Climate and monthly weather forecast
Williamsville, IL

Weather in January

January, the same as December, is another cold winter month in Williamsville, Illinois, with an average temperature fluctuating between 33.1°F (0.6°C) and 20.8°F (-6.2°C). January is the coldest month, with an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 20.8°F (-6.2°C). Weather in January »

Weather in February

February, the last month of the winter in Williamsville, is another cold month, with an average temperature varying between 25°F (-3.9°C) and 37.9°F (3.3°C). In Williamsville, Illinois, the average high-temperature in February is almost the same as in January - a still wintry 37.9°F (3.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Williamsville, Illinois, with an average temperature ranging between min 35.6°F (2°C) and max 51.1°F (10.6°C). In March, the average high-temperature rises from a cold 37.9°F (3.3°C) in February to a cool 51.1°F (10.6°C). Weather in March »

Weather in April

April is an enjoyable spring month in Williamsville, Illinois, with an average temperature varying between 63.1°F (17.3°C) and 46.2°F (7.9°C). In Williamsville, Illinois, the average high-temperature in April increases from a fresh 51.1°F (10.6°C) in March to an enjoyable 63.1°F (17.3°C). Weather in April »

Weather in May

May, the last month of the spring in Williamsville, is an agreeable month, with an average temperature ranging between min 56.5°F (13.6°C) and max 72.9°F (22.7°C). In May, the average high-temperature increases from an enjoyable 63.1°F (17.3°C) in April to an agreeable 72.9°F (22.7°C). Weather in May »

Weather in June

June, the first month of the summer in Williamsville, is a moderately hot month, with an average temperature ranging between max 81.1°F (27.3°C) and min 64.4°F (18°C). In Williamsville, the average high-temperature in June slightly increases from an agreeable 72.9°F (22.7°C) in May to a moderately hot 81.1°F (27.3°C). Weather in June »

Weather in July

July, like June, in Williamsville, Illinois, is another warm summer month, with temperature in the range of an average high of 82.8°F (28.2°C) and an average low of 66°F (18.9°C). July is the warmest month, with an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 66°F (18.9°C). The average heat index in July is computed to be a tropical 91.4°F (33°C). Weather in July »

Weather in August

August, the last month of the summer in Williamsville, is another warm month, with an average temperature ranging between max 81.7°F (27.6°C) and min 64°F (17.8°C). In Williamsville, the average high-temperature in August is relatively the same as in July - a still moderately hot 81.7°F (27.6°C). Weather in August »

Weather in September

September, the first month of the autumn in Williamsville, is still a warm month, with an average temperature ranging between min 58.5°F (14.7°C) and max 77.2°F (25.1°C). In September, the average high-temperature is essentially the same as in August - a still moderately hot 77.2°F (25.1°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Williamsville, Illinois, with an average temperature varying between 48.2°F (9°C) and 64°F (17.8°C). In October, the average high-temperature decreases from a warm 77.2°F (25.1°C) in September to a comfortable 64°F (17.8°C). Weather in October »

Weather in November

November, the last month of the autumn in Williamsville, is also a fresh month, with an average temperature ranging between min 36.5°F (2.5°C) and max 50°F (10°C). In November, the average high-temperature decreases from a comfortable 64°F (17.8°C) in October to a fresh 50°F (10°C). Weather in November »

Weather in December

December, the first month of the winter in Williamsville, is also a wintry month, with an average temperature fluctuating between 28.2°F (-2.1°C) and 38.7°F (3.7°C). In December, the average high-temperature drops from a cool 50°F (10°C) in November to a wintry 38.7°F (3.7°C). Weather in December »
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FAQ

What is the coldest month in Williamsville?

With an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 20.8°F (-6.2°C), January is the coldest month.

How many days does it rain in Williamsville?

Throughout the year, in Williamsville, there are 131.5 rainfall days, and 18.54" (471mm) of precipitation is accumulated.

When does it snow in Williamsville?

Months with snowfall in Williamsville, Illinois, are January through April, November and December.

When does it snow the most in Williamsville?

January is the month with the most snowfall in Williamsville. Snow falls for 8 days and accumulates 1.81" (46mm) of snow.

How much does it snow in Williamsville?

Throughout the year, in Williamsville, there are 24.5 snowfall days, and 5.51" (140mm) of snow is accumulated.

What is the month with the least sunshine in Williamsville?

The month with the least sunshine is January, with an average of 4.1h of sunshine.

When is the lowest UV index in Williamsville?

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

When is Daylight Saving Time (DST) in Williamsville?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow in Williamsville?

May through October are months without snowfall.

What is the wettest month in Williamsville?

The month with the most rainfall is June, when the rain falls for 14.6 days and typically aggregates up to 2.36" (60mm) of precipitation.

When are the longest days in Williamsville?

June has the longest days of the year, with an average of 14h and 58min of daylight.

What month has the most sunshine in Williamsville?

The month with the most sunshine in Williamsville is June, with an average of 10.4h of sunshine.

When is the highest UV index in Williamsville?

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

What is the warmest month in Williamsville?

The warmest month is July, with an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 66°F (18.9°C).

What is the most humid month in Williamsville?

The most humid month in Williamsville, Illinois, is July, with an average relative humidity of 84%.

What is the least humid month in Williamsville?

With an average relative humidity of 70%, October is the least humid month in Williamsville.

What is the driest month in Williamsville?

The month with the least rainfall in Williamsville, Illinois, is December, when the rain falls for 6.6 days and typically collects 0.83" (21mm) of precipitation.

What is the month with the shortest days in Williamsville?

With an average of 9h and 23min of daylight, December has the shortest days of the year in Williamsville, Illinois.

Average temperature
Williamsville, IL

Average temperature - Williamsville, IL

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.1°F).

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

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Average pressure
Williamsville, IL

Average pressure - Williamsville, 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).

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Average wind speed
Williamsville, IL

Average wind speed - Williamsville, IL

The windiest months (with the highest average wind speed) are January and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

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Average rainfall
Williamsville, IL

Average rainfall - Williamsville, IL

The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is December (0.83").

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Average rainfall days
Williamsville, IL

Average rainfall days - Williamsville, IL

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall
Williamsville, IL

Average snowfall - Williamsville, IL

The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Williamsville, IL

Average snowfall days - Williamsville, IL

The month with the highest number of snowfall days is January (8 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
Williamsville, IL

Average daylight / Average sunshine - Williamsville, IL

The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days
Williamsville, IL

Average sunshine days - Williamsville, IL

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index
Williamsville, IL

Average UV index - Williamsville, 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
Williamsville, IL

Average visibility - Williamsville, 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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