Climate and monthly weather forecast
Delta, IA

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Weather in January

January, the same as December, in Delta, Iowa, is another subzero cold winter month, with temperature in the range of an average high of 28.6°F and an average low of 15.6°F. Delta's temperature records reveal January as the coldest month, marked by average highs of 28.6°F and lows of 15.6°F. Weather in January »

Weather in February

The last month of the winter, February, is an icy month in Delta, Iowa, with temperature in the range of an average high of 32.5°F and an average low of 19°F. The onset of February notes an average high-temperature of a wintry 32.5°F, subtly shifted from January's 28.6°F. Weather in February »

Weather in March

March, the first month of the spring in Delta, is a frosty month, with an average temperature fluctuating between 47.1°F and 32.4°F. Delta's transition into March marks a considerable rise in the average high-temperature, moving up from an icy 32.5°F in February to a frosty 47.1°F. Weather in March »

Weather in April

April is a refreshing spring month in Delta, Iowa, with an average temperature varying between 59.5°F and 42.4°F. April comes with an increase, with the average high-temperature moving from a frosty 47.1°F in March to a refreshing 59.5°F. Weather in April »

Weather in May

May, the last month of the spring in Delta, is an agreeable month, with an average temperature ranging between max 70°F and min 53.2°F. Delta sees an increase in average high-temperatures during May, moving from a mild 59.5°F in April to an agreeable 70°F. Weather in May »

Weather in June

June, the first month of the summer in Delta, is a warm month, with an average temperature ranging between max 79.3°F and min 63.1°F. With the transition into June, Delta experiences an increase in average high-temperatures, moving up from a pleasant 70°F in May to a warm 79.3°F. Weather in June »

Weather in July

July, the same as June, is another warm summer month in Delta, Iowa, with an average temperature varying between 65.1°F and 82°F. In Delta, July is identified by the highest average temperatures, reaching a peak of 82°F and a low of 65.1°F. The average heat index in July is evaluated at a tropical 89.6°F. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Delta, Iowa, with an average temperature varying between 81.1°F and 62.8°F. Delta measures an average high-temperature of a still warm 81.1°F in August, nearly consistent with the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Delta, is still a warm month, with an average temperature varying between 56.3°F and 75.2°F. Transition into September subtly marks a drop in the average high-temperature, moderately moving from a warm 81.1°F in August to a still moderately hot 75.2°F. Weather in September »

Weather in October

October, like September, in Delta, Iowa, is another refreshing autumn month, with an average temperature ranging between max 61.3°F and min 44.8°F. October's arrival coincides with a drop in the average high-temperature, decreasing from September's warm 75.2°F to a comfortable 61.3°F. Weather in October »

Weather in November

November, the last month of the autumn in Delta, is another chilly month, with an average temperature fluctuating between 46.9°F and 33.4°F. With the onset of November, Delta's average high-temperature witnesses a clear drop, receding from October's enjoyable 61.3°F to a chilly 46.9°F. Weather in November »

Weather in December

December, the first month of the winter in Delta, is also an icy month, with an average temperature fluctuating between 34.7°F and 23.4°F. The shift from November to December involves a decrease in the average high-temperature, from a chilly 46.9°F to a wintry 34.7°F. Weather in December »
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Frequently asked questions

What month is the coldest in Delta?

Temperature records in Delta mark January as the coldest month, with highs averaging 28.6°F and lows at 15.6°F.

How many days does it rain in Delta?

In Delta, Iowa, during the entire year, the rain falls for 137.9 days and collects up to 27.76" of precipitation.

When does it snow in Delta?

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

What is the snowiest month in Delta?

The month with the most snowfall in Delta, Iowa, is January, when snow falls for 9.5 days and typically aggregates up to 4.06" of snow.

How much does it snow in Delta?

Throughout the year, there are 32.8 snowfall days, and 12.56" of snow is accumulated.

What is the month with the least sunshine in Delta?

The month with the least sunshine is January, with an average of 4.2h of sunshine.

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

The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.

What is the driest month in Delta?

February is the month with the least rainfall in Delta. Rain falls for 4.9 days and accumulates 0.98" of precipitation.

When is Daylight Saving Time (DST) in Delta?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the rainiest month in Delta?

The month with the most rainfall in Delta is May, when the rain falls for 17.7 days and typically aggregates up to 4.17" of precipitation.

When it does not snow in Delta?

June through September are months without snowfall.

When are the longest days in Delta?

The month with the longest days in Delta, Iowa, is June, with an average of 15h and 6min of daylight.

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

June and July, with an average maximum UV index of 6, are months with the highest UV index in Delta, Iowa.

What is the warmest month in Delta?

The warmest period in Delta tends to be July, when average temperatures fluctuate between a high of 82°F and a low of 65.1°F.

What is the most humid month in Delta?

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

What month has the most sunshine in Delta?

July has the most sunshine of the year in Delta, with an average of 10.3h of sunshine.

What is the least humid month in Delta?

The least humid month in Delta, Iowa, is October, with an average relative humidity of 72%.

What is the month with the shortest days in Delta?

December has the shortest days of the year in Delta, with an average of 9h and 18min of daylight.

Average pressure
Delta, IA

Average pressure - Delta, IA

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed
Delta, IA

Average wind speed - Delta, IA

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

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Average rainfall
Delta, IA

Average rainfall - Delta, IA

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (0.98").

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Average rainfall days
Delta, IA

Average rainfall days - Delta, IA

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.9 days).

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Average snowfall
Delta, IA

Average snowfall - Delta, IA

The month with the highest snowfall is January (4.06").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Delta, IA

Average snowfall days - Delta, IA

The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Delta, IA

Average daylight / Average sunshine - Delta, IA

The month with the longest days is June (Average daylight: 15h and 6min).
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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days
Delta, IA

Average sunshine days - Delta, IA

The month with the most sunshine days is December (19.1 days).
The month with the least sunshine days is June (10.3 days).

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Average UV index
Delta, IA

Average UV index - Delta, 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, October, November and December (UV index 2).

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Average visibility
Delta, IA

Average visibility - Delta, IA

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

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Delta, Iowa, USA

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