Climate and monthly weather forecastRock Falls, IA
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Rock Falls, Iowa, with an average temperature varying between 22.5°F (-5.3°C) and 10°F (-12.2°C). Rock Falls records the coldest temperatures in January, averaging a high of 22.5°F (-5.3°C) and a low of 10°F (-12.2°C). Weather in January »Weather in February
The last month of the winter, February, is also a subzero cold month in Rock Falls, Iowa, with an average temperature varying between 13.5°F (-10.3°C) and 26.6°F (-3°C). With the onset of February, the average high-temperature registers at a still freezing cold 26.6°F (-3°C), subtly different from January's 22.5°F (-5.3°C). Weather in February »Weather in March
March, the first month of the spring in Rock Falls, is a wintry month, with an average temperature fluctuating between 41.5°F (5.3°C) and 27.7°F (-2.4°C). The shift into March is marked by a considerable temperature increase, with the average high-temperature soaring from a freezing cold 26.6°F (-3°C) in February to a wintry 41.5°F (5.3°C). Weather in March »Weather in April
April in Rock Falls, Iowa, is a cool spring month, with an average temperature fluctuating between 39.4°F (4.1°C) and 54.9°F (12.7°C). April sees a temperature increase, moving from a cold 41.5°F (5.3°C) in March to a cool 54.9°F (12.7°C). Weather in April »Weather in May
May, the last month of the spring in Rock Falls, is a comfortable month, with temperature in the range of an average high of 66.9°F (19.4°C) and an average low of 50.5°F (10.3°C). In Rock Falls, stepping into May brings a temperature increase, moving up from April's cool 54.9°F (12.7°C) to an enjoyable 66.9°F (19.4°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Rock Falls, Iowa, with an average temperature fluctuating between 60.6°F (15.9°C) and 76.8°F (24.9°C). Observing a rise in June, the average high-temperature goes from May's enjoyable 66.9°F (19.4°C) to a warm 76.8°F (24.9°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Rock Falls, Iowa, with temperature in the range of an average low of 62.6°F (17°C) and an average high of 79.3°F (26.3°C). July, with an average high of 79.3°F (26.3°C) and a low of 62.6°F (17°C), signifies the warmest month of the year. Weather in July »Weather in August
August, the last month of the summer in Rock Falls, is another warm month, with an average temperature varying between 59.9°F (15.5°C) and 77.5°F (25.3°C). The beginning of August records an average high-temperature of a still moderately hot 77.5°F (25.3°C), almost echoing the conditions of the previous month. Weather in August »Weather in September
The first month of the autumn, September, is also an agreeable month in Rock Falls, Iowa, with an average temperature fluctuating between 53.4°F (11.9°C) and 72.5°F (22.5°C). The advent of September reveals an average high-temperature of a pleasant 72.5°F (22.5°C), showing minimal difference from the prior month. Weather in September »Weather in October
October, the same as September, in Rock Falls, Iowa, is another mild autumn month, with an average temperature ranging between max 57.6°F (14.2°C) and min 42.6°F (5.9°C). A clear reduction in the average high-temperature marks the arrival of October, falling from a pleasant 72.5°F (22.5°C) in September to a mild 57.6°F (14.2°C). Weather in October »Weather in November
November, the last month of the autumn in Rock Falls, is also a frosty month, with an average temperature fluctuating between 42.8°F (6°C) and 30.2°F (-1°C). November's arrival witnesses a distinct drop in the average high-temperature, receding from October's refreshing 57.6°F (14.2°C) to a frosty 42.8°F (6°C). Weather in November »Weather in December
December, the first month of the winter in Rock Falls, is also a subzero cold month, with an average temperature varying between 18°F (-7.8°C) and 28.4°F (-2°C). In Rock Falls, the onset of December is marked by a decreased average high-temperature, declining from November's frosty 42.8°F (6°C) to a freezing cold 28.4°F (-2°C). Weather in December »Updated: Feb 12, 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, recording an average maximum temperature of 22.5°F (-5.3°C) and a minimum temperature of 10°F (-12.2°C).
The most humid month in Rock Falls, Iowa, is January, with an average relative humidity of 89%.
January is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.94" (24mm) of precipitation.
In Rock Falls, Iowa, during the entire year, the rain falls for 129.5 days and collects up to 25.98" (660mm) of precipitation.
January through May, October through December are months with snowfall in Rock Falls, Iowa.
In Rock Falls, during the entire year, snow falls for 50.1 days and aggregates up to 21.69" (551mm) of snow.
January has the least sunshine of the year in Rock Falls, with an average of 3.6h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 10.7 days and typically aggregates up to 5.94" (151mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rock Falls, Iowa, 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 June, when the rain falls for 17.8 days and typically aggregates up to 3.98" (101mm) of precipitation.
June through September are months without snowfall.
The month with the longest days in Rock Falls, Iowa, is June, with an average of 15h and 18min of daylight.
June and July, with an average maximum UV index of 6, are months with the highest UV index in Rock Falls, Iowa.
With an average high-temperature of 79.3°F (26.3°C) and an average low-temperature of 62.6°F (17°C), July is the warmest month in Rock Falls, Iowa.
The months with the most sunshine in Rock Falls are July and August, with an average of 9.7h of sunshine.
October is the least humid month in Rock Falls, Iowa, with an average relative humidity of 71%.
December has the shortest days of the year, with an average of 9h and 0min of daylight.
Average temperature
Rock Falls, IA
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.5°F).
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure
Rock Falls, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Rock Falls, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.3mph
- Average wind speed in July:
7.2mph - Average wind speed in August:
7.3mph - Average wind speed in September:
8.3mph - Average wind speed in October:
9.9mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.1mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity
Rock Falls, IA
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Rock Falls, IA
- Average rainfall in January:
0.94" - Average rainfall in February:
1.22" - Average rainfall in March:
1.57" - Average rainfall in April:
2.68" - Average rainfall in May:
3.35" - Average rainfall in June:
3.98"
- Average rainfall in July:
2.48" - Average rainfall in August:
2.36" - Average rainfall in September:
2.52" - Average rainfall in October:
2.24" - Average rainfall in November:
1.3" - Average rainfall in December:
1.34"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days
Rock Falls, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3 days - Average rainfall days in March:
9.7 days - Average rainfall days in April:
15 days - Average rainfall days in May:
16.7 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
14.7 days - Average rainfall days in August:
12.6 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
8 days - Average rainfall days in December:
5.5 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).
Average snowfall
Rock Falls, IA
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Rock Falls, IA
- Average snowfall days in January:
12.7 days - Average snowfall days in February:
10.7 days - Average snowfall days in March:
6.5 days - Average snowfall days in April:
2.4 days - Average snowfall days in May:
0.3 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:
1.2 days - Average snowfall days in November:
4.6 days - Average snowfall days in December:
11.7 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Rock Falls, IA
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
4h and 0min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 18min
- Average sunshine in July:
9h and 42min - Average sunshine in August:
9h and 42min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 12min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Rock Falls, IA
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
14.9 days - Average sunshine days in March:
15.9 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
12.7 days - Average sunshine days in June:
10.5 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
16.6 days - Average sunshine days in October:
17.2 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
16.4 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index
Rock Falls, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Rock Falls, IA
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility
Rock Falls, IA
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
