Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May's arrival signals a temperature shift, moving from a comfortable 63.1°F (17.3°C) in April to an agreeable 72.9°F (22.7°C). During the nights in May, an average low-temperature of 56.5°F (13.6°C) is observed in Williamsville, Illinois.Humidity
In Williamsville, the average relative humidity in May is 77%.Rainfall
In Williamsville, during May, the rain falls for 17 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 131.5 rainfall days, and 18.54" (471mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Williamsville.Daylight
In May, the average length of the day in Williamsville is 14h and 24min.On the first day of May in Williamsville, sunrise is at 5:57 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:20 pm CDT.
Sunshine
In May, the average sunshine in Williamsville, Illinois, is 9.3h.UV index
In Williamsville, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 5 during May translates into the following directions:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What is the average May temperature in Williamsville?
What is the average humidity in May in Williamsville?
How much does it rain in Williamsville in May?
When it does not snow in Williamsville?
Does it snow in Williamsville in May?
How many hours of daylight does Williamsville have in May?
When are sunrise and sunset in May in Williamsville?
How many hours of sunshine does Williamsville have in May?
What is the UV index reading in May in Williamsville?
Average temperature in May
Williamsville, IL
- Average high temperature in May: 72.9°F
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).
- Average low temperature in May: 56.5°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 in May
Williamsville, IL
- Average pressure in May: 29.95"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 in May
Williamsville, IL
- Average wind speed in May: 8.6mph
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 in May
Williamsville, IL
- Average humidity in May: 77%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Williamsville, IL
- Average rainfall in May: 2.09"
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 in May
Williamsville, IL
- Average rainfall days in May: 17 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 in May
Williamsville, IL
- Average snowfall in May: 0"
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 in May
Williamsville, IL
- Average snowfall days in May: 0 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 in May /
Average sunshine in May
Williamsville, IL
- Average daylight in May: 14h 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 May: 9h and 2min
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 in May
Williamsville, IL
- Average sunshine days in May: 11.5 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 in May
Williamsville, IL
- Average UV index in May: 5
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 in May
Williamsville, IL
- Average cloud cover in May: 38
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 in May
Williamsville, IL
- Average visibility in May: 6mi
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).
Williamsville, Illinois, USA
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