Climate and monthly weather forecast
Decorah, IA

Weather in January

January, the same as December, in Decorah, Iowa, is another subzero cold winter month, with an average temperature varying between 9.7°F (-12.4°C) and 22.3°F (-5.4°C). The coldest month is January, with an average high-temperature of 22.3°F (-5.4°C) and an average low-temperature of 9.7°F (-12.4°C). Weather in January »

Weather in February

February, the last month of the winter in Decorah, is another freezing cold month, with temperature in the range of an average low of 12.7°F (-10.7°C) and an average high of 26.1°F (-3.3°C). In February, the average high-temperature is almost the same as in January - a still freezing cold 26.1°F (-3.3°C). Weather in February »

Weather in March

March, the first month of the spring in Decorah, is a wintry month, with temperature in the range of an average high of 41°F (5°C) and an average low of 26.8°F (-2.9°C). In Decorah, the average high-temperature in March increases considerably from a freezing cold 26.1°F (-3.3°C) in February to a cold 41°F (5°C). Weather in March »

Weather in April

April in Decorah, Iowa, is a cool spring month, with an average temperature fluctuating between 54°F (12.2°C) and 37.4°F (3°C). In Decorah, the average high-temperature in April increases from a cold 41°F (5°C) in March to a cool 54°F (12.2°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Decorah, Iowa, with temperature in the range of an average high of 65.7°F (18.7°C) and an average low of 48.7°F (9.3°C). In May, the average high-temperature rises from a cool 54°F (12.2°C) in April to an enjoyable 65.7°F (18.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Decorah, Iowa, with an average temperature ranging between max 75°F (23.9°C) and min 58.6°F (14.8°C). In Decorah, the average high-temperature in June rises from a comfortable 65.7°F (18.7°C) in May to a warm 75°F (23.9°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Decorah, Iowa, with an average temperature fluctuating between 78.4°F (25.8°C) and 61.9°F (16.6°C). The warmest month is July, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 61.9°F (16.6°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Decorah, Iowa, with an average temperature ranging between max 77.2°F (25.1°C) and min 59.4°F (15.2°C). In Decorah, the average high-temperature in August is relatively the same as in July - a still warm 77.2°F (25.1°C). Weather in August »

Weather in September

September, the first month of the autumn in Decorah, is also an agreeable month, with an average temperature ranging between max 70.7°F (21.5°C) and min 52°F (11.1°C). In September, the average high-temperature slightly decreases from a moderately hot 77.2°F (25.1°C) in August to a pleasant 70.7°F (21.5°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Decorah, Iowa, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 41.2°F (5.1°C). In Decorah, the average high-temperature in October declines considerably from an agreeable 70.7°F (21.5°C) in September to a mild 56.3°F (13.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Decorah, is also a wintry month, with an average temperature fluctuating between 29.3°F (-1.5°C) and 41.9°F (5.5°C). In Decorah, Iowa, the average high-temperature in November plummets from a mild 56.3°F (13.5°C) in October to a cold 41.9°F (5.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Decorah, Iowa, with an average temperature fluctuating between 18.3°F (-7.6°C) and 28.4°F (-2°C). In December, the average high-temperature decreases from a cold 41.9°F (5.5°C) in November to a freezing cold 28.4°F (-2°C). Weather in December »
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FAQ

What is the coldest month in Decorah?

The coldest month in Decorah is January, with an average high-temperature of 22.3°F (-5.4°C) and an average low-temperature of 9.7°F (-12.4°C).

What are the most humid months in Decorah?

January and February, with an average relative humidity of 89%, are most humid months in Decorah.

What is the driest month in Decorah?

January is the month with the least rainfall in Decorah. Rain falls for 4.5 days and accumulates 1.1" (28mm) of precipitation.

How many days does it rain in Decorah?

In Decorah, Iowa, during the entire year, the rain falls for 149 days and collects up to 30.59" (777mm) of precipitation.

When does it snow in Decorah?

Months with snowfall are January through May, October through December.

How much does it snow in Decorah?

Throughout the year, there are 60.9 snowfall days, and 24.37" (619mm) of snow is accumulated.

What is the month with the least sunshine in Decorah?

January has the least sunshine of the year, with an average of 3.5h of sunshine.

When is the lowest UV index in Decorah?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Decorah.

What is the snowiest month in Decorah?

The month with the most snowfall in Decorah, Iowa, is February, when snow falls for 12.8 days and typically aggregates up to 5.98" (152mm) of snow.

When is Daylight Saving Time (DST) in Decorah?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

What are the months with the highest UV index in Decorah?

The months with the highest UV index are May through August, with an average maximum UV index of 5.

What is the rainiest month in Decorah?

June is the month with the most rainfall in Decorah, Iowa. Rain falls for 20.3 days and accumulates 5.04" (128mm) of precipitation.

When it does not snow in Decorah?

June through September are months without snowfall in Decorah.

When are the longest days in Decorah?

With an average of 15h and 20min of daylight, June has the longest days of the year.

What is the warmest month in Decorah?

July is the warmest month in Decorah, with an average high-temperature of 78.4°F (25.8°C) and an average low-temperature of 61.9°F (16.6°C).

What month has the most sunshine in Decorah?

The month with the most sunshine in Decorah, Iowa, is August, with an average of 9.8h of sunshine.

What is the least humid month in Decorah?

With an average relative humidity of 76%, October is the least humid month.

What is the month with the shortest days in Decorah?

December has the shortest days of the year in Decorah, with an average of 9h and 2min of daylight.

Average pressure
Decorah, IA

Average pressure - Decorah, IA

The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed
Decorah, IA

Average wind speed - Decorah, IA

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity
Decorah, IA

Average humidity - Decorah, IA

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).

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Average rainfall
Decorah, IA

Average rainfall - Decorah, IA

The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days
Decorah, IA

Average rainfall days - Decorah, IA

The months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall
Decorah, IA

Average snowfall - Decorah, IA

The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Decorah, IA

Average snowfall days - Decorah, IA

The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Decorah, IA

Average daylight / Average sunshine - Decorah, IA

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 2min).

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days
Decorah, IA

Average sunshine days - Decorah, IA

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).

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Average UV index
Decorah, IA

Average UV index - Decorah, IA

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average visibility
Decorah, IA

Average visibility - Decorah, IA

The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).

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