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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 a freezing cold winter month in O'Leary, Iowa, with an average temperature ranging between min 11.5°F (-11.4°C) and max 24.8°F (-4°C). O'Leary's January weather reaches an average high of 24.8°F (-4°C) and an average low of 11.5°F (-11.4°C), making it the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in O'Leary, Iowa, with an average temperature fluctuating between 15.4°F (-9.2°C) and 28.4°F (-2°C). In the transition from January to February, O'Leary reports an average high-temperature of a still freezing cold 28.4°F (-2°C), indicating a close resemblance to the prior month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in O'Leary, Iowa, with an average temperature ranging between min 29.7°F (-1.3°C) and max 44.8°F (7.1°C). O'Leary experiences a noticeable temperature shift with the start of March, with average high-temperatures moving from a freezing cold 28.4°F (-2°C) in February to a frosty 44.8°F (7.1°C). Weather in March »
Weather in April
April is a mild spring month in O'Leary, Iowa, with an average temperature varying between 40.6°F (4.8°C) and 57°F (13.9°C). As O'Leary enters April, the average high-temperature increases from the a frosty 44.8°F (7.1°C) of March to a refreshing 57°F (13.9°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in O'Leary, Iowa, with temperature in the range of an average low of 52.2°F (11.2°C) and an average high of 68.7°F (20.4°C). The arrival of May brings a temperature shift, with the average high-temperature escalating from a moderate 57°F (13.9°C) in April to an agreeable 68.7°F (20.4°C). Weather in May »
Weather in June
June, the first month of the summer in O'Leary, is a moderately hot month, with an average temperature ranging between max 78.1°F (25.6°C) and min 62.2°F (16.8°C). O'Leary's transition into June brings a rise 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 O'Leary, Iowa, is a moderately hot summer month, with an average temperature ranging between max 81.9°F (27.7°C) and min 64°F (17.8°C). O'Leary's July weather reaches an average high of 81.9°F (27.7°C) and an average low of 64°F (17.8°C), making it the warmest month. Throughout July, the heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in O'Leary, is another warm month, with temperature in the range of an average low of 61.2°F (16.2°C) and an average high of 80.1°F (26.7°C). The transition into August shows a subtle variation to a still warm 80.1°F (26.7°C) from July's 81.9°F (27.7°C) in the average high-temperature. Weather in August »
Weather in September
September, the first month of the autumn in O'Leary, is also a moderately hot month, with an average temperature ranging between min 54.9°F (12.7°C) and max 74.3°F (23.5°C). O'Leary's transition into September involves a gentle shift in temperature, receding from a warm 80.1°F (26.7°C) in August to a still moderately hot 74.3°F (23.5°C). Weather in September »
Weather in October
October, like September, is another mild autumn month in O'Leary, Iowa, with an average temperature varying between 58.1°F (14.5°C) and 42.6°F (5.9°C). O'Leary experiences a noticeable temperature shift with the start of October, with average high-temperatures moving from a moderately hot 74.3°F (23.5°C) in September to a moderate 58.1°F (14.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in O'Leary, Iowa, with an average temperature varying between 44.2°F (6.8°C) and 31.6°F (-0.2°C). O'Leary's average high-temperature decreases in November, falling from a mild 58.1°F (14.5°C) in October to a frosty 44.2°F (6.8°C). Weather in November »
Weather in December
The first month of the winter, December, is still a freezing cold month in O'Leary, Iowa, with an average temperature varying between 18.5°F (-7.5°C) and 29.3°F (-1.5°C). In O'Leary, stepping into December signifies a significant temperature decrement, moving down from November's frosty 44.2°F (6.8°C) to a subzero cold 29.3°F (-1.5°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 is the coldest time of year in O'Leary?
In O'Leary, January is known for its average lowest temperatures, reaching a high of 24.8°F (-4°C) and a low of 11.5°F (-11.4°C).
What is the most humid month in O'Leary?
The most humid month is January, with an average relative humidity of 86%.
What is the driest month in O'Leary?
The month with the least rainfall is January, when the rain falls for 3 days and typically collects 0.63" (16mm) of precipitation.
