Climate and monthly weather forecast
Mount Vernon, IL

englishespañol中文
Share

Weather in January

January, like December, in Mount Vernon, Illinois, is another cold winter month, with an average temperature varying between 37.9°F (3.3°C) and 24.8°F (-4°C). With average high and low temperatures of 37.9°F (3.3°C) and 24.8°F (-4°C) respectively, January is Mount Vernon's coldest month. Weather in January »

Weather in February

February, the last month of the winter in Mount Vernon, is also an icy month, with an average temperature ranging between min 28.8°F (-1.8°C) and max 42.4°F (5.8°C). The onset of February brings an average high-temperature of a still wintry 42.4°F (5.8°C), nearly matching the January temperature. Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Mount Vernon, Illinois, with an average temperature ranging between min 38.3°F (3.5°C) and max 54.3°F (12.4°C). As March arrives, Mount Vernon's weather shows an increase in high-temperatures, moving from February's icy 42.4°F (5.8°C) to a fresh 54.3°F (12.4°C). Weather in March »

Weather in April

April is a refreshing spring month in Mount Vernon, Illinois, with an average temperature varying between 47.8°F (8.8°C) and 65.1°F (18.4°C). The onset of April brings a temperature shift, with the average high-temperature moving from a cool 54.3°F (12.4°C) in March to an enjoyable 65.1°F (18.4°C). Weather in April »

Weather in May

May, the last month of the spring in Mount Vernon, is a warm month, with an average temperature fluctuating between 57.9°F (14.4°C) and 74.8°F (23.8°C). As April transitions into May, Mount Vernon sees a rise in the average high-temperature, moving from a refreshing 65.1°F (18.4°C) to a moderately hot 74.8°F (23.8°C). Weather in May »

Weather in June

The first month of the summer, June, is also a moderately hot month in Mount Vernon, Illinois, with an average temperature fluctuating between 66.6°F (19.2°C) and 83.5°F (28.6°C). As Mount Vernon enters June, the average high-temperature marginally increases from the a warm 74.8°F (23.8°C) of May to a still moderately hot 83.5°F (28.6°C). Weather in June »

Weather in July

July, like June, in Mount Vernon, Illinois, is a moderately hot summer month, with an average temperature ranging between max 85.6°F (29.8°C) and min 67.8°F (19.9°C). July, characterized by an average high temperature of 85.6°F (29.8°C) and a low temperature of 67.8°F (19.9°C), is generally the warmest month. July's heat index is evaluated at a fiery hot 98.6°F (37°C). Weather in July »

Weather in August

August, the last month of the summer in Mount Vernon, is also a moderately hot month, with an average temperature fluctuating between 65.8°F (18.8°C) and 84°F (28.9°C). The commencement of August brings an average high-temperature of a still warm 84°F (28.9°C), marking an inconsequential divergence from July. Weather in August »

Weather in September

September, the first month of the autumn in Mount Vernon, is still a warm month, with an average temperature fluctuating between 79°F (26.1°C) and 60.1°F (15.6°C). As Mount Vernon transitions into September, the average high-temperature stands at a still warm 79°F (26.1°C), offering little variation from the preceding month. Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Mount Vernon, Illinois, with an average temperature ranging between max 66.4°F (19.1°C) and min 49.1°F (9.5°C). Start of October brings a shift in the average high-temperature, falling from September's warm 79°F (26.1°C) to a refreshing 66.4°F (19.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Mount Vernon, Illinois, with an average temperature fluctuating between 52.7°F (11.5°C) and 37.9°F (3.3°C). A shift in the average high-temperature occurs in November, reducing from an enjoyable 66.4°F (19.1°C) in October to a cool 52.7°F (11.5°C). Weather in November »

Weather in December

December, the first month of the winter in Mount Vernon, is still a chilly month, with temperature in the range of an average high of 43.2°F (6.2°C) and an average low of 30.9°F (-0.6°C). The transition into December indicates a reduction in the average high-temperature, down to a chilly 43.2°F (6.2°C) from November's fresh 52.7°F (11.5°C). Weather in December »
[Resources]

Frequently asked questions

What is the coldest month in Mount Vernon?

