Climate and monthly weather forecast
Decatur City, IA

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Weather in January

January, like December, is another subzero cold winter month in Decatur City, Iowa, with temperature in the range of an average high of 30.6°F (-0.8°C) and an average low of 16.9°F (-8.4°C). January is the coldest month of the year, registering average temperatures as high as 30.6°F (-0.8°C) and as low as 16.9°F (-8.4°C). Weather in January »

Weather in February

The last month of the winter, February, is a wintry month in Decatur City, Iowa, with an average temperature varying between 34.3°F (1.3°C) and 19.8°F (-6.8°C). February's arrival brings an average high-temperature of an icy 34.3°F (1.3°C), slightly deviating from January's 30.6°F (-0.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Decatur City, Iowa, with an average temperature fluctuating between 48.9°F (9.4°C) and 33.4°F (0.8°C). Decatur City's transition into March is marked by a distinct rise in the average high-temperature, advancing from an icy 34.3°F (1.3°C) in February to a frosty 48.9°F (9.4°C). Weather in March »

Weather in April

April in Decatur City, Iowa, is a moderate spring month, with an average temperature fluctuating between 43°F (6.1°C) and 60.4°F (15.8°C). The beginning of April signals a rise in the average high-temperature, moving from a chilly 48.9°F (9.4°C) in March to a refreshing 60.4°F (15.8°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Decatur City, Iowa, with an average temperature fluctuating between 69.4°F (20.8°C) and 53.1°F (11.7°C). As Decatur City welcomes May, the average high-temperature sees a rise, transitioning from a moderate 60.4°F (15.8°C) in April to a pleasant 69.4°F (20.8°C). Weather in May »

Weather in June

June, the first month of the summer in Decatur City, is a warm month, with an average temperature fluctuating between 79.9°F (26.6°C) and 63.1°F (17.3°C). A rise in the average high-temperature is observed during June, moving from an agreeable 69.4°F (20.8°C) in May to a moderately hot 79.9°F (26.6°C). Weather in June »

Weather in July

July, like June, in Decatur City, Iowa, is another warm summer month, with an average temperature ranging between min 66°F (18.9°C) and max 83.5°F (28.6°C). Decatur City experiences its highest average temperatures in July, reaching a peak of 83.5°F (28.6°C) and a minimum of 66°F (18.9°C). For July, the heat index is calculated to be a tropical 93.2°F (34°C). Weather in July »

Weather in August

August, the last month of the summer in Decatur City, is another warm month, with an average temperature varying between 63.5°F (17.5°C) and 81.9°F (27.7°C). The advent of August reveals an average high-temperature of a still warm 81.9°F (27.7°C), showing minimal difference from the prior month. Weather in August »

Weather in September

September, the first month of the autumn in Decatur City, is also a moderately hot month, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 76.1°F (24.5°C). September marks a gentle change in average high-temperature, declining from August's 81.9°F (27.7°C) to a still moderately hot 76.1°F (24.5°C). Weather in September »

Weather in October

October, like September, in Decatur City, Iowa, is another refreshing autumn month, with an average temperature ranging between min 44.4°F (6.9°C) and max 61.7°F (16.5°C). The beginning of October signals a clear reduction in the average high-temperature, falling from a warm 76.1°F (24.5°C) in September to a refreshing 61.7°F (16.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Decatur City, Iowa, with temperature in the range of an average low of 33.1°F (0.6°C) and an average high of 48.6°F (9.2°C). The commencement of November indicates a shift in the average high-temperature, receding from October's comfortable 61.7°F (16.5°C) to a chilly 48.6°F (9.2°C). Weather in November »

Weather in December

December, the first month of the winter in Decatur City, is still a cold month, with an average temperature ranging between min 23.4°F (-4.8°C) and max 35.6°F (2°C). The transition into December involves a decrease in the average high-temperature, falling from a chilly 48.6°F (9.2°C) in November to an icy 35.6°F (2°C). Weather in December »
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

Decatur City witnesses the coldest weather in January, with temperatures averaging a high of 30.6°F (-0.8°C) and a low of 16.9°F (-8.4°C).

What is the driest month?

January and December are months with the least rain when the rain falls for 4.8 days and typically aggregates up to 0.67" (17mm) of rain.

How much does it rain?

In Decatur City, during the entire year, the rain falls for 132.4 days and collects up to 20.24" (514mm) of precipitation.

When does it snow?

Months with snowfall in Decatur City are January through May, October through December.

When does it snow the most?

The month with the most snowfall is January, when snow falls for 8.6 days and typically aggregates up to 2.72" (69mm) of snow.

How many days does it snow?

In Decatur City, during the entire year, snow falls for 30.2 days and aggregates up to 10.16" (258mm) of snow.

What is the month with the least sunshine?

With an average of 4.4h of sunshine, January has the least sunshine of the year.

When is the lowest UV index?

The month with the lowest UV index is January, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Decatur City?

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 most humid month in Decatur City?

With an average relative humidity of 83%, June is the most humid month.

What is the wettest month in Decatur City?

The month with the most rainfall in Decatur City is June, when the rain falls for 17.3 days and typically aggregates up to 3.43" (87mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

When are the longest days?

With an average of 15h and 0min of daylight, June has the longest days of the year.

What are the months with the highest UV index in Decatur City?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What month is the hottest?

July is the warmest month, exhibiting average temperatures of 83.5°F (28.6°C) at the peak and 66°F (18.9°C) at the base.

What month has the most sunshine?

July has the most sunshine of the year, with an average of 10.4h of sunshine.

What is the least humid month?

October is the least humid month, with an average relative humidity of 72%.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

Average temperature
Decatur City, IA

Average temperature - Decatur City, IA

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure
Decatur City, IA

Average pressure - Decatur City, IA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed
Decatur City, IA

Average wind speed - Decatur City, IA

The windiest months (with the highest average wind speed) are January, February and March (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

Average humidity
Decatur City, IA

Average humidity - Decatur City, IA

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

Average rainfall
Decatur City, IA

Average rainfall - Decatur City, IA

The wettest month (with the highest rainfall) is June (3.43").
The driest months (with the least rainfall) are January and December (0.67").

Average rainfall days
Decatur City, IA

Average rainfall days - Decatur City, IA

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is January (4.8 days).

Average snowfall
Decatur City, IA

Average snowfall - Decatur City, IA

The month with the highest snowfall is January (2.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Decatur City, IA

Average snowfall days - Decatur City, IA

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Decatur City, IA

Average daylight / Average sunshine - Decatur City, IA

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days
Decatur City, IA

Average sunshine days - Decatur City, IA

The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is June (8.9 days).

Average visibility
Decatur City, IA

Average visibility - Decatur City, 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).

Decatur City, Iowa, USA

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