Climate and monthly weather forecast
Mendon, IL

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Weather in January

January, like December, in Mendon, Illinois, is an icy winter month, with temperature in the range of an average high of 32.7°F (0.4°C) and an average low of 20.1°F (-6.6°C). January, with its high-temperature average of 32.7°F (0.4°C) and a low-temperature average of 20.1°F (-6.6°C), is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Mendon, is another cold month, with an average temperature ranging between max 37.6°F (3.1°C) and min 24.1°F (-4.4°C). February's advent notes a subtle adjustment in average high-temperature to a still icy 37.6°F (3.1°C) from January. Weather in February »

Weather in March

The first month of the spring, March, is a fresh month in Mendon, Illinois, with an average temperature varying between 50.9°F (10.5°C) and 35.1°F (1.7°C). With the onset of March, Mendon experiences a temperature shift, with the average high-temperature moving from a wintry 37.6°F (3.1°C) in February to a fresh 50.9°F (10.5°C). Weather in March »

Weather in April

April is a refreshing spring month in Mendon, Illinois, with an average temperature ranging between max 62.4°F (16.9°C) and min 45.1°F (7.3°C). In Mendon, the average high-temperature in April rises, from a cool 50.9°F (10.5°C) in March, to an enjoyable 62.4°F (16.9°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Mendon, Illinois, with an average temperature varying between 55.2°F (12.9°C) and 72°F (22.2°C). The shift into May is marked by a rise in the average high-temperature, moving from April's enjoyable 62.4°F (16.9°C) to a pleasant 72°F (22.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Mendon, Illinois, with an average temperature varying between 81.1°F (27.3°C) and 64°F (17.8°C). June's arrival sees a rise in the average high-temperature, jumping from May's pleasant 72°F (22.2°C) to a warm 81.1°F (27.3°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Mendon, Illinois, with an average temperature fluctuating between 83.8°F (28.8°C) and 66.6°F (19.2°C). Mendon notes the warmest temperatures in July, with a high average of 83.8°F (28.8°C) and a low of 66.6°F (19.2°C). The heat index value for July is evaluated at a hot 93.2°F (34°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Mendon, Illinois, with an average temperature ranging between max 82.9°F (28.3°C) and min 64.9°F (18.3°C). During August, the average high-temperature is a still warm 82.9°F (28.3°C), maintaining a close resemblance to that of the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Mendon, is still a warm month, with an average temperature varying between 58.1°F (14.5°C) and 77.5°F (25.3°C). The commencement of September indicates a gentle shift in the average high-temperature, receding from August's warm 82.9°F (28.3°C) to a still moderately hot 77.5°F (25.3°C). Weather in September »

Weather in October

October, like September, in Mendon, Illinois, is another comfortable autumn month, with an average temperature ranging between max 63.5°F (17.5°C) and min 46.8°F (8.2°C). October comes with a decrease in the average high-temperature, falling from a warm 77.5°F (25.3°C) in September to an enjoyable 63.5°F (17.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Mendon, is another cool month, with an average temperature varying between 35.8°F (2.1°C) and 50.2°F (10.1°C). The decrease of average high-temperatures is mild in November, with a decline from an enjoyable 63.5°F (17.5°C) in October to a cool 50.2°F (10.1°C). Weather in November »

Weather in December

December, the first month of the winter in Mendon, is also an icy month, with an average temperature ranging between min 26.8°F (-2.9°C) and max 38.5°F (3.6°C). The arrival of December indicates a decrease in the average high-temperature, moving from a fresh 50.2°F (10.1°C) in November to a wintry 38.5°F (3.6°C). Weather in December »
Updated: Jun 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

With its average high temperature of 32.7°F (0.4°C) and a low of 20.1°F (-6.6°C), January is regarded as the coldest month in Mendon.

What is the driest month?

The months with the least rainfall are January and December Rain falls for 5 days and accumulates 1.02" (26mm) of rain.

How many days does it rain?

Throughout the year, there are 134.2 rainfall days, and 23.15" (588mm) of precipitation is accumulated.

When does it snow?

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

What is the snowiest month?

The month with the most snowfall is January, when snow falls for 8.8 days and typically aggregates up to 2.76" (70mm) of snow.

How much does it snow?

Throughout the year, there are 27.6 snowfall days, and 7.95" (202mm) of snow is accumulated.

What is the month with the least sunshine?

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

What are the months with the lowest UV index in Mendon?

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 in Mendon?

The month with the most rainfall is May, when the rain falls for 16.9 days and typically aggregates up to 3.35" (85mm) of precipitation.

When it does not snow?

In Mendon, snow does not fall in May through September.

What is the most humid month in Mendon?

June and July, with an average relative humidity of 81%, are most humid months.

When are the longest days?

The month with the longest days is June, with an average of 15h and 0min of daylight.

When is the highest UV index?

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

What time of the year is the hottest?

July temperatures tend to peak at an average high of 83.8°F (28.8°C) and dip to a low of 66.6°F (19.2°C).

What month has the most sunshine?

With an average of 10.3h of sunshine, July has the most sunshine of the year.

What is the least humid month?

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

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
Mendon, IL

Average temperature - Mendon, IL

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (32.7°F).

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure
Mendon, IL

Average pressure - Mendon, IL

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed
Mendon, IL

Average wind speed - Mendon, IL

The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

Average humidity
Mendon, IL

Average humidity - Mendon, IL

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

Average rainfall
Mendon, IL

Average rainfall - Mendon, IL

The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are January and December (1.02").

Average rainfall days
Mendon, IL

Average rainfall days - Mendon, IL

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (5 days).

Average snowfall
Mendon, IL

Average snowfall - Mendon, IL

The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Mendon, IL

Average snowfall days - Mendon, IL

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Mendon, IL

Average daylight / Average sunshine - Mendon, IL

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).

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

Average sunshine days
Mendon, IL

Average sunshine days - Mendon, IL

The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is June (11.1 days).

Average UV index
Mendon, IL

Average UV index - Mendon, 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 visibility
Mendon, IL

Average visibility - Mendon, 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).

Mendon, Illinois, USA

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