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, 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 »
[Resources]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
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).
Average pressure
Williamsville, IL
- Average pressure in January:
30.15"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:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.12"Hg
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
Williamsville, IL
- Average wind speed in January:
10.4mph - 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:
7.3mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7.1mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.8mph
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).
Average humidity
Williamsville, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Williamsville, IL
- Average rainfall in January:
1.06" - Average rainfall in February:
0.98" - Average rainfall in March:
1.34" - Average rainfall in April:
2.05" - Average rainfall in May:
2.09" - Average rainfall in June:
2.36"
- Average rainfall in July:
1.69" - Average rainfall in August:
1.89" - Average rainfall in September:
1.85" - Average rainfall in October:
1.46" - Average rainfall in November:
0.94" - Average rainfall in December:
0.83"
The wettest month (with the highest rainfall) is June (2.36").
The driest month (with the least rainfall) is December (0.83").
Average rainfall days
Williamsville, IL
- Average rainfall days in January:
5.8 days - Average rainfall days in February:
5.7 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
17 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
11.6 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
8.2 days - Average rainfall days in December:
6.6 days
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).
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").
Average snowfall days
Williamsville, IL
- Average snowfall days in January:
8 days - Average snowfall days in February:
6.3 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
0.5 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:
1.5 days - Average snowfall days in December:
4.8 days
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).
Average daylight / Average sunshine
Williamsville, IL
- Average daylight in January:
9h and 43min - Average daylight in February:
10h and 43min - Average daylight in March:
11h and 59min - Average daylight in April:
13h and 17min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 58min
- Average daylight in July:
14h and 41min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 26min - Average daylight in October:
11h and 8min - Average daylight in November:
9h and 59min - Average daylight in December:
9h and 23min
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).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 12min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 18min - Average sunshine in October:
6h and 6min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 42min
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).
Average sunshine days
Williamsville, IL
- Average sunshine days in January:
19.3 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
16.2 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
11.5 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
13.1 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
16.8 days - Average sunshine days in October:
20 days - Average sunshine days in November:
19.9 days - Average sunshine days in December:
20.5 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.5 days).
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).
Average cloud cover
Williamsville, IL
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are June, August and September (Cloud cover 30).
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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