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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, the same as December, in Keystone, Iowa, is a freezing cold winter month, with temperature in the range of an average high of 25.9°F (-3.4°C) and an average low of 13.5°F (-10.3°C). January, with its average high-temperature of 25.9°F (-3.4°C) and an average low-temperature of 13.5°F (-10.3°C), holds the record as the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Keystone, Iowa, with temperature in the range of an average low of 17.1°F (-8.3°C) and an average high of 30.2°F (-1°C). Keystone's weather in February, with an average high-temperature of a still freezing cold 30.2°F (-1°C), subtly shifts from January's 25.9°F (-3.4°C). Weather in February »
Weather in March
March, the first month of the spring in Keystone, is a chilly month, with temperature in the range of an average high of 45.1°F (7.3°C) and an average low of 30.6°F (-0.8°C). March is marked by a significant increase, with the average high-temperature advancing from a subzero cold 30.2°F (-1°C) in February to a frosty 45.1°F (7.3°C). Weather in March »
Weather in April
April in Keystone, Iowa, is a mild spring month, with temperature in the range of an average high of 57.7°F (14.3°C) and an average low of 41.4°F (5.2°C). Keystone's April weather brings a rise in high-temperatures, moving from a chilly 45.1°F (7.3°C) in March to a refreshing 57.7°F (14.3°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Keystone, Iowa, with an average temperature fluctuating between 52.2°F (11.2°C) and 68.7°F (20.4°C). With the onset of May, Keystone sees a temperature rise, with the average high-temperature moving from April's moderate 57.7°F (14.3°C) to a pleasant 68.7°F (20.4°C). Weather in May »
Weather in June
June, the first month of the summer in Keystone, is a moderately hot month, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 78.1°F (25.6°C). The shift from May to June sees an increase in the average high-temperature, transitioning from an agreeable 68.7°F (20.4°C) to a warm 78.1°F (25.6°C). Weather in June »
Weather in July
July, like June, in Keystone, Iowa, is a moderately hot summer month, with an average temperature fluctuating between 64.4°F (18°C) and 80.8°F (27.1°C). July is the month when Keystone's temperatures reach their peak, with averages of 80.8°F (27.1°C) and lows of 64.4°F (18°C). July's heat index is estimated at a hot 86°F (30°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Keystone, Iowa, with an average temperature ranging between min 61.9°F (16.6°C) and max 79.5°F (26.4°C). As August takes its course, Keystone's average high-temperature registers at a still warm 79.5°F (26.4°C), closely aligning with the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Keystone, Iowa, with an average temperature varying between 74.3°F (23.5°C) and 55°F (12.8°C). With the onset of September, a modest change to a still moderately hot 74.3°F (23.5°C) from August's 79.5°F (26.4°C) is noted in high-temperature. Weather in September »
Weather in October
October, the same as September, in Keystone, Iowa, is a moderate autumn month, with an average temperature fluctuating between 59.9°F (15.5°C) and 44.1°F (6.7°C). October's onset brings a noticeable temperature drop, falling from a warm 74.3°F (23.5°C) in September to a moderate 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Keystone, Iowa, with an average temperature ranging between max 45.1°F (7.3°C) and min 32.2°F (0.1°C). With the onset of November, Keystone's average high-temperature witnesses a clear drop, receding from October's refreshing 59.9°F (15.5°C) to a frosty 45.1°F (7.3°C). Weather in November »
Weather in December
December, the first month of the winter in Keystone, is also a wintry month, with temperature in the range of an average low of 21.7°F (-5.7°C) and an average high of 32.7°F (0.4°C). During Keystone's transition into December, the average high-temperature lessens, moving from a frosty 45.1°F (7.3°C) in November to an icy 32.7°F (0.4°C). Weather in December »
Updated: Aug 8, 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?
Keystone notes the coldest temperatures in January, with a average high of 25.9°F (-3.4°C) and a low of 13.5°F (-10.3°C).
What is the most humid month?
The most humid month is January, with an average relative humidity of 85%.
What is the driest month?
January is the month with the least rainfall. Rain falls for 4.5 days and accumulates 1.18" (30mm) of precipitation.
How many days does it rain?
In Keystone, during the entire year, the rain falls for 139 days and collects up to 29.49" (749mm) of precipitation.
When does it snow?
January through May, October through December are months with snowfall.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 9.6 days and typically aggregates up to 5.24" (133mm) of snow.
How much does it snow?
Throughout the year, there are 39 snowfall days, and 16.69" (424mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST)?
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 rainiest month?
May is the month with the most rainfall. Rain falls for 18.1 days and accumulates 4.61" (117mm) of precipitation.
When it does not snow?
In Keystone, snow does not fall in June through September.
When are the longest days?
The month with the longest days is June, with an average of 15h and 12min of daylight.
When is the highest UV index?
With an average maximum UV index of 6, June is the month with the highest UV index.
What part of the year is the hottest in Keystone?
In Keystone, the peak average temperatures are observed in July, with a high of 80.8°F (27.1°C) and a low of 64.4°F (18°C).
What month has the most sunshine?
The month with the most sunshine is July, with an average of 9.9h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 72%.
What is the month with the shortest days?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Keystone, IA
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (25.9°F).
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure
Keystone, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.89"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"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Keystone, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.8mph - Average wind speed in May:
9.2mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7mph - Average wind speed in September:
8.1mph - Average wind speed in October:
9.8mph - Average wind speed in November:
10.5mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity
Keystone, IA
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Keystone, IA
- Average rainfall in January:
1.18" - Average rainfall in February:
1.26" - Average rainfall in March:
1.89" - Average rainfall in April:
3.23" - Average rainfall in May:
4.61" - Average rainfall in June:
4.13"
- Average rainfall in July:
3.19" - Average rainfall in August:
2.24" - Average rainfall in September:
2.52" - Average rainfall in October:
2.17" - Average rainfall in November:
1.57" - Average rainfall in December:
1.5"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days
Keystone, IA
- Average rainfall days in January:
4.5 days - Average rainfall days in February:
4.6 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
18.1 days - Average rainfall days in June:
19.3 days
- Average rainfall days in July:
17.2 days - Average rainfall days in August:
13.3 days - Average rainfall days in September:
11.9 days - Average rainfall days in October:
10.1 days - Average rainfall days in November:
8.3 days - Average rainfall days in December:
6.4 days
The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall
Keystone, IA
The month with the highest snowfall is January (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Keystone, IA
- Average snowfall days in January:
9.6 days - Average snowfall days in February:
10.6 days - Average snowfall days in March:
5.3 days - Average snowfall days in April:
1.4 days - Average snowfall days in May:
0.2 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:
0.6 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
8.5 days
The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Keystone, IA
- Average daylight in January:
9h and 3min - 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:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 2min
- 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 2min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Keystone, IA
- Average sunshine days in January:
18.2 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
10.6 days - Average sunshine days in June:
8.4 days
- Average sunshine days in July:
10.1 days - Average sunshine days in August:
15.1 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
18.3 days - Average sunshine days in December:
18.2 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is June (8.4 days).
Average UV index
Keystone, IA
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Keystone, IA
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility
Keystone, 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).
Keystone, Iowa, USA
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