Climate and monthly weather forecast
Mattoon, IL

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Weather in January

January, like December, in Mattoon, Illinois, is another cold winter month, with an average temperature ranging between min 21.9°F (-5.6°C) and max 34°F (1.1°C). In Mattoon, January is the coldest month, with temperatures averaging a high of 34°F (1.1°C) and a low of 21.9°F (-5.6°C). Weather in January »

Weather in February

The last month of the winter, February, is another cold month in Mattoon, Illinois, with an average temperature fluctuating between 26.1°F (-3.3°C) and 39°F (3.9°C). The commencement of February records an average high-temperature of a still wintry 39°F (3.9°C), barely varying from January's 34°F (1.1°C). Weather in February »

Weather in March

The first month of the spring, March, is a fresh month in Mattoon, Illinois, with an average temperature fluctuating between 36.1°F (2.3°C) and 51.1°F (10.6°C). As Mattoon transitions into March, the average high-temperature is observed to rise from a cold 39°F (3.9°C) in February to a fresh 51.1°F (10.6°C). Weather in March »

Weather in April

April is a comfortable spring month in Mattoon, Illinois, with temperature in the range of an average high of 62.2°F (16.8°C) and an average low of 46.2°F (7.9°C). The shift into April is accompanied by a temperature increase, with the average high-temperature rising from a cool 51.1°F (10.6°C) in March to a refreshing 62.2°F (16.8°C). Weather in April »

Weather in May

May, the last month of the spring in Mattoon, is a pleasant month, with an average temperature ranging between min 56.7°F (13.7°C) and max 73°F (22.8°C). The shift into May is marked by a rise in the average high-temperature, moving from April's refreshing 62.2°F (16.8°C) to an agreeable 73°F (22.8°C). Weather in May »

Weather in June

June, the first month of the summer in Mattoon, is a moderately hot month, with an average temperature varying between 81.1°F (27.3°C) and 64.2°F (17.9°C). The shift from May to June sees a slight increase in the average high-temperature, transitioning from an agreeable 73°F (22.8°C) to a warm 81.1°F (27.3°C). Weather in June »

Weather in July

July, like June, in Mattoon, Illinois, is a moderately hot summer month, with an average temperature ranging between max 82°F (27.8°C) and min 65.8°F (18.8°C). Mattoon experiences its highest temperatures in July, with an average peak of 82°F (27.8°C) and a low of 65.8°F (18.8°C). July's heat index is appraised at a tropical 89.6°F (32°C). Weather in July »

Weather in August

August, the last month of the summer in Mattoon, is another warm month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64°F (17.8°C). As July transitions into August, the average high-temperature rests at a still moderately hot 81.1°F (27.3°C), maintaining a close resemblance to the previous month. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Mattoon, Illinois, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 58.5°F (14.7°C). Mattoon experiences an average high-temperature of a still warm 77.2°F (25.1°C) in September, marking an insignificant shift from 81.1°F (27.3°C) in August. Weather in September »

Weather in October

October, like September, in Mattoon, Illinois, is another enjoyable autumn month, with temperature in the range of an average low of 48.2°F (9°C) and an average high of 63.9°F (17.7°C). In Mattoon, the beginning of October is marked by a lowered average high-temperature, shifting from September's moderately hot 77.2°F (25.1°C) to an enjoyable 63.9°F (17.7°C). Weather in October »

Weather in November

November, the last month of the autumn in Mattoon, is another chilly month, with temperature in the range of an average low of 36.1°F (2.3°C) and an average high of 49.8°F (9.9°C). Setting in of November comes with a decrease in the average high-temperature, moving from a comfortable 63.9°F (17.7°C) in October to a chilly 49.8°F (9.9°C). Weather in November »

Weather in December

December, the first month of the winter in Mattoon, is also a wintry month, with temperature in the range of an average low of 28.8°F (-1.8°C) and an average high of 39°F (3.9°C). In December, the average high-temperature goes from a chilly 49.8°F (9.9°C) in November to a wintry 39°F (3.9°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Mattoon?

January is Mattoon's coldest month, registering average high temperatures of 34°F (1.1°C) and lows of 21.9°F (-5.6°C).

How much does it rain in Mattoon?

In Mattoon, Illinois, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.

When does it snow in Mattoon?

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

How much does it snow in Mattoon?

Throughout the year, there are 26.6 snowfall days, and 7.01" (178mm) of snow is accumulated.

What is the month with the least sunshine in Mattoon?

January has the least sunshine of the year, with an average of 4h of sunshine.

What is the driest month in Mattoon?

February is the month with the least rainfall in Mattoon. Rain falls for 7.8 days and accumulates 1.3" (33mm) of precipitation.

When is Daylight Saving Time (DST) in Mattoon?

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 wettest month in Mattoon?

April is the month with the most rainfall in Mattoon, Illinois. Rain falls for 14.9 days and accumulates 3.31" (84mm) of precipitation.

When it does not snow in Mattoon?

May through September are months without snowfall in Mattoon, Illinois.

When are the longest days in Mattoon?

The month with the longest days is June, with an average of 14h and 54min of daylight.

What month has the most sunshine in Mattoon?

June has the most sunshine of the year, with an average of 10.3h of sunshine.

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

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

What month is the hottest in Mattoon?

July, recording an average high temperature of 82°F (27.8°C) and a low temperature of 65.8°F (18.8°C), is Mattoon's warmest month.

What is the most humid month in Mattoon?

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

What is the least humid month in Mattoon?

The least humid month is October, with an average relative humidity of 70%.

When does it snow the most in Mattoon?

The month with the most snowfall is December, when snow falls for 6 days and typically aggregates up to 2.13" (54mm) of snow.

What is the month with the shortest days in Mattoon?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

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

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

Average pressure
Mattoon, IL

Average pressure - Mattoon, IL

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Mattoon, IL

Average wind speed - Mattoon, IL

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).

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Average rainfall
Mattoon, IL

Average rainfall - Mattoon, IL

The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").

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Average rainfall days
Mattoon, IL

Average rainfall days - Mattoon, IL

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall
Mattoon, IL

Average snowfall - Mattoon, IL

The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Mattoon, IL

Average snowfall days - Mattoon, IL

The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Mattoon, IL

Average daylight / Average sunshine - Mattoon, IL

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days
Mattoon, IL

Average sunshine days - Mattoon, IL

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).

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Average visibility
Mattoon, IL

Average visibility - Mattoon, IL

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

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Mattoon, Illinois, USA

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