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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, like December, in Williamstown, Pennsylvania, is another cold winter month, with temperature in the range of an average low of 20.8°F (-6.2°C) and an average high of 33.4°F (0.8°C). In Williamstown, January is the coldest month, with temperatures averaging a high of 33.4°F (0.8°C) and a low of 20.8°F (-6.2°C). Weather in January »
Weather in February
February, the last month of the winter in Williamstown, is also a wintry month, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 36.9°F (2.7°C). February's arrival brings an average high-temperature of a still wintry 36.9°F (2.7°C), slightly deviating from January's 33.4°F (0.8°C). Weather in February »
Weather in March
March, the first month of the spring in Williamstown, is a frosty month, with an average temperature fluctuating between 30.6°F (-0.8°C) and 46.4°F (8°C). Williamstown's March weather brings a rise in high-temperatures, moving from a wintry 36.9°F (2.7°C) in February to a frosty 46.4°F (8°C). Weather in March »
Weather in April
April in Williamstown, Pennsylvania, is a refreshing spring month, with an average temperature varying between 40.3°F (4.6°C) and 58.6°F (14.8°C). April brings a temperature increase, with average high-temperatures moving from March's chilly 46.4°F (8°C) to a moderate 58.6°F (14.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Williamstown, Pennsylvania, with an average temperature fluctuating between 69.3°F (20.7°C) and 50.4°F (10.2°C). As Williamstown transitions into May, the average high-temperature is observed to rise from a refreshing 58.6°F (14.8°C) in April to a pleasant 69.3°F (20.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Williamstown, Pennsylvania, with an average temperature fluctuating between 76.6°F (24.8°C) and 57°F (13.9°C). Williamstown's weather in June presents a minor rise in the average high-temperature, moving from a pleasant 69.3°F (20.7°C) in May to a moderately hot 76.6°F (24.8°C). Weather in June »
Weather in July
July, like June, in Williamstown, Pennsylvania, is another warm summer month, with an average temperature varying between 62.1°F (16.7°C) and 82.2°F (27.9°C). Williamstown's July weather, with an average high temperature of 82.2°F (27.9°C) and an average low temperature of 62.1°F (16.7°C), tends to be the warmest of the year. For July, the heat index is computed to be a tropical 89.6°F (32°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 ranging between min 60.3°F (15.7°C) and max 80.2°F (26.8°C). Upon the beginning of August, Williamstown's high-temperatures register at a still moderately hot 80.2°F (26.8°C), closely mirroring the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Williamstown, Pennsylvania, with an average temperature ranging between max 73.2°F (22.9°C) and min 54.1°F (12.3°C). September brings a slight decrease in temperature, down from a moderately hot 80.2°F (26.8°C) in August to a pleasant 73.2°F (22.9°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Williamstown, Pennsylvania, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 45.3°F (7.4°C). The shift from September to October involves a decrease in the average high-temperature, from an agreeable 73.2°F (22.9°C) to a comfortable 61.3°F (16.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Williamstown, Pennsylvania, with an average temperature fluctuating between 48.7°F (9.3°C) and 34.5°F (1.4°C). In November, the average high-temperature goes from an enjoyable 61.3°F (16.3°C) in October to a frosty 48.7°F (9.3°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Williamstown, Pennsylvania, with an average temperature varying between 39.4°F (4.1°C) and 28.2°F (-2.1°C). Williamstown in December experiences a subtle temperature decline, with average high-temperatures reducing from a frosty 48.7°F (9.3°C) in November to an icy 39.4°F (4.1°C). Weather in December »
[Resources]Frequently asked questions
What are the coldest months in Williamstown?
The month of January sees the average lowest temperatures in Williamstown, reaching 33.4°F (0.8°C) at the peak and 20.8°F (-6.2°C) at the low.
How much does it rain in Williamstown?
In Williamstown, Pennsylvania, during the entire year, the rain falls for 148.4 days and collects up to 25.55" (649mm) of precipitation.
When does it snow in Williamstown?
Months with snowfall are January through May, October through December.
How much does it snow in Williamstown?
In Williamstown, during the entire year, snow falls for 26.2 days and aggregates up to 12.32" (313mm) of snow.
