Climate and monthly weather forecast
Iona, SD

Weather in January

January, like December, is another subzero cold winter month in Iona, South Dakota, with an average temperature fluctuating between 12.6°F (-10.8°C) and 26.1°F (-3.3°C). The coldest month is January, with an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 12.6°F (-10.8°C). Weather in January »

Weather in February

February, the last month of the winter in Iona, is also a subzero cold month, with an average temperature fluctuating between 15.3°F (-9.3°C) and 29.8°F (-1.2°C). In February, the average high-temperature is relatively the same as in January - a still subzero cold 29.8°F (-1.2°C). Weather in February »

Weather in March

March, the first month of the spring in Iona, is a chilly month, with temperature in the range of an average low of 29.1°F (-1.6°C) and an average high of 45°F (7.2°C). In March, the average high-temperature soars, from a subzero cold 29.8°F (-1.2°C) in February, to a frosty 45°F (7.2°C). Weather in March »

Weather in April

April in Iona, South Dakota, is a moderate spring month, with an average temperature varying between 56.3°F (13.5°C) and 38.3°F (3.5°C). In April, the average high-temperature rises from a frosty 45°F (7.2°C) in March to a mild 56.3°F (13.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Iona, South Dakota, with an average temperature ranging between max 67.8°F (19.9°C) and min 49.3°F (9.6°C). In Iona, South Dakota, the average high-temperature in May rises from a mild 56.3°F (13.5°C) in April to an enjoyable 67.8°F (19.9°C). Weather in May »

Weather in June

June, the first month of the summer in Iona, is a moderately hot month, with an average temperature fluctuating between 79.7°F (26.5°C) and 60.4°F (15.8°C). In June, the average high-temperature rises from a comfortable 67.8°F (19.9°C) in May to a warm 79.7°F (26.5°C). Weather in June »

Weather in July

July in Iona, South Dakota, is a hot summer month, with an average temperature varying between 66.2°F (19°C) and 88°F (31.1°C). With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 66.2°F (19°C), July is the warmest month. In July, the average heat index is estimated at a very hot 95°F (35°C). Weather in July »

Weather in August

August, the last month of the summer in Iona, is another warm month, with an average temperature fluctuating between 85.8°F (29.9°C) and 63.7°F (17.6°C). In Iona, the average high-temperature in August is practically the same as in July - a warm 85.8°F (29.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Iona, South Dakota, with an average temperature ranging between min 55.9°F (13.3°C) and max 76.3°F (24.6°C). In September, the average high-temperature drops from 85.8°F (29.9°C) in August to a still warm 76.3°F (24.6°C). Weather in September »

Weather in October

October, the same as September, in Iona, South Dakota, is another mild autumn month, with an average temperature varying between 42.4°F (5.8°C) and 58.6°F (14.8°C). In October, the average high-temperature plummets from a warm 76.3°F (24.6°C) in September to a mild 58.6°F (14.8°C). Weather in October »

Weather in November

November, the last month of the autumn in Iona, is another chilly month, with an average temperature ranging between max 45.5°F (7.5°C) and min 29.7°F (-1.3°C). In Iona, South Dakota, the average high-temperature in November drops from a moderate 58.6°F (14.8°C) in October to a frosty 45.5°F (7.5°C). Weather in November »

Weather in December

December, the first month of the winter in Iona, is also a subzero cold month, with an average temperature ranging between max 29.1°F (-1.6°C) and min 16.9°F (-8.4°C). In December, the average high-temperature plummets from a frosty 45.5°F (7.5°C) in November to a subzero cold 29.1°F (-1.6°C). Weather in December »
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FAQ

What is the coldest month in Iona?

With an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 12.6°F (-10.8°C), January is the coldest month.

What is the most humid month in Iona?

January is the most humid month in Iona, with an average relative humidity of 86%.

How much does it rain in Iona?

In Iona, during the entire year, the rain falls for 107.6 days and collects up to 17.83" (453mm) of precipitation.

When does it snow in Iona?

Months with snowfall in Iona, South Dakota, are January through April, October through December.

How much does it snow in Iona?

Throughout the year, in Iona, South Dakota, there are 50.9 snowfall days, and 17.87" (454mm) of snow is accumulated.

What is the month with the least sunshine in Iona?

January has the least sunshine of the year in Iona, with an average of 4.7h of sunshine.

What is the snowiest month in Iona?

February is the month with the most snowfall in Iona, South Dakota. Snow falls for 11.7 days and accumulates 3.66" (93mm) of snow.

What is the month with the lowest UV index in Iona?

With an average maximum UV index of 1, February is the month with the lowest UV index in Iona, South Dakota.

When is Daylight Saving Time (DST) in Iona?

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.

When it does not snow in Iona?

In Iona, South Dakota, snow does not fall in May through September.

What is the rainiest month in Iona?

June is the month with the most rainfall. Rain falls for 14.6 days and accumulates 3.03" (77mm) of precipitation.

When are the longest days in Iona?

With an average of 15h and 22min of daylight, June has the longest days of the year.

What is the month with the highest UV index in Iona?

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

What is the warmest month in Iona?

With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 66.2°F (19°C), July is the warmest month in Iona.

What month has the most sunshine in Iona?

With an average of 11.4h of sunshine, July has the most sunshine of the year in Iona.

What is the least humid month in Iona?

With an average relative humidity of 58%, September is the least humid month.

What is the driest month in Iona?

The month with the least rainfall is November, when the rain falls for 4.1 days and typically collects 0.55" (14mm) of precipitation.

What is the month with the shortest days in Iona?

With an average of 9h and 1min of daylight, December has the shortest days of the year in Iona.

Average pressure
Iona, SD

Average pressure - Iona, SD

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed
Iona, SD

Average wind speed - Iona, SD

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (9.1mph).

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Average rainfall
Iona, SD

Average rainfall - Iona, SD

The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is November (0.55").

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Average rainfall days
Iona, SD

Average rainfall days - Iona, SD

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.3 days).

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Average snowfall
Iona, SD

Average snowfall - Iona, SD

The month with the highest snowfall is February (3.66").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Iona, SD

Average snowfall days - Iona, SD

The months with the highest number of snowfall days are January and February (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Iona, SD

Average daylight / Average sunshine - Iona, SD

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days
Iona, SD

Average sunshine days - Iona, SD

The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is April (11.8 days).

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Average visibility
Iona, SD

Average visibility - Iona, SD

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

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