Climate and monthly weather forecast
Mason, IL

Weather in January

January, the same as December, is another cold winter month in Mason, Illinois, with temperature in the range of an average low of 23.4°F (-4.8°C) and an average high of 35.6°F (2°C). The coldest month is January, with an average high-temperature of 35.6°F (2°C) and an average low-temperature of 23.4°F (-4.8°C). Weather in January »

Weather in February

February, the last month of the winter in Mason, is another cold month, with an average temperature varying between 40.3°F (4.6°C) and 26.6°F (-3°C). In February, the average high-temperature is essentially the same as in January - a still cold 40.3°F (4.6°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Mason, Illinois, with an average temperature ranging between max 52.2°F (11.2°C) and min 36.9°F (2.7°C). In March, the average high-temperature increases from a wintry 40.3°F (4.6°C) in February to a cool 52.2°F (11.2°C). Weather in March »

Weather in April

April in Mason, Illinois, is an enjoyable spring month, with an average temperature ranging between max 63.5°F (17.5°C) and min 46.6°F (8.1°C). In April, the average high-temperature rises from a fresh 52.2°F (11.2°C) in March to a comfortable 63.5°F (17.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in Mason, Illinois, with temperature in the range of an average high of 73.6°F (23.1°C) and an average low of 56.8°F (13.8°C). In May, the average high-temperature rises from a comfortable 63.5°F (17.5°C) in April to a warm 73.6°F (23.1°C). Weather in May »

Weather in June

The first month of the summer, June, is still a warm month in Mason, Illinois, with an average temperature ranging between min 65.5°F (18.6°C) and max 81.7°F (27.6°C). In Mason, the average high-temperature in June slightly increases from 73.6°F (23.1°C) in May to a still warm 81.7°F (27.6°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Mason, Illinois, with an average temperature ranging between max 83.7°F (28.7°C) and min 67.1°F (19.5°C). July is the warmest month, with an average high-temperature of 83.7°F (28.7°C) and an average low-temperature of 67.1°F (19.5°C). In July, the average heat index is appraised at a tropical 93.2°F (34°C). Weather in July »

Weather in August

August, the last month of the summer in Mason, is also a moderately hot month, with an average temperature fluctuating between 82.2°F (27.9°C) and 64.9°F (18.3°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 82.2°F (27.9°C). Weather in August »

Weather in September

September, the first month of the autumn in Mason, is still a warm month, with temperature in the range of an average high of 77.5°F (25.3°C) and an average low of 59.4°F (15.2°C). In September, the average high-temperature is almost the same as in August - a still warm 77.5°F (25.3°C). Weather in September »

Weather in October

October, like September, in Mason, Illinois, is another enjoyable autumn month, with temperature in the range of an average low of 48.6°F (9.2°C) and an average high of 65.1°F (18.4°C). In October, the average high-temperature decreases from a warm 77.5°F (25.3°C) in September to an enjoyable 65.1°F (18.4°C). Weather in October »

Weather in November

November, the last month of the autumn in Mason, is also a fresh month, with an average temperature ranging between max 51.4°F (10.8°C) and min 37°F (2.8°C). In November, the average high-temperature drops from a comfortable 65.1°F (18.4°C) in October to a cool 51.4°F (10.8°C). Weather in November »

Weather in December

December, the first month of the winter in Mason, is also a wintry month, with an average temperature varying between 29.3°F (-1.5°C) and 40.6°F (4.8°C). In Mason, the average high-temperature in December decreases from a fresh 51.4°F (10.8°C) in November to a cold 40.6°F (4.8°C). Weather in December »
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FAQ

What is the coldest month in Mason?

January is the coldest month, with an average high-temperature of 35.6°F (2°C) and an average low-temperature of 23.4°F (-4.8°C).

How much does it rain in Mason?

In Mason, Illinois, during the entire year, the rain falls for 141.3 days and collects up to 26.77" (680mm) of precipitation.

When does it snow in Mason?

Months with snowfall in Mason are January through March, November and December.

What is the snowiest month in Mason?

January is the month with the most snowfall. Snow falls for 5.3 days and accumulates 2.01" (51mm) of snow.

How many days does it snow in Mason?

Throughout the year, there are 17.7 snowfall days, and 6.73" (171mm) of snow is accumulated.

What is the month with the least sunshine in Mason?

January has the least sunshine of the year, with an average of 4.3h of sunshine.

When is the lowest UV index in Mason?

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

What is the driest month in Mason?

The month with the least rainfall in Mason is February, when the rain falls for 7.6 days and typically collects 1.38" (35mm) of precipitation.

When is Daylight Saving Time (DST) in Mason?

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 is the wettest month in Mason?

April is the month with the most rainfall in Mason, Illinois. Rain falls for 14.3 days and accumulates 3.35" (85mm) of precipitation.

When it does not snow in Mason?

April through October are months without snowfall in Mason, Illinois.

When are the longest days in Mason?

The month with the longest days in Mason, Illinois, is June, with an average of 14h and 52min of daylight.

What month has the most sunshine in Mason?

With an average of 10.5h of sunshine, June has the most sunshine of the year.

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

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

What is the warmest month in Mason?

July is the warmest month in Mason, Illinois, with an average high-temperature of 83.7°F (28.7°C) and an average low-temperature of 67.1°F (19.5°C).

What is the most humid month in Mason?

The months with the highest humidity in Mason are July and August, with an average relative humidity of 81%.

What is the least humid month in Mason?

October is the least humid month in Mason, Illinois, with an average relative humidity of 71%.

What is the month with the shortest days in Mason?

With an average of 9h and 29min of daylight, December has the shortest days of the year in Mason.

Average temperature
Mason, IL

Average temperature - Mason, IL

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.6°F).

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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Average pressure
Mason, IL

Average pressure - Mason, IL

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Mason, IL

Average wind speed - Mason, IL

The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity
Mason, IL

Average humidity - Mason, IL

The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).

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Average rainfall
Mason, IL

Average rainfall - Mason, IL

The wettest month (with the highest rainfall) is April (3.35").
The driest month (with the least rainfall) is February (1.38").

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Average rainfall days
Mason, IL

Average rainfall days - Mason, IL

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall
Mason, IL

Average snowfall - Mason, IL

The month with the highest snowfall is January (2.01").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Mason, IL

Average snowfall days - Mason, IL

The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Mason, IL

Average daylight / Average sunshine - Mason, IL

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days
Mason, IL

Average sunshine days - Mason, IL

The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is May (10.8 days).

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Average UV index
Mason, IL

Average UV index - Mason, IL

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Mason, IL

Average visibility - Mason, IL

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

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