What are the months with the lowest UV index in Williamstown?
The months with the lowest UV index in Williamstown are January through March, November and December, with an average maximum UV index of 2.
What is the most humid month in Williamstown?
With an average relative humidity of 82%, February is the most humid month in Williamstown, Pennsylvania.
What is the driest month in Williamstown?
February is the month with the least rainfall in Williamstown, Pennsylvania. Rain falls for 7.3 days and accumulates 1.54" (39mm) of precipitation.
What is the month with the least sunshine in Williamstown?
With an average of 4.2h of sunshine, February has the least sunshine of the year.
What is the snowiest month in Williamstown?
March is the month with the most snowfall in Williamstown, Pennsylvania. Snow falls for 4.7 days and accumulates 3.43" (87mm) of snow.
When is Daylight Saving Time (DST) in Williamstown?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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?
April is the least humid month in Williamstown, with an average relative humidity of 76%.
What is the wettest month in Williamstown?
The month with the most rainfall in Williamstown is May, when the rain falls for 17.4 days and typically aggregates up to 2.95" (75mm) of precipitation.
When it does not snow in Williamstown?
June through September are months without snowfall in Williamstown, Pennsylvania.
When are the longest days in Williamstown?
The month with the longest days in Williamstown, Pennsylvania, is June, with an average of 15h and 0min of daylight.
When is the highest UV index in Williamstown?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months in Williamstown?
Williamstown's warmest temperatures are experienced in July, with average high temperatures of 82.2°F (27.9°C) and lows of 62.1°F (16.7°C).
What month has the most sunshine in Williamstown?
July has the most sunshine of the year, with an average of 10.3h of sunshine.
What is the month with the shortest days in Williamstown?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Williamstown, PA
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.4°F).
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure
Williamstown, PA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.08"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:
29.97"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Williamstown, PA
- Average wind speed in January:
8mph - Average wind speed in February:
8mph - Average wind speed in March:
8.3mph - Average wind speed in April:
8.3mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.6mph - Average wind speed in September:
5.3mph - Average wind speed in October:
6.6mph - Average wind speed in November:
7mph - Average wind speed in December:
7.5mph
The windiest months (with the highest average wind speed) are March and April (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity
Williamstown, PA
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall
Williamstown, PA
- Average rainfall in January:
1.69" - Average rainfall in February:
1.54" - Average rainfall in March:
1.85" - Average rainfall in April:
2.28" - Average rainfall in May:
2.95" - Average rainfall in June:
2.2"
- Average rainfall in July:
2.68" - Average rainfall in August:
2.68" - Average rainfall in September:
1.81" - Average rainfall in October:
2.17" - Average rainfall in November:
2.05" - Average rainfall in December:
1.65"
The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is February (1.54").
Average rainfall days
Williamstown, PA
- Average rainfall days in January:
7.2 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
15.2 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
17.2 days - Average rainfall days in August:
15.3 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
12.4 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
9.7 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.2 days).
Average snowfall
Williamstown, PA
- Average snowfall in January:
3.39" - Average snowfall in February:
2.48" - Average snowfall in March:
3.43" - Average snowfall in April:
0.31" - Average snowfall in May:
0.2" - Average snowfall in June:
0"
The month with the highest snowfall is March (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Williamstown, PA
- Average snowfall days in January:
6.9 days - Average snowfall days in February:
6.6 days - Average snowfall days in March:
4.7 days - Average snowfall days in April:
0.9 days - Average snowfall days in May:
0.3 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:
0.1 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
4.9 days
The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Williamstown, PA
- 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 3min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h 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 18min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days
Williamstown, PA
- Average sunshine days in January:
18.6 days - Average sunshine days in February:
14.7 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
13.5 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
16.7 days - Average sunshine days in November:
18.8 days - Average sunshine days in December:
18.1 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (10.8 days).
Average UV index
Williamstown, PA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Williamstown, PA
The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility
Williamstown, PA
The months with the highest visibility are January, March, April, June, July, November and December (6mi).
The months with the lowest visibility are February, May, August, September and October (5mi).
Williamstown, Pennsylvania, USA
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