How many days does it rain in O'Leary?
In O'Leary, Iowa, during the entire year, the rain falls for 114 days and collects up to 21.46" (545mm) of precipitation.
When does it snow in O'Leary?
January through April, October through December are months with snowfall in O'Leary, Iowa.
How many days does it snow in O'Leary?
In O'Leary, Iowa, during the entire year, snow falls for 39.2 days and aggregates up to 14.84" (377mm) of snow.
What is the month with the least sunshine in O'Leary?
The month with the least sunshine is January, with an average of 4.1h of sunshine.
What are the months with the lowest UV index in O'Leary?
The months with the lowest UV index in O'Leary are January, February, November and December, with an average maximum UV index of 2.
When does it snow the most in O'Leary?
February is the month with the most snowfall in O'Leary, Iowa. Snow falls for 8.3 days and accumulates 4.09" (104mm) of snow.
When is Daylight Saving Time (DST) in O'Leary?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in O'Leary, 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.
When it does not snow in O'Leary?
May through September are months without snowfall in O'Leary.
What is the rainiest month in O'Leary?
The month with the most rainfall in O'Leary is June, when the rain falls for 16.8 days and typically aggregates up to 3.35" (85mm) of precipitation.
When are the longest days in O'Leary?
The month with the longest days is June, with an average of 15h and 18min of daylight.
When is the highest UV index in O'Leary?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What month is the hottest in O'Leary?
July, with its average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 64°F (17.8°C), holds the record as the warmest month.
What month has the most sunshine in O'Leary?
The month with the most sunshine is July, with an average of 10.5h of sunshine.
What is the least humid month in O'Leary?
With an average relative humidity of 66%, October is the least humid month in O'Leary.
What is the month with the shortest days in O'Leary?
December has the shortest days of the year in O'Leary, Iowa, with an average of 9h and 6min of daylight.
Average temperature
O'Leary, 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 (24.8°F).
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (11.5°F).
Average pressure
O'Leary, 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:
29.95"Hg - Average pressure in September:
29.99"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.12"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
O'Leary, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.9mph - Average wind speed in April:
11.2mph - Average wind speed in May:
9.7mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
7.7mph - Average wind speed in August:
8mph - Average wind speed in September:
9.3mph - Average wind speed in October:
10.4mph - Average wind speed in November:
10.7mph - Average wind speed in December:
10.4mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity
O'Leary, IA
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (66%).
Average rainfall
O'Leary, IA
- Average rainfall in January:
0.63" - Average rainfall in February:
0.83" - Average rainfall in March:
1.57" - Average rainfall in April:
2.52" - Average rainfall in May:
3.11" - Average rainfall in June:
3.35"
- Average rainfall in July:
1.85" - Average rainfall in August:
2.2" - Average rainfall in September:
1.73" - Average rainfall in October:
1.89" - Average rainfall in November:
0.75" - Average rainfall in December:
1.02"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days
O'Leary, IA
- Average rainfall days in January:
3 days - Average rainfall days in February:
2.4 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
12.4 days - Average rainfall days in August:
13.3 days - Average rainfall days in September:
10.8 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
4.4 days - Average rainfall days in December:
3.4 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (2.4 days).
Average snowfall
O'Leary, IA
The month with the highest snowfall is February (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
O'Leary, IA
- Average snowfall days in January:
9.2 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
6.8 days - Average snowfall days in April:
1.9 days - Average snowfall days in May:
0.1 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:
1.6 days - Average snowfall days in November:
3 days - Average snowfall days in December:
8.3 days
The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
O'Leary, 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 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 5min - Average daylight in December:
9h and 1min
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 6min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
5h and 0min - 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:
9h and 4min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
O'Leary, IA
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
17.5 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
13.8 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
15.8 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
22.1 days - Average sunshine days in December:
20.6 days
The month with the most sunshine days is November (22.1 days).
The month with the least sunshine days is June (11.7 days).
Average UV index
O'Leary, 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, November and December (UV index 2).
Average cloud cover
O'Leary, 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
O'Leary, IA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
O'Leary, Iowa, USA
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