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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 Keystone, Iowa, with an average temperature fluctuating between 25.9°F (-3.4°C) and 13.5°F (-10.3°C). In Keystone, the lowest average temperatures are observed in January, with a high of 25.9°F (-3.4°C) and a low of 13.5°F (-10.3°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Keystone, Iowa, with an average temperature fluctuating between 30.2°F (-1°C) and 17.1°F (-8.3°C). The arrival of February sees an average high-temperature of a still freezing cold 30.2°F (-1°C), hardly diverging 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). Keystone's transition into March is marked by a clear temperature shift, advancing from a freezing 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 an average temperature fluctuating between 41.4°F (5.2°C) and 57.7°F (14.3°C). The transition to April introduces an increase in the average high-temperature, shifting from a chilly 45.1°F (7.3°C) in March to a mild 57.7°F (14.3°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Keystone, Iowa, with an average temperature fluctuating between 52.2°F (11.2°C) and 68.7°F (20.4°C). Keystone's May weather brings a rise in high-temperatures, moving from a mild 57.7°F (14.3°C) in April to a pleasant 68.7°F (20.4°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Keystone, Iowa, with an average temperature ranging between max 78.1°F (25.6°C) and min 61.7°F (16.5°C). The onset of June marks an increase in the average high-temperature, moving from a pleasant 68.7°F (20.4°C) in May to a moderately hot 78.1°F (25.6°C). Weather in June »
Weather in July
July, like June, in Keystone, Iowa, is another warm summer month, with an average temperature ranging between max 80.8°F (27.1°C) and min 64.4°F (18°C). In Keystone, the peak temperatures are generally noted in July, averaging a high of 80.8°F (27.1°C) and a low of 64.4°F (18°C). For July, the heat index is evaluated at a tropical 86°F (30°C). Weather in July »
Weather in August
August, the last month of the summer in Keystone, is also a moderately hot month, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 61.9°F (16.6°C). Keystone experiences a subtle adjustment in high-temperatures to a still moderately hot 79.5°F (26.4°C) with the onset of August, maintaining near parity with July's 80.8°F (27.1°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Keystone, Iowa, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 55°F (12.8°C). The start of September marks an average high-temperature of a still warm 74.3°F (23.5°C), hardly distinguishable from the conditions in August. 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). With the onset of October, Keystone's average high-temperature experiences a noticeable drop, receding from September's warm 74.3°F (23.5°C) to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty 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). November's arrival is marked by a significant decrease in the average high-temperature, moving from a moderate 59.9°F (15.5°C) in October to a chilly 45.1°F (7.3°C). Weather in November »
Weather in December
December, the first month of the winter in Keystone, is still a cold month, with an average temperature ranging between min 21.7°F (-5.7°C) and max 32.7°F (0.4°C). The arrival of December corresponds with a shift in temperature, down from a frosty 45.1°F (7.3°C) in November to a wintry 32.7°F (0.4°C). Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Keystone?
Keystone's coldest weather arrives in January, when temperatures average a high of 25.9°F (-3.4°C) and a low of 13.5°F (-10.3°C).
What is the most humid month in Keystone?
January is the most humid month in Keystone, with an average relative humidity of 85%.
What is the driest month in Keystone?
January is the month with the least rainfall in Keystone. Rain falls for 4.5 days and accumulates 1.18" (30mm) of precipitation.
How many days does it rain in Keystone?
In Keystone, Iowa, during the entire year, the rain falls for 139 days and collects up to 29.49" (749mm) of precipitation.
When does it snow in Keystone?
January through May, October through December are months with snowfall.
What is the snowiest month in Keystone?
January is the month with the most snowfall in Keystone. Snow falls for 9.6 days and accumulates 5.24" (133mm) of snow.
How much does it snow in Keystone?
In Keystone, Iowa, during the entire year, snow falls for 39 days and aggregates up to 16.69" (424mm) of snow.
What is the month with the least sunshine in Keystone?
With an average of 4h of sunshine, January has the least sunshine of the year.
What are the months with the lowest UV index in Keystone?
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST) in Keystone?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Keystone, 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 rainiest month in Keystone?
The month with the most rainfall is May, when the rain falls for 18.1 days and typically aggregates up to 4.61" (117mm) of precipitation.
When it does not snow in Keystone?
In Keystone, Iowa, snow does not fall in June through September.
When are the longest days in Keystone?
With an average of 15h and 12min of daylight, June has the longest days of the year in Keystone, Iowa.
When is the highest UV index in Keystone?
The month with the highest UV index in Keystone is June, with an average maximum UV index of 6.
What part of the year is the hottest in Keystone?
July is the warmest month in Keystone, with the temperature often reaching an average high of 80.8°F (27.1°C) and an average low of 64.4°F (18°C).
What month has the most sunshine in Keystone?
July has the most sunshine of the year in Keystone, with an average of 9.9h of sunshine.
What is the least humid month in Keystone?
With an average relative humidity of 72%, October is the least humid month.
What is the month with the shortest days in Keystone?
The month with the shortest days in Keystone, Iowa, is December, with an average of 9h and 12min of daylight.
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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