Expand
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 Valley, Iowa, with an average temperature fluctuating between 10.8°F (-11.8°C) and 24.1°F (-4.4°C). January, recording an average high temperature of 24.1°F (-4.4°C) and a low temperature of 10.8°F (-11.8°C), is Rock Valley's coldest month. Weather in January »
Weather in February
February, the last month of the winter in Rock Valley, is another freezing cold month, with an average temperature ranging between min 14.4°F (-9.8°C) and max 27.7°F (-2.4°C). With the advent of February, Rock Valley's high-temperatures adjust to a still subzero cold 27.7°F (-2.4°C), closely aligning with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Rock Valley, is a chilly month, with an average temperature ranging between max 44.1°F (6.7°C) and min 28.9°F (-1.7°C). March's arrival witnesses a distinct temperature rise, advancing from February's subzero cold 27.7°F (-2.4°C) to a frosty 44.1°F (6.7°C). Weather in March »
Weather in April
April is a refreshing spring month in Rock Valley, Iowa, with an average temperature fluctuating between 56.3°F (13.5°C) and 39.9°F (4.4°C). As April arrives, a rise in the average high-temperature is observed, moving from a chilly 44.1°F (6.7°C) in March to a moderate 56.3°F (13.5°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Rock Valley, Iowa, with an average temperature ranging between min 51.1°F (10.6°C) and max 68.5°F (20.3°C). May brings a rise in Rock Valley's average high-temperature, moving from a refreshing 56.3°F (13.5°C) in April to an agreeable 68.5°F (20.3°C). Weather in May »
Weather in June
June, the first month of the summer in Rock Valley, is a warm month, with an average temperature ranging between min 61.3°F (16.3°C) and max 77.9°F (25.5°C). The transition from May to June brings a temperature rise, with average high-temperatures increasing from an agreeable 68.5°F (20.3°C) to a warm 77.9°F (25.5°C). Weather in June »
Weather in July
July, like June, in Rock Valley, Iowa, is another warm summer month, with temperature in the range of an average high of 81.9°F (27.7°C) and an average low of 63.5°F (17.5°C). July, with an average high of 81.9°F (27.7°C) and a low of 63.5°F (17.5°C), signifies the warmest month of the year. During July, the heat index is evaluated at a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Rock Valley, is another warm month, with an average temperature ranging between min 60.3°F (15.7°C) and max 80.4°F (26.9°C). The transition from July to August brings an average high-temperature of a still moderately hot 80.4°F (26.9°C), barely different from July's 81.9°F (27.7°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Rock Valley, Iowa, with temperature in the range of an average low of 54°F (12.2°C) and an average high of 74.3°F (23.5°C). September witnesses a gentle descent in average high-temperature, descending from August's 80.4°F (26.9°C) to a still moderately hot 74.3°F (23.5°C). Weather in September »
Weather in October
October, the same as September, in Rock Valley, Iowa, is a moderate autumn month, with temperature in the range of an average high of 58.1°F (14.5°C) and an average low of 41.9°F (5.5°C). Witnessing a clear downswing, the average high-temperature during October drops from September's warm 74.3°F (23.5°C) to a moderate 58.1°F (14.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Rock Valley, Iowa, with an average temperature varying between 43.7°F (6.5°C) and 30°F (-1.1°C). As October gives way to November, the average high-temperature displays a considerable decrease, falling from a mild 58.1°F (14.5°C) to a chilly 43.7°F (6.5°C). Weather in November »
Weather in December
December, the first month of the winter in Rock Valley, is also a subzero cold month, with an average temperature fluctuating between 16.7°F (-8.5°C) and 28°F (-2.2°C). Rock Valley in December showcases a distinct temperature shift, moving from an average high of a frosty 43.7°F (6.5°C) in November to a freezing cold 28°F (-2.2°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
What time of the year is the coldest in Rock Valley?
January is Rock Valley's coldest month, registering average high temperatures of 24.1°F (-4.4°C) and lows of 10.8°F (-11.8°C).
What is the most humid month in Rock Valley?
