Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
April's onset witnesses a shift in the average high-temperature, moving from a cool 50.2°F (10.1°C) in March to an enjoyable 61.7°F (16.5°C). Throughout the nights in April, Williamstown experiences an average low-temperature of 45.5°F (7.5°C).Humidity
The least humid month is April, with an average relative humidity of 71%.Rainfall
In April, the rain falls for 15.3 days. Throughout April, 2.6" (66mm) of precipitation is accumulated. Throughout the year, there are 154.9 rainfall days, and 30.47" (774mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In April, in Williamstown, it is snowing for 0.1 days. Throughout April, 0.08" (2mm) of snow is accumulated. Throughout the year, in Williamstown, there are 17.8 snowfall days, and 10.28" (261mm) of snow is accumulated.Daylight
In Williamstown, the average length of the day in April is 13h and 17min.On the first day of the month, sunrise is at 6:42 am and sunset at 7:24 pm. On the last day of April, in Williamstown, sunrise is at 6:00 am and sunset at 7:53 pm EDT.
Sunshine
The average sunshine in April is 8.6h.UV index
In Williamstown, the average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In April, the maximum UV index of 4 suggests these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Williamstown in April?
What is the least humid month in Williamstown?
What is the average humidity in April in Williamstown?
How much does it rain in Williamstown in April?
How much does it snow in Williamstown in April?
What is the average length of the day in April in Williamstown?
What time are sunrise and sunset in April in Williamstown?
How long on average sun shines in April in Williamstown?
What is the UV index reading in April in Williamstown?
Average temperature in April
Williamstown, NJ
- Average high temperature in April: 61.7°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 April: 45.5°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 April
Williamstown, NJ
- Average pressure in April: 29.99"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 April
Williamstown, NJ
- Average wind speed in April: 8.7mph
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 April
Williamstown, NJ
- Average humidity in April: 71%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in April
Williamstown, NJ
- Average rainfall in April: 2.6"
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 April
Williamstown, NJ
- Average rainfall days in April: 15.3 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 April
Williamstown, NJ
- Average snowfall in April: 0.08"
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 April
Williamstown, NJ
- Average snowfall days in April: 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 April /
Average sunshine in April
Williamstown, NJ
- Average daylight in April: 13h 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 April: 8h and 4min
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 April
Williamstown, NJ
- Average sunshine days in April: 13.5 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 April
Williamstown, NJ
- Average UV index in April: 4
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 April
Williamstown, NJ
- Average cloud cover in April: 42
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 April
Williamstown, NJ
- Average visibility in April: 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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