls for 10.2 days and accumulates 2.56" (65mm) of snow.
How many days does it snow in Rock Falls?
Throughout the year, there are 34.2 snowfall days, and 7.87" (200mm) of snow is accumulated.
What is the month with the least sunshine in Rock Falls?
January has the least sunshine of the year, with an average of 3.8h of sunshine.
When is Daylight Saving Time (DST) in Rock Falls?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rock Falls, 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 Falls?
May is the month with the most rainfall in Rock Falls. Rain falls for 17.3 days and accumulates 2.83" (72mm) of precipitation.
When it does not snow in Rock Falls?
In Rock Falls, Illinois, snow does not fall in May through September.
When are the longest days in Rock Falls?
The month with the longest days in Rock Falls is June, with an average of 15h and 12min of daylight.
What time of the year is the hottest in Rock Falls?
In Rock Falls, Illinois, temperatures reach their average annual highs in July, measuring 80.2°F (26.8°C) and a minimum average of 63.9°F (17.7°C).
What month has the most sunshine in Rock Falls?
With an average of 9.8h of sunshine, July has the most sunshine of the year in Rock Falls.
What is the month with the highest UV index in Rock Falls?
The month with the highest UV index in Rock Falls is July, with an average maximum UV index of 6.
What is the least humid month in Rock Falls?
With an average relative humidity of 73%, October is the least humid month.
What is the month with the shortest days in Rock Falls?
December has the shortest days of the year in Rock Falls, with an average of 9h and 12min of daylight.
What is the month with the lowest UV index in Rock Falls?
The month with the lowest UV index in Rock Falls is December, with an average maximum UV index of 1.
Average temperature
Rock Falls, IL
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.7°F).
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure
Rock Falls, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Rock Falls, IL
- Average wind speed in January:
10mph - Average wind speed in February:
10.1mph - Average wind speed in March:
9.9mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Rock Falls, IL
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Rock Falls, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
0.75" - Average rainfall in March:
1.1" - Average rainfall in April:
1.89" - Average rainfall in May:
2.83" - Average rainfall in June:
2.13"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.34" - Average rainfall in September:
1.26" - Average rainfall in October:
1.65" - Average rainfall in November:
1.02" - Average rainfall in December:
0.83"
The wettest month (with the highest rainfall) is May (2.83").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days
Rock Falls, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
5 days - Average rainfall days in March:
11.1 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
16.5 days
- Average rainfall days in July:
14.1 days - Average rainfall days in August:
12.5 days - Average rainfall days in September:
9.7 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
5.7 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (4.8 days).
Average snowfall
Rock Falls, IL
The month with the highest snowfall is January (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Rock Falls, IL
- Average snowfall days in January:
10.2 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
4.4 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:
2.5 days - Average snowfall days in December:
7.4 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rock Falls, 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 4min - 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 12min).
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 0min - 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:
9h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Rock Falls, IL
- Average sunshine days in January:
17 days - Average sunshine days in February:
16.2 days - Average sunshine days in March:
16.7 days - Average sunshine days in April:
13.1 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
12.7 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
18.4 days - Average sunshine days in October:
18.6 days - Average sunshine days in November:
18.8 days - Average sunshine days in December:
18.8 days
The months with the most sunshine days are November and December (18.8 days).
The month with the least sunshine days is June (11.3 days).
Average UV index
Rock Falls, IL
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Rock Falls, IL
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility
Rock Falls, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Rock Falls, Illinois, USA
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