Climate and monthly weather forecastWilliamstown, PA
Climate and monthly weather forecast
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
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Throughout the year, there are 148.4 rainfall days, and 25.55" (649mm) of precipitation is accumulated.
January through May, October through December are months with snowfall.
Throughout the year, there are 26.2 snowfall days, and 12.32" (313mm) of snow is accumulated.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
February is the most humid month, with an average relative humidity of 82%.
February is the month with the least rainfall. Rain falls for 7.3 days and accumulates 1.54" (39mm) of precipitation.
With an average of 4.2h of sunshine, February has the least sunshine of the year in Williamstown.
March is the month with the most snowfall. Snow falls for 4.7 days and accumulates 3.43" (87mm) of snow.
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.
With an average relative humidity of 76%, April is the least humid month.
May is the month with the most rainfall in Williamstown. Rain falls for 17.4 days and accumulates 2.95" (75mm) of precipitation.
June through September are months without snowfall.
June has the longest days of the year, with an average of 15h and 0min of daylight.
The months with the highest UV index are June and July, with an average maximum UV index of 6.
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.
The month with the most sunshine is July, with an average of 10.3h of sunshine.
With an average of 9h and 18min of daylight, December has the shortest days of the year.
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 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
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 18min - Average sunshine in February:
4h and 12min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 12min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 42min - Average sunshine in October:
5h and 6min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 24min
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).
