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
With the onset of May, the average high-temperature slightly shifts from April's refreshing 58.6°F (14.8°C) to a pleasant 70.3°F (21.3°C). An average temperature of 53.4°F (11.9°C) marks the nights in May.Humidity
In May, the average relative humidity is 78%.Rainfall
In May, the rain falls for 19.3 days. Throughout May, 3.43" (87mm) of precipitation is accumulated. In Williamstown, during the entire year, the rain falls for 168.7 days and collects up to 29.72" (755mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Williamstown aggregates 0.04" (1mm) of snow. Throughout the year, there are 48.9 snowfall days, and 13.23" (336mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 29min.On the first day of May, sunrise is at 6:31 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:05 am and sunset at 8:59 pm EDT.
Sunshine
In Williamstown, the average sunshine in May is 8.8h.UV index
In Williamstown, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 5 in May interprets into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Williamstown in May?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Williamstown have in May?
What is the UV index reading in May?
Average temperature in May
Williamstown, OH
- Average high temperature in May: 70.3°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in May: 53.4°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in May
Williamstown, OH
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Williamstown, OH
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in May
Williamstown, OH
- Average humidity in May: 78%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in May
Williamstown, OH
- Average rainfall in May: 3.43"
The wettest month (with the highest rainfall) is June (3.54").
The driest month (with the least rainfall) is December (1.81").
Average rainfall days in May
Williamstown, OH
- Average rainfall days in May: 19.3 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in May
Williamstown, OH
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Williamstown, OH
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Williamstown, OH
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in May
Williamstown, OH
- Average sunshine days in May: 9.7 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in May
Williamstown, OH
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Williamstown, OH
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in May
Williamstown, OH
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, February, August and September (5mi).
Williamstown, Ohio, USA
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