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
As April transitions into May, a change in temperatures is observed, with average highs moving from a refreshing 61.7°F (16.5°C) to a pleasant 71.8°F (22.1°C). Throughout the month of May, Williamstown witnesses an average low-temperature of 55.2°F (12.9°C).Humidity
The average relative humidity in May is 77%.Rainfall
In Williamstown, New Jersey, in May, it is raining for 16.5 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, there are 154.9 rainfall days, and 30.47" (774mm) of precipitation is accumulated.Snowfall
Months with snowfall in Williamstown are January through May, November and December. May is the last month it regularly snows in Williamstown, New Jersey. During 0.1 snowfall days, in May, Williamstown aggregates 0.16" (4mm) of snow. Throughout the year, in Williamstown, there are 17.8 snowfall days, and 10.28" (261mm) of snow is accumulated.Daylight
The average length of the day in May in Williamstown is 14h and 23min.On the first day of the month, sunrise is at 5:59 am and sunset at 7:54 pm. On the last day of May, in Williamstown, New Jersey, sunrise is at 5:34 am and sunset at 8:21 pm EDT.
Sunshine
In May, the average sunshine in Williamstown is 8.8h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 6 in May translates into this advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Williamstown in May?
What is the average humidity in May in Williamstown?
How much does it rain in Williamstown in May?
What is the last month it snows in Williamstown?
How many hours of daylight does Williamstown have in May?
When is the sunrise / sunset in May in Williamstown?
How long on average sun shines in May in Williamstown?
When is the highest UV index in Williamstown?
What is the UV index intensity in May in Williamstown?
Average temperature in May
Williamstown, NJ
- Average high temperature in May: 71.8°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in May: 55.2°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in May
Williamstown, NJ
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Williamstown, NJ
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in May
Williamstown, NJ
- Average humidity in May: 77%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in May
Williamstown, NJ
- Average rainfall in May: 2.52"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in May
Williamstown, NJ
- Average rainfall days in May: 16.5 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in May
Williamstown, NJ
- Average snowfall in May: 0.16"
The month with the highest snowfall is March (3.54").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in May
Williamstown, NJ
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Williamstown, NJ
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in May
Williamstown, NJ
- Average sunshine days in May: 12.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in May
Williamstown, NJ
- Average UV index in May: 6
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, February, November and December (UV index 2).
Average cloud cover in May
Williamstown, NJ
- Average cloud cover in May: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in May
Williamstown, NJ
- Average visibility in May: 6mi
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).
Williamstown, New Jersey, USA
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