Climate and monthly weather forecast
Decatur, IN

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Weather in January

January, like December, is a freezing cold winter month in Decatur, Indiana, with temperature in the range of an average high of 31.3°F (-0.4°C) and an average low of 19.8°F (-6.8°C). January, with its average high-temperature of 31.3°F (-0.4°C) and an average low-temperature of 19.8°F (-6.8°C), holds the record as the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is a wintry month in Decatur, Indiana, with temperature in the range of an average low of 23.4°F (-4.8°C) and an average high of 35.2°F (1.8°C). Decatur's entry into February measures an average high-temperature of a cold 35.2°F (1.8°C), closely parallel to the preceding month. Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Decatur, Indiana, with an average temperature ranging between min 32.4°F (0.2°C) and max 46.9°F (8.3°C). March sees a temperature increase, moving from a cold 35.2°F (1.8°C) in February to a chilly 46.9°F (8.3°C). Weather in March »

Weather in April

April in Decatur, Indiana, is a moderate spring month, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 59°F (15°C). A shift in the average high-temperature is noticeable in April, changing from a frosty 46.9°F (8.3°C) in March to a refreshing 59°F (15°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Decatur, Indiana, with an average temperature fluctuating between 70.7°F (21.5°C) and 54°F (12.2°C). Decatur's transition into May brings a rise in the average high-temperature, moving from a refreshing 59°F (15°C) in April to a pleasant 70.7°F (21.5°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Decatur, Indiana, with temperature in the range of an average high of 78.1°F (25.6°C) and an average low of 61.3°F (16.3°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's pleasant 70.7°F (21.5°C) to a moderately hot 78.1°F (25.6°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Decatur, Indiana, with an average temperature fluctuating between 81.1°F (27.3°C) and 64°F (17.8°C). With average high temperatures of 81.1°F (27.3°C) and lows of 64°F (17.8°C), July is the warmest month. Throughout July, the heat index is evaluated at a hot 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Decatur, is another warm month, with temperature in the range of an average high of 79.2°F (26.2°C) and an average low of 61.7°F (16.5°C). Decatur, Indiana, experiences a recorded average high-temperature of a still moderately hot 79.2°F (26.2°C) in August, closely aligned with July's 81.1°F (27.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Decatur, Indiana, with an average temperature ranging between max 73.8°F (23.2°C) and min 55.8°F (13.2°C). The arrival of September correlates with a minor temperature reduction, down from August's 79.2°F (26.2°C) to a still moderately hot 73.8°F (23.2°C). Weather in September »

Weather in October

October, like September, in Decatur, Indiana, is another enjoyable autumn month, with temperature in the range of an average low of 45.9°F (7.7°C) and an average high of 61.7°F (16.5°C). During the transition into October, Decatur observes a decrease in the average high-temperature, falling from a moderately hot 73.8°F (23.2°C) in September to a refreshing 61.7°F (16.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Decatur, is another chilly month, with an average temperature fluctuating between 47.5°F (8.6°C) and 35.1°F (1.7°C). The arrival of November corresponds with a reduction in the average high-temperature, down from October's comfortable 61.7°F (16.5°C) to a frosty 47.5°F (8.6°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Decatur, Indiana, with temperature in the range of an average high of 36.7°F (2.6°C) and an average low of 27.1°F (-2.7°C). December brings a decrease in the average high-temperature, shifting from a frosty 47.5°F (8.6°C) in November to a wintry 36.7°F (2.6°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Decatur?

In Decatur, January records the average lowest temperatures, peaking at 31.3°F (-0.4°C) and reaching a low of 19.8°F (-6.8°C).

What are the most humid months in Decatur?

The months with the highest humidity in Decatur, Indiana, are January and February, with an average relative humidity of 83%.

How many days does it rain in Decatur?

In Decatur, Indiana, during the entire year, the rain falls for 159.4 days and collects up to 23.74" (603mm) of precipitation.

When does it snow in Decatur?

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

How much does it snow in Decatur?

Throughout the year, there are 48.4 snowfall days, and 10.47" (266mm) of snow is accumulated.

What is the month with the least sunshine in Decatur?

With an average of 3.5h of sunshine, January has the least sunshine of the year in Decatur.

What is the driest month in Decatur?

The month with the least rainfall in Decatur, Indiana, is February, when the rain falls for 7.5 days and typically collects 1.34" (34mm) of precipitation.

When does it snow the most in Decatur?

The month with the most snowfall is February, when snow falls for 12 days and typically aggregates up to 2.83" (72mm) of snow.

When is Daylight Saving Time (DST) in Decatur?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the rainiest month in Decatur?

The month with the most rainfall in Decatur is May, when the rain falls for 18.3 days and typically aggregates up to 3.03" (77mm) of precipitation.

When it does not snow in Decatur?

In Decatur, Indiana, snow does not fall in May through September.

When are the longest days in Decatur?

June has the longest days of the year in Decatur, Indiana, with an average of 15h and 6min of daylight.

When is the highest UV index in Decatur?

The months with the highest UV index in Decatur, Indiana, are June and July, with an average maximum UV index of 6.

What is the hottest time of year in Decatur?

July stands out as Decatur's warmest month, with temperatures ranging between an average high of 81.1°F (27.3°C) and a low of 64°F (17.8°C).

What month has the most sunshine in Decatur?

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

What is the least humid month in Decatur?

The least humid month in Decatur is October, with an average relative humidity of 74%.

What is the month with the shortest days in Decatur?

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

When is the lowest UV index in Decatur?

With an average maximum UV index of 1, December is the month with the lowest UV index in Decatur.

Average pressure
Decatur, IN

Average pressure - Decatur, IN

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Decatur, IN

Average wind speed - Decatur, IN

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity
Decatur, IN

Average humidity - Decatur, IN

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).

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Average rainfall
Decatur, IN

Average rainfall - Decatur, IN

The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.34").

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Average rainfall days
Decatur, IN

Average rainfall days - Decatur, IN

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (7.5 days).

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Average snowfall
Decatur, IN

Average snowfall - Decatur, IN

The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Decatur, IN

Average snowfall days - Decatur, IN

The month with the highest number of snowfall days is January (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Decatur, IN

Average daylight / Average sunshine - Decatur, IN

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: 3h and 30min).

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Average sunshine days
Decatur, IN

Average sunshine days - Decatur, IN

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10 days).

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Average visibility
Decatur, IN

Average visibility - Decatur, IN

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

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Decatur, Indiana, USA

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