January, on average, is the coldest month in Mount Vernon, registering a high temperature of 37.9°F (3.3°C) and a low of 24.8°F (-4°C).

How much does it rain in Mount Vernon?

In Mount Vernon, during the entire year, the rain falls for 145.8 days and collects up to 29.13" (740mm) of precipitation.

When does it snow in Mount Vernon?

Months with snowfall in Mount Vernon are January through April, November and December.

How much does it snow in Mount Vernon?

In Mount Vernon, during the entire year, snow falls for 15.4 days and aggregates up to 5.87" (149mm) of snow.

What is the month with the least sunshine in Mount Vernon?

With an average of 4.5h of sunshine, January has the least sunshine of the year in Mount Vernon.

When is the lowest UV index in Mount Vernon?

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mount Vernon, Illinois.

When does it snow the most in Mount Vernon?

The month with the most snowfall is February, when snow falls for 4.5 days and typically aggregates up to 1.73" (44mm) of snow.

When is Daylight Saving Time (DST) in Mount Vernon?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Mount Vernon, 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 rainiest month in Mount Vernon?

The month with the most rainfall is April, when the rain falls for 14.7 days and typically aggregates up to 3.78" (96mm) of precipitation.

What is the most humid month in Mount Vernon?

With an average relative humidity of 80%, May is the most humid month in Mount Vernon, Illinois.

When it does not snow in Mount Vernon?

In Mount Vernon, Illinois, snow does not fall in May through October.

What are the months with the highest UV index in Mount Vernon?

The months with the highest UV index in Mount Vernon are May through August, with an average maximum UV index of 6.

When are the longest days in Mount Vernon?

With an average of 14h and 48min of daylight, June has the longest days of the year in Mount Vernon, Illinois.

What month has the most sunshine in Mount Vernon?

With an average of 10.5h of sunshine, June has the most sunshine of the year in Mount Vernon, Illinois.

What part of the year is the hottest in Mount Vernon?

Mount Vernon experiences its average highest temperatures in July, reaching a peak of 85.6°F (29.8°C) and a minimum of 67.8°F (19.9°C).

What is the driest month in Mount Vernon?

September is the month with the least rainfall. Rain falls for 11.6 days and accumulates 1.61" (41mm) of precipitation.

What is the least humid month in Mount Vernon?

With an average relative humidity of 71%, October is the least humid month in Mount Vernon.

What is the month with the shortest days in Mount Vernon?

December has the shortest days of the year in Mount Vernon, Illinois, with an average of 9h and 36min of daylight.

Average temperature
Mount Vernon, IL

Average temperature - Mount Vernon, IL

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

[Resources]

Average pressure
Mount Vernon, IL

Average pressure - Mount Vernon, 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).

[Resources]

Average wind speed
Mount Vernon, IL

Average wind speed - Mount Vernon, IL

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).

[Resources]

Average rainfall
Mount Vernon, IL

Average rainfall - Mount Vernon, IL

The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").

[Resources]

Average rainfall days
Mount Vernon, IL

Average rainfall days - Mount Vernon, IL

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).

[Resources]

Average snowfall
Mount Vernon, IL

Average snowfall - Mount Vernon, IL

The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").

[Resources]

Average snowfall days
Mount Vernon, IL

Average snowfall days - Mount Vernon, IL

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average daylight / Average sunshine
Mount Vernon, IL

Average daylight / Average sunshine - Mount Vernon, IL

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

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 30min).

[Resources]

Average sunshine days
Mount Vernon, IL

Average sunshine days - Mount Vernon, IL

The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).

[Resources]

Average UV index
Mount Vernon, IL

Average UV index - Mount Vernon, IL

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

[Resources]

Average visibility
Mount Vernon, IL

Average visibility - Mount Vernon, 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).

[Resources]

Mount Vernon, Illinois, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location