Climate and monthly weather forecast
Mason City, IL

Weather in January

January, like December, in Mason City, Illinois, is a wintry winter month, with an average temperature ranging between min 19.9°F (-6.7°C) and max 32°F (0°C). The coldest month is January, with an average high-temperature of 32°F (0°C) and an average low-temperature of 19.9°F (-6.7°C). Weather in January »

Weather in February

February, the last month of the winter in Mason City, is also a wintry month, with an average temperature fluctuating between 24.1°F (-4.4°C) and 37.2°F (2.9°C). In February, the average high-temperature is almost the same as in January - a still wintry 37.2°F (2.9°C). Weather in February »

Weather in March

March, the first month of the spring in Mason City, is a cool month, with an average temperature fluctuating between 50°F (10°C) and 35.1°F (1.7°C). In Mason City, the average high-temperature in March increases from a cold 37.2°F (2.9°C) in February to a cool 50°F (10°C). Weather in March »

Weather in April

April is an enjoyable spring month in Mason City, Illinois, with an average temperature ranging between max 61.7°F (16.5°C) and min 45.5°F (7.5°C). In April, the average high-temperature rises from a fresh 50°F (10°C) in March to a comfortable 61.7°F (16.5°C). Weather in April »

Weather in May

May, the last month of the spring in Mason City, is an agreeable month, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 55.9°F (13.3°C). In May, the average high-temperature rises from an enjoyable 61.7°F (16.5°C) in April to an agreeable 72.5°F (22.5°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Mason City, Illinois, with an average temperature fluctuating between 63.9°F (17.7°C) and 80.8°F (27.1°C). In Mason City, Illinois, the average high-temperature in June marginally rises from an agreeable 72.5°F (22.5°C) in May to a warm 80.8°F (27.1°C). Weather in June »

Weather in July

July, like June, in Mason City, Illinois, is a moderately hot summer month, with an average temperature varying between 82.4°F (28°C) and 65.8°F (18.8°C). With an average high-temperature of 82.4°F (28°C) and an average low-temperature of 65.8°F (18.8°C), July is the warmest month. In July, the average heat index is computed to be a hot 91.4°F (33°C). Weather in July »

Weather in August

August, the last month of the summer in Mason City, is also a moderately hot month, with an average temperature fluctuating between 64°F (17.8°C) and 81.9°F (27.7°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 81.9°F (27.7°C). Weather in August »

Weather in September

September, the first month of the autumn in Mason City, is also a moderately hot month, with temperature in the range of an average low of 58.5°F (14.7°C) and an average high of 76.8°F (24.9°C). In September, the average high-temperature is essentially the same as in August - a still warm 76.8°F (24.9°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Mason City, Illinois, with an average temperature fluctuating between 63.7°F (17.6°C) and 47.3°F (8.5°C). In Mason City, the average high-temperature in October decreases from a moderately hot 76.8°F (24.9°C) in September to an enjoyable 63.7°F (17.6°C). Weather in October »

Weather in November

November, the last month of the autumn in Mason City, is another chilly month, with an average temperature varying between 35.4°F (1.9°C) and 49.6°F (9.8°C). In November, the average high-temperature decreases from an enjoyable 63.7°F (17.6°C) in October to a frosty 49.6°F (9.8°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Mason City, Illinois, with temperature in the range of an average low of 27.1°F (-2.7°C) and an average high of 38.3°F (3.5°C). In December, the average high-temperature decreases from a chilly 49.6°F (9.8°C) in November to a wintry 38.3°F (3.5°C). Weather in December »
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FAQ

What is the coldest month in Mason City?

January is the coldest month in Mason City, Illinois, with an average high-temperature of 32°F (0°C) and an average low-temperature of 19.9°F (-6.7°C).

How many days does it rain in Mason City?

Throughout the year, in Mason City, Illinois, there are 150 rainfall days, and 29.84" (758mm) of precipitation is accumulated.

When does it snow in Mason City?

Months with snowfall in Mason City are January through April, October through December.

What is the snowiest month in Mason City?

The month with the most snowfall is January, when snow falls for 10.7 days and typically aggregates up to 3.98" (101mm) of snow.

How many days does it snow in Mason City?

Throughout the year, there are 31.9 snowfall days, and 11.06" (281mm) of snow is accumulated.

What is the month with the least sunshine in Mason City?

With an average of 4.1h of sunshine, January has the least sunshine of the year in Mason City, Illinois.

What is the month with the lowest UV index in Mason City?

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

When is Daylight Saving Time (DST) in Mason City?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Mason City, 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 rainiest month in Mason City?

May is the month with the most rainfall in Mason City. Rain falls for 18.9 days and accumulates 3.98" (101mm) of precipitation.

When it does not snow in Mason City?

May through September are months without snowfall in Mason City.

When are the longest days in Mason City?

With an average of 14h and 59min of daylight, June has the longest days of the year in Mason City, Illinois.

What month has the most sunshine in Mason City?

With an average of 10.3h of sunshine, June has the most sunshine of the year in Mason City.

When is the highest UV index in Mason City?

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 Mason City?

The warmest month in Mason City is July, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 65.8°F (18.8°C).

What is the most humid month in Mason City?

July is the most humid month, with an average relative humidity of 84%.

What is the least humid month in Mason City?

October is the least humid month in Mason City, with an average relative humidity of 70%.

What is the driest month in Mason City?

The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 1.46" (37mm) of precipitation.

What is the month with the shortest days in Mason City?

With an average of 9h and 22min of daylight, December has the shortest days of the year in Mason City, Illinois.

Average temperature
Mason City, IL

Average temperature - Mason City, IL

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32°F).

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).

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Average pressure
Mason City, IL

Average pressure - Mason City, IL

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Mason City, IL

Average wind speed - Mason City, IL

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

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Average rainfall
Mason City, IL

Average rainfall - Mason City, IL

The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is December (1.46").

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Average rainfall days
Mason City, IL

Average rainfall days - Mason City, IL

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is February (6.2 days).

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Average snowfall
Mason City, IL

Average snowfall - Mason City, IL

The month with the highest snowfall is January (3.98").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Mason City, IL

Average snowfall days - Mason City, IL

The month with the highest number of snowfall days is January (10.7 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
Mason City, IL

Average daylight / Average sunshine - Mason City, IL

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 22min).

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 6min).

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Average sunshine days
Mason City, IL

Average sunshine days - Mason City, IL

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.5 days).

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Average UV index
Mason City, IL

Average UV index - Mason City, 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 City, IL

Average visibility - Mason City, 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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