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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 Duncan, Iowa, is a freezing cold winter month, with an average temperature fluctuating between 10.4°F (-12°C) and 22.8°F (-5.1°C). The month of January sees the lowest average temperatures, reaching 22.8°F (-5.1°C) at the peak and 10.4°F (-12°C) at the low. Weather in January »
Weather in February
February, the last month of the winter in Duncan, is also a subzero cold month, with temperature in the range of an average low of 13.6°F (-10.2°C) and an average high of 26.4°F (-3.1°C). Duncan's weather in February displays an average high-temperature of a still subzero cold 26.4°F (-3.1°C), showing minor disparity from January's 22.8°F (-5.1°C). Weather in February »
Weather in March
March, the first month of the spring in Duncan, is a wintry month, with an average temperature varying between 42.1°F (5.6°C) and 28.2°F (-2.1°C). A notable increase in the average high-temperature is observed during March, soaring from a freezing cold 26.4°F (-3.1°C) in February to a cold 42.1°F (5.6°C). Weather in March »
Weather in April
April is a mild spring month in Duncan, Iowa, with an average temperature varying between 39.9°F (4.4°C) and 55.8°F (13.2°C). April's arrival coincides with a rise in the average high-temperature, moving from March's cold 42.1°F (5.6°C) to a moderate 55.8°F (13.2°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Duncan, Iowa, with an average temperature fluctuating between 51.8°F (11°C) and 68°F (20°C). May marks a rise in the average high-temperature, moving from April's mild 55.8°F (13.2°C) to a pleasant 68°F (20°C). Weather in May »
Weather in June
June, the first month of the summer in Duncan, is a warm month, with temperature in the range of an average high of 77.5°F (25.3°C) and an average low of 61.3°F (16.3°C). June witnesses an increase in the average high-temperature, moving from a pleasant 68°F (20°C) in May to a moderately hot 77.5°F (25.3°C). Weather in June »
Weather in July
July, like June, in Duncan, Iowa, is another warm summer month, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 79.7°F (26.5°C). Duncan's warmest weather arrives in July, when temperatures average a high of 79.7°F (26.5°C) and a low of 63°F (17.2°C). Weather in July »
Weather in August
August, the last month of the summer in Duncan, is another warm month, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 60.3°F (15.7°C). In the transition from July to August, Duncan reports an average high-temperature of a still warm 77.9°F (25.5°C), indicating a close resemblance to the prior month. Weather in August »
Weather in September
September, the first month of the autumn in Duncan, is also an agreeable month, with an average temperature fluctuating between 54°F (12.2°C) and 72.7°F (22.6°C). The arrival of September brings an average high-temperature of an agreeable 72.7°F (22.6°C), subtly diverging from August's 77.9°F (25.5°C). Weather in September »
Weather in October
October, like September, is another mild autumn month in Duncan, Iowa, with an average temperature ranging between max 57.7°F (14.3°C) and min 42.6°F (5.9°C). October is marked by a distinct decrease in the average high-temperature, falling from an agreeable 72.7°F (22.6°C) in September to a refreshing 57.7°F (14.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Duncan, Iowa, with an average temperature varying between 42.8°F (6°C) and 30.4°F (-0.9°C). A shift in Duncan's weather is noticeable as October turns into November, with the average high temperature decreasing from a moderate 57.7°F (14.3°C) to a chilly 42.8°F (6°C). Weather in November »
Weather in December
December, the first month of the winter in Duncan, is also a subzero cold month, with an average temperature varying between 17.8°F (-7.9°C) and 28.2°F (-2.1°C). As December arrives, a noticeable drop in the average high-temperature is witnessed, moving from a chilly 42.8°F (6°C) in November to a freezing cold 28.2°F (-2.1°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Duncan?
Temperature records mark January as the coldest month, with highs averaging 22.8°F (-5.1°C) and lows at 10.4°F (-12°C).
What is the most humid month in Duncan?
The most humid month in Duncan is January, with an average relative humidity of 89%.
What is the driest month in Duncan?
The month with the least rainfall in Duncan is January, when the rain falls for 4.3 days and typically collects 0.94" (24mm) of precipitation.
How much does it rain in Duncan?
Throughout the year, in Duncan, there are 127.1 rainfall days, and 24.8" (630mm) of precipitation is accumulated.
When does it snow in Duncan?
January through May, October through December are months with snowfall.
How much does it snow in Duncan?
In Duncan, Iowa, during the entire year, snow falls for 51.2 days and aggregates up to 20.91" (531mm) of snow.
What is the month with the least sunshine in Duncan?
With an average of 3.7h of sunshine, January has the least sunshine of the year in Duncan.
What are the months with the lowest UV index in Duncan?
The months with the lowest UV index in Duncan are January and December, with an average maximum UV index of 1.
When does it snow the most in Duncan?
The month with the most snowfall is February, when snow falls for 10.4 days and typically aggregates up to 5.71" (145mm) of snow.
When is Daylight Saving Time (DST) in Duncan?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Duncan, 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 Duncan?
June is the month with the most rainfall in Duncan, Iowa. Rain falls for 17.8 days and accumulates 3.82" (97mm) of precipitation.
When it does not snow in Duncan?
June through September are months without snowfall in Duncan, Iowa.
When are the longest days in Duncan?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What is the month with the highest UV index in Duncan?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What month is the hottest in Duncan?
July is the warmest month in Duncan, with the temperature often reaching an average high of 79.7°F (26.5°C) and an average low of 63°F (17.2°C).
What month has the most sunshine in Duncan?
July has the most sunshine of the year, with an average of 9.8h of sunshine.
What is the least humid month in Duncan?
The least humid month is October, with an average relative humidity of 69%.
What is the month with the shortest days in Duncan?
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Duncan, IA
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (22.8°F).
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (10.4°F).
Average pressure
Duncan, IA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Duncan, IA
- Average wind speed in January:
10.9mph - Average wind speed in February:
10.8mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11mph - Average wind speed in May:
9.6mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
7.4mph - Average wind speed in August:
7.5mph - Average wind speed in September:
8.6mph - Average wind speed in October:
10.1mph - Average wind speed in November:
10.7mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity
Duncan, IA
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (69%).
Average rainfall
Duncan, IA
- Average rainfall in January:
0.94" - Average rainfall in February:
1.22" - Average rainfall in March:
1.54" - Average rainfall in April:
2.76" - Average rainfall in May:
3.15" - Average rainfall in June:
3.82"
The wettest month (with the highest rainfall) is June (3.82").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days
Duncan, IA
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
2.8 days - Average rainfall days in March:
9.6 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
16 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
5.5 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (2.8 days).
Average snowfall
Duncan, IA
- Average snowfall in January:
4.72" - Average snowfall in February:
5.71" - Average snowfall in March:
3.03" - Average snowfall in April:
1.77" - Average snowfall in May:
0.35" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Duncan, IA
- Average snowfall days in January:
13.3 days - Average snowfall days in February:
10.4 days - Average snowfall days in March:
7.1 days - Average snowfall days in April:
2.6 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:
4.8 days - Average snowfall days in December:
11.2 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Duncan, IA
- Average daylight in January:
9h and 2min - 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 4min - 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:
3h and 4min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - 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 0min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Duncan, IA
- Average sunshine days in January:
16.4 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
13.5 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
16.8 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
18.3 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is June (10.4 days).
Average UV index
Duncan, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Duncan, IA
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility
Duncan, 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).
Duncan, Iowa, USA
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