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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Mason City, Illinois, is a wintry winter month, with an average temperature fluctuating between 19.9°F (-6.7°C) and 32°F (0°C). January, characterized by an average high temperature of 32°F (0°C) and a low temperature of 19.9°F (-6.7°C), is generally the coldest month. 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 ranging between min 24.1°F (-4.4°C) and max 37.2°F (2.9°C). A minor adjustment in Mason City's average high-temperature is noted with the start of February, touching a still cold 37.2°F (2.9°C) from January's 32°F (0°C). Weather in February »
Weather in March
March, the first month of the spring in Mason City, is a fresh month, with an average temperature fluctuating between 35.1°F (1.7°C) and 50°F (10°C). Mason City's transition into March brings a rise in the average high-temperature, moving from a wintry 37.2°F (2.9°C) in February to a cool 50°F (10°C). Weather in March »
Weather in April
April is a comfortable 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). The onset of April brings a rise in the average high-temperature, elevating from a cool 50°F (10°C) in March to an enjoyable 61.7°F (16.5°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Mason City, Illinois, with an average temperature varying between 72.5°F (22.5°C) and 55.9°F (13.3°C). Mason City's transition into May sees a rise in the average high-temperature, advancing from a comfortable 61.7°F (16.5°C) in April to a pleasant 72.5°F (22.5°C). Weather in May »
Weather in June
June, the first month of the summer in Mason City, is a warm month, with temperature in the range of an average low of 63.9°F (17.7°C) and an average high of 80.8°F (27.1°C). Mason City's transition into June is noticed by a slight rise in the average high-temperature, advancing from a pleasant 72.5°F (22.5°C) in May to a moderately hot 80.8°F (27.1°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Mason City, Illinois, with an average temperature fluctuating between 82.4°F (28°C) and 65.8°F (18.8°C). July tends to be the warmest month, with temperatures averaging a daily high of 82.4°F (28°C) and a low of 65.8°F (18.8°C). During July, the heat index is calculated to be a tropical 91.4°F (33°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Mason City, Illinois, with an average temperature varying between 81.9°F (27.7°C) and 64°F (17.8°C). At the start of August, Mason City's average high-temperature reaches a still moderately hot 81.9°F (27.7°C), subtly different from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Mason City, Illinois, with an average temperature fluctuating between 58.5°F (14.7°C) and 76.8°F (24.9°C). At the start of September, Mason City's average high-temperature reaches a still warm 76.8°F (24.9°C), subtly different from the preceding month. Weather in September »
Weather in October
October, the same as September, is another enjoyable 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). October's arrival comes with a decrease in the average high-temperature, moving 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
The last month of the autumn, November, is another chilly month in Mason City, Illinois, with temperature in the range of an average high of 49.6°F (9.8°C) and an average low of 35.4°F (1.9°C). In Mason City, the average high-temperature in November decreases from a refreshing 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 an icy month in Mason City, Illinois, with an average temperature fluctuating between 27.1°F (-2.7°C) and 38.3°F (3.5°C). The arrival of December corresponds with a temperature reduction, down from November's frosty 49.6°F (9.8°C) to an icy 38.3°F (3.5°C). Weather in December »
Updated: Jul 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
Mason City's January weather, marked by an average high temperature of 32°F (0°C) and an average low temperature of 19.9°F (-6.7°C), is the coldest in the year.
How many days does it rain in Mason City?
Throughout the year, there are 150 rainfall days, and 29.84" (758mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 10.7 days and accumulates 3.98" (101mm) of snow.
How much does it snow in Mason City?
In Mason City, during the entire year, snow falls for 31.9 days and aggregates up to 11.06" (281mm) of snow.
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.
What is the month with the lowest UV index?
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)?
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?
May is the month with the most rainfall. Rain falls for 18.9 days and accumulates 3.98" (101mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
With an average of 15h and 0min of daylight, June has the longest days of the year.
What month has the most sunshine?
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 Mason City?
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 City?
Mason City's warmest month, July, registers temperatures that range from a high of 82.4°F (28°C) to a low of 65.8°F (18.8°C).
What is the most humid month?
With an average relative humidity of 84%, July is the most humid month in Mason City.
What is the least humid month?
The least humid month is October, with an average relative humidity of 70%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 8.1 days and accumulates 1.46" (37mm) of precipitation.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 24min of daylight.
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).
Average pressure
Mason City, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Mason City, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.1mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.7mph
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).
Average humidity
Mason City, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Mason City, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.73" - Average rainfall in March:
2.4" - Average rainfall in April:
3.46" - Average rainfall in May:
3.98" - Average rainfall in June:
3.31"
- Average rainfall in July:
2.28" - Average rainfall in August:
2.2" - Average rainfall in September:
2.56" - Average rainfall in October:
2.76" - Average rainfall in November:
1.93" - Average rainfall in December:
1.46"
The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is December (1.46").
Average rainfall days
Mason City, IL
- Average rainfall days in January:
7 days - Average rainfall days in February:
6.2 days - Average rainfall days in March:
13.2 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
18.9 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
13.4 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
12.4 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
8.1 days
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).
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").
Average snowfall days
Mason City, IL
- Average snowfall days in January:
10.7 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
3.7 days - Average snowfall days in April:
0.9 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
2.3 days - Average snowfall days in December:
6 days
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).
Average daylight / Average sunshine
Mason City, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
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).
Average sunshine days
Mason City, IL
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
14.5 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
10.5 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
15.7 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
16.9 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
18 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.5 days).
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).
Average cloud cover
Mason City, IL
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 29).
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).
Mason City, Illinois, USA
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