Climate and monthly weather forecast
Rock Falls, IA

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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 »
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Frequently asked questions

What is the coldest time of year in Rock Falls?

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).

What is the most humid month in Rock Falls?

The most humid month in Rock Falls, Iowa, is January, with an average relative humidity of 89%.

What is the driest month in Rock Falls?

January is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.94" (24mm) of precipitation.

How many days does it rain in Rock Falls?

In Rock Falls, Iowa, during the entire year, the rain falls for 129.5 days and collects up to 25.98" (660mm) of precipitation.

When does it snow in Rock Falls?

January through May, October through December are months with snowfall in Rock Falls, Iowa.

How many days does it snow in Rock Falls?

In Rock Falls, during the entire year, snow falls for 50.1 days and aggregates up to 21.69" (551mm) of snow.

What is the month with the least sunshine in Rock Falls?

January has the least sunshine of the year in Rock Falls, with an average of 3.6h of sunshine.

What are the months with the lowest UV index in Rock Falls?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the snowiest month in Rock Falls?

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.

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, 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.

What is the wettest month in Rock Falls?

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.

When it does not snow in Rock Falls?

June through September are months without snowfall.

When are the longest days in Rock Falls?

The month with the longest days in Rock Falls, Iowa, is June, with an average of 15h and 18min of daylight.

What is the month with the highest UV index in Rock Falls?

June and July, with an average maximum UV index of 6, are months with the highest UV index in Rock Falls, Iowa.

What part of the year is the hottest in Rock Falls?

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.

What is the month with the most sunshine in Rock Falls?

The months with the most sunshine in Rock Falls are July and August, with an average of 9.7h of sunshine.

What is the least humid month in Rock Falls?

October is the least humid month in Rock Falls, Iowa, with an average relative humidity of 71%.

What is the month with the shortest days in Rock Falls?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

Average temperature
Rock Falls, IA

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).

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Average pressure
Rock Falls, IA

Average pressure - Rock Falls, IA

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).

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Average wind speed
Rock Falls, IA

Average wind speed - Rock Falls, IA

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).

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Average rainfall
Rock Falls, IA

Average rainfall - Rock Falls, IA

The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.94").

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Average rainfall days
Rock Falls, IA

Average rainfall days - Rock Falls, IA

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).

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Average snowfall
Rock Falls, IA

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").

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Average snowfall days
Rock Falls, IA

Average snowfall days - Rock Falls, IA

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).

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Average daylight / Average sunshine
Rock Falls, IA

Average daylight / Average sunshine - Rock Falls, IA

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).

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).

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Average sunshine days
Rock Falls, IA

Average sunshine days - Rock Falls, IA

The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).

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Average visibility
Rock Falls, IA

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).

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Rock Falls, Iowa, USA

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