With an average relative humidity of 87%, January is the most humid month.
What is the driest month in Rock Valley?
January is the month with the least rainfall in Rock Valley, Iowa. Rain falls for 4.2 days and accumulates 0.75" (19mm) of precipitation.
How many days does it rain in Rock Valley?
In Rock Valley, Iowa, during the entire year, the rain falls for 130 days and collects up to 24.09" (612mm) of precipitation.
When does it snow in Rock Valley?
January through May, October through December are months with snowfall in Rock Valley.
How much does it snow in Rock Valley?
In Rock Valley, Iowa, during the entire year, snow falls for 49.2 days and aggregates up to 19.41" (493mm) of snow.
What is the month with the least sunshine in Rock Valley?
The month with the least sunshine in Rock Valley is January, with an average of 4.1h of sunshine.
What is the month with the lowest UV index in Rock Valley?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
What is the snowiest month in Rock Valley?
February is the month with the most snowfall in Rock Valley, Iowa. Snow falls for 9.7 days and accumulates 4.49" (114mm) of snow.
When is Daylight Saving Time (DST) in Rock Valley?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 Valley?
June is the month with the most rainfall in Rock Valley, Iowa. Rain falls for 18.8 days and accumulates 3.78" (96mm) of precipitation.
When it does not snow in Rock Valley?
June through September are months without snowfall in Rock Valley, Iowa.
When are the longest days in Rock Valley?
The month with the longest days is June, with an average of 15h and 18min of daylight.
What is the month with the highest UV index in Rock Valley?
June and July, with an average maximum UV index of 6, are months with the highest UV index in Rock Valley.
What month is the hottest in Rock Valley?
With average high and low temperatures of 81.9°F (27.7°C) and 63.5°F (17.5°C) respectively, July is Rock Valley's warmest month.
What month has the most sunshine in Rock Valley?
The month with the most sunshine is July, with an average of 10.6h of sunshine.
What is the least humid month in Rock Valley?
October is the least humid month in Rock Valley, Iowa, with an average relative humidity of 67%.
What is the month with the shortest days in Rock Valley?
With an average of 9h and 0min of daylight, December has the shortest days of the year in Rock Valley.
Average temperature
Rock Valley, IA
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (24.1°F).
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure
Rock Valley, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.15"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.86"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed
Rock Valley, IA
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11.2mph - Average wind speed in May:
9.6mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
7.8mph - Average wind speed in August:
8mph - Average wind speed in September:
9.2mph - Average wind speed in October:
10.3mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity
Rock Valley, IA
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (67%).
Average rainfall
Rock Valley, IA
- Average rainfall in January:
0.75" - Average rainfall in February:
0.87" - Average rainfall in March:
1.65" - Average rainfall in April:
2.72" - Average rainfall in May:
3.35" - Average rainfall in June:
3.78"
The wettest month (with the highest rainfall) is June (3.78").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days
Rock Valley, IA
- Average rainfall days in January:
4.2 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
17.9 days - Average rainfall days in June:
18.8 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
11.8 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
6.1 days - Average rainfall days in December:
4.9 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall
Rock Valley, IA
- Average snowfall in January:
3.23" - Average snowfall in February:
4.49" - Average snowfall in March:
3.07" - Average snowfall in April:
2.64" - Average snowfall in May:
0.24" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.49").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Rock Valley, IA
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
9.7 days - Average snowfall days in March:
7.9 days - Average snowfall days in April:
2.7 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:
1.5 days - Average snowfall days in November:
4.3 days - Average snowfall days in December:
11 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Rock Valley, IA
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - 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 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - 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:
4h and 1min - Average sunshine in February:
5h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Rock Valley, IA
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
15.2 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
12.4 days - Average sunshine days in May:
11.2 days - Average sunshine days in June:
8.3 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
13.1 days - Average sunshine days in September:
15.3 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
18 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (8.3 days).
Average UV index
Rock Valley, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Rock Valley, IA
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Rock Valley, IA
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Rock Valley, Iowa, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location