Climate and monthly weather forecast
Williamstown, PA

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Weather in January

January, the same as December, is a wintry winter month in Williamstown, Pennsylvania, with an average temperature ranging between max 33.4°F (0.8°C) and min 20.8°F (-6.2°C). January, with average temperatures reaching a high of 33.4°F (0.8°C) and a low of 20.8°F (-6.2°C), is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is another cold month in Williamstown, Pennsylvania, with an average temperature varying between 22.5°F (-5.3°C) and 36.9°F (2.7°C). The average high-temperature in February, at a still wintry 36.9°F (2.7°C), reveals a modest deviation from January's 33.4°F (0.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Williamstown, Pennsylvania, with temperature in the range of an average low of 30.6°F (-0.8°C) and an average high of 46.4°F (8°C). March brings a temperature change, with average high-temperatures moving from February's cold 36.9°F (2.7°C) to a chilly 46.4°F (8°C). Weather in March »

Weather in April

April is a moderate spring month in Williamstown, Pennsylvania, with an average temperature varying between 58.6°F (14.8°C) and 40.3°F (4.6°C). The shift into April is marked by a rise in the average high-temperature, moving from March's frosty 46.4°F (8°C) to a refreshing 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 temperature in the range of an average low of 50.4°F (10.2°C) and an average high of 69.3°F (20.7°C). May's arrival is marked by an increase in the average high-temperature, moving from a mild 58.6°F (14.8°C) in April to an agreeable 69.3°F (20.7°C). Weather in May »

Weather in June

June, the first month of the summer in Williamstown, is a warm month, with an average temperature fluctuating between 57°F (13.9°C) and 76.6°F (24.8°C). Williamstown's weather in June shows a minor rise in the average high-temperature, moving slightly up from May's pleasant 69.3°F (20.7°C) to a moderately hot 76.6°F (24.8°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Williamstown, Pennsylvania, with an average temperature fluctuating between 62.1°F (16.7°C) and 82.2°F (27.9°C). Williamstown's July weather, marked by an average high temperature of 82.2°F (27.9°C) and an average low temperature of 62.1°F (16.7°C), is the warmest in the year. The heat index in July is calculated to be a tropical 89.6°F (32°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Williamstown, Pennsylvania, with an average temperature ranging between max 80.2°F (26.8°C) and min 60.3°F (15.7°C). The initiation of August records an average high-temperature of a still warm 80.2°F (26.8°C), displaying a near consistency with the previous month. Weather in August »

Weather in September

September, the first month of the autumn in Williamstown, is still a pleasant month, with an average temperature fluctuating between 73.2°F (22.9°C) and 54.1°F (12.3°C). September ushers in a minute temperature change, with average high-temperatures reducing from August's moderately hot 80.2°F (26.8°C) to an agreeable 73.2°F (22.9°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Williamstown, Pennsylvania, with an average temperature fluctuating between 45.3°F (7.4°C) and 61.3°F (16.3°C). October is characterized by a reduction in the average high-temperature, from a pleasant 73.2°F (22.9°C) in September 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 34.5°F (1.4°C) and 48.7°F (9.3°C). In November, the average high-temperature decreases from an enjoyable 61.3°F (16.3°C) in October to a chilly 48.7°F (9.3°C). Weather in November »

Weather in December

December, the first month of the winter in Williamstown, is also an icy month, with an average temperature fluctuating between 39.4°F (4.1°C) and 28.2°F (-2.1°C). The beginning of December involves a decrease in the average high-temperature, transitioning from a frosty 48.7°F (9.3°C) in November to a cold 39.4°F (4.1°C). Weather in December »
Updated: Jul 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

Temperature readings reach their annual highs in January, averaging 33.4°F (0.8°C) and a minimum average of 20.8°F (-6.2°C).

How much does it rain?

Throughout the year, there are 148.4 rainfall days, and 25.55" (649mm) of precipitation is accumulated.

When does it snow?

January through May, October through December are months with snowfall.

How much does it snow?

Throughout the year, there are 26.2 snowfall days, and 12.32" (313mm) of snow is accumulated.

What are the months with the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the most humid month?

February is the most humid month, with an average relative humidity of 82%.

What is the driest month?

February is the month with the least rainfall. Rain falls for 7.3 days and accumulates 1.54" (39mm) of precipitation.

What is the month with the least sunshine?

With an average of 4.2h of sunshine, February has the least sunshine of the year in Williamstown.

When does it snow the most in Williamstown?

March is the month with the most snowfall. Snow falls for 4.7 days and accumulates 3.43" (87mm) of snow.

When is Daylight Saving Time (DST)?

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?

With an average relative humidity of 76%, April is the least humid month.

What is the wettest month?

May is the month with the most rainfall in Williamstown. Rain falls for 17.4 days and accumulates 2.95" (75mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

When are the longest days?

June has the longest days of the year, with an average of 15h and 0min of daylight.

When is the highest UV index?

The months with the highest UV index are June and July, with an average maximum UV index of 6.

What month is the hottest in Williamstown?

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.

What month has the most sunshine?

The month with the most sunshine is July, with an average of 10.3h of sunshine.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

Average temperature
Williamstown, PA

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 - Williamstown, PA

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 - Williamstown, PA

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

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 - Williamstown, PA

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 - Williamstown, PA

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 - Williamstown, PA

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 - Williamstown, PA

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 / Average sunshine - Williamstown, PA

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).

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 - Williamstown, PA

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

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 visibility
Williamstown, PA

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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