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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 an icy winter month in Williamstown, New Jersey, with an average temperature varying between 38.1°F (3.4°C) and 26.8°F (-2.9°C). January, with its high-temperature average of 38.1°F (3.4°C) and a low-temperature average of 26.8°F (-2.9°C), is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Williamstown, is also an icy month, with an average temperature varying between 28.6°F (-1.9°C) and 41.9°F (5.5°C). Upon the beginning of February, Williamstown's high-temperatures register at a still icy 41.9°F (5.5°C), closely mirroring the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Williamstown, New Jersey, with an average temperature varying between 50.2°F (10.1°C) and 35.6°F (2°C). Williamstown's weather in March shows a minor rise in the average high-temperature, moving slightly up from February's wintry 41.9°F (5.5°C) to a cool 50.2°F (10.1°C). Weather in March »
Weather in April
April is an enjoyable spring month in Williamstown, New Jersey, with an average temperature fluctuating between 45.5°F (7.5°C) and 61.7°F (16.5°C). 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). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Williamstown, New Jersey, with an average temperature varying between 71.8°F (22.1°C) and 55.2°F (12.9°C). 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). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Williamstown, New Jersey, with an average temperature ranging between min 63°F (17.2°C) and max 79.7°F (26.5°C). Williamstown experiences a minor temperature shift with the start of June, with average high-temperatures moving from a pleasant 71.8°F (22.1°C) in May to a warm 79.7°F (26.5°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Williamstown, New Jersey, with temperature in the range of an average high of 85.3°F (29.6°C) and an average low of 68.5°F (20.3°C). Williamstown's warmest temperatures are experienced in July, with average high temperatures of 85.3°F (29.6°C) and lows of 68.5°F (20.3°C). The heat index value for July is evaluated at a very hot 95°F (35°C). Weather in July »
Weather in August
August, the last month of the summer in Williamstown, is also a moderately hot month, with an average temperature varying between 67.6°F (19.8°C) and 83.3°F (28.5°C). As Williamstown transitions into August, the average high-temperature stands at a still warm 83.3°F (28.5°C), offering little variation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Williamstown, is still a warm month, with temperature in the range of an average high of 76.5°F (24.7°C) and an average low of 61.2°F (16.2°C). In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 83.3°F (28.5°C) in August to a still moderately hot 76.5°F (24.7°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Williamstown, New Jersey, with an average temperature fluctuating between 51.3°F (10.7°C) and 65.3°F (18.5°C). A shift in the average high-temperature occurs in October, reducing from a moderately hot 76.5°F (24.7°C) in September to a comfortable 65.3°F (18.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Williamstown, is another cool month, with an average temperature fluctuating between 40.1°F (4.5°C) and 53.4°F (11.9°C). Observing a mild shift, the average high-temperature during November reduces from October's refreshing 65.3°F (18.5°C) to a fresh 53.4°F (11.9°C). Weather in November »
Weather in December
December, the first month of the winter in Williamstown, is also a frosty month, with an average temperature varying between 44.2°F (6.8°C) and 32.9°F (0.5°C). The onset of December comes with a shift in the average high-temperature, falling from a fresh 53.4°F (11.9°C) in November to a frosty 44.2°F (6.8°C). Weather in December »
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Williamstown?
Williamstown's coldest temperatures are experienced in January, with average high temperatures of 38.1°F (3.4°C) and lows of 26.8°F (-2.9°C).
How many days does it rain in Williamstown?
Throughout the year, in Williamstown, there are 154.9 rainfall days, and 30.47" (774mm) of precipitation is accumulated.
When does it snow in Williamstown?
Months with snowfall in Williamstown are January through May, November and December.
How much does it snow in Williamstown?
In Williamstown, New Jersey, during the entire year, snow falls for 17.8 days and aggregates up to 10.28" (261mm) of snow.
What is the month with the lowest UV index in Williamstown?
The months with the lowest UV index in Williamstown, New Jersey, are January, February, November and December, with an average maximum UV index of 2.
What is the month with the least sunshine in Williamstown?
February has the least sunshine of the year in Williamstown, New Jersey, with an average of 4.9h of sunshine.
When does it snow the most in Williamstown?
The month with the most snowfall is March, when snow falls for 3.9 days and typically aggregates up to 3.54" (90mm) of snow.
When is Daylight Saving Time (DST) in Williamstown?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Williamstown, New Jersey, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month in Williamstown?
The least humid month is April, with an average relative humidity of 71%.
When is the highest UV index in Williamstown?
The months with the highest UV index in Williamstown are May through August, with an average maximum UV index of 6.
When it does not snow in Williamstown?
In Williamstown, snow does not fall in June through October.
When are the longest days in Williamstown?
June has the longest days of the year, with an average of 14h and 54min of daylight.
What time of the year is the hottest in Williamstown?
July is the warmest month in Williamstown, with the temperature often reaching an average high of 85.3°F (29.6°C) and an average low of 68.5°F (20.3°C).
What month has the most sunshine in Williamstown?
July has the most sunshine of the year, with an average of 10.8h of sunshine.
What is the driest month in Williamstown?
The month with the least rainfall is September, when the rain falls for 12 days and typically collects 1.73" (44mm) of precipitation.
What is the most humid month in Williamstown?
October is the most humid month in Williamstown, with an average relative humidity of 78%.
What is the rainiest month in Williamstown?
December is the month with the most rainfall in Williamstown, New Jersey. Rain falls for 11 days and accumulates 3.35" (85mm) of precipitation.
What is the month with the shortest days in Williamstown?
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Williamstown, NJ
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).
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
Williamstown, NJ
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.09"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
Williamstown, NJ
- Average wind speed in January:
8.4mph - Average wind speed in February:
8.5mph - Average wind speed in March:
8.6mph - Average wind speed in April:
8.7mph - Average wind speed in May:
7.1mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.7mph - Average wind speed in September:
6.2mph - Average wind speed in October:
7.3mph - Average wind speed in November:
7.6mph - Average wind speed in December:
7.8mph
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
Williamstown, NJ
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall
Williamstown, NJ
- Average rainfall in January:
2.09" - Average rainfall in February:
2.4" - Average rainfall in March:
2.87" - Average rainfall in April:
2.6" - Average rainfall in May:
2.52" - Average rainfall in June:
2.44"
- Average rainfall in July:
2.64" - Average rainfall in August:
2.91" - Average rainfall in September:
1.73" - Average rainfall in October:
2.6" - Average rainfall in November:
2.32" - Average rainfall in December:
3.35"
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
Williamstown, NJ
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
9.9 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
15.2 days
- Average rainfall days in July:
16.9 days - Average rainfall days in August:
14.7 days - Average rainfall days in September:
12 days - Average rainfall days in October:
12.1 days - Average rainfall days in November:
9.2 days - Average rainfall days in December:
11 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
Williamstown, NJ
- Average snowfall in January:
2.4" - Average snowfall in February:
2.36" - Average snowfall in March:
3.54" - Average snowfall in April:
0.08" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
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
Williamstown, NJ
- Average snowfall days in January:
5.5 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
3.9 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0.1 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 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
3 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 / Average sunshine
Williamstown, NJ
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h 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 January:
5h and 1min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 1min
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
Williamstown, NJ
- Average sunshine days in January:
18.2 days - Average sunshine days in February:
14.7 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
13.5 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
12.4 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
16.9 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
17.9 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
Williamstown, NJ
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
Williamstown, NJ
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
Williamstown, NJ
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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