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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, in South Williamsport, Pennsylvania, is a freezing cold winter month, with an average temperature fluctuating between 30.6°F (-0.8°C) and 18.9°F (-7.3°C). January, noted for its average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 18.9°F (-7.3°C), is considered the coldest month. Weather in January »
Weather in February
February, the last month of the winter in South Williamsport, is a cold month, with an average temperature ranging between max 34.5°F (1.4°C) and min 20.7°F (-6.3°C). South Williamsport's February reports an average high-temperature of an icy 34.5°F (1.4°C), exhibiting a minor difference from January. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in South Williamsport, Pennsylvania, with an average temperature ranging between min 27.7°F (-2.4°C) and max 44.2°F (6.8°C). The start of March signals an increase in the average high-temperature, moving from a cold 34.5°F (1.4°C) in February to a frosty 44.2°F (6.8°C). Weather in March »
Weather in April
April is a moderate spring month in South Williamsport, Pennsylvania, with temperature in the range of an average low of 37.8°F (3.2°C) and an average high of 56.5°F (13.6°C). In South Williamsport, the onset of April comes with an increased average high-temperature, moving from March's frosty 44.2°F (6.8°C) to a moderate 56.5°F (13.6°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in South Williamsport, Pennsylvania, with an average temperature varying between 68.4°F (20.2°C) and 48°F (8.9°C). The commencement of May sees a shift in the average high-temperature, moving from a mild 56.5°F (13.6°C) in April to an agreeable 68.4°F (20.2°C). Weather in May »
Weather in June
June, the first month of the summer in South Williamsport, is a warm month, with an average temperature ranging between min 54.7°F (12.6°C) and max 76.1°F (24.5°C). As South Williamsport enters June, the average high-temperature marginally increases from the a pleasant 68.4°F (20.2°C) of May to a warm 76.1°F (24.5°C). Weather in June »
Weather in July
July, like June, in South Williamsport, Pennsylvania, is a moderately hot summer month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 59.2°F (15.1°C). Temperature records mark July as the warmest month, with highs averaging 81.7°F (27.6°C) and lows at 59.2°F (15.1°C). In July, the heat index is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in South Williamsport, is another warm month, with temperature in the range of an average low of 57.2°F (14°C) and an average high of 79.2°F (26.2°C). The initiation of August records an average high-temperature of a still warm 79.2°F (26.2°C), displaying a near consistency with the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in South Williamsport, Pennsylvania, with an average temperature varying between 72.1°F (22.3°C) and 51.4°F (10.8°C). The onset of September brings a small shift in high-temperatures, falling from a warm 79.2°F (26.2°C) in August to a pleasant 72.1°F (22.3°C). Weather in September »
Weather in October
October, the same as September, in South Williamsport, Pennsylvania, is another refreshing autumn month, with temperature in the range of an average low of 42.6°F (5.9°C) and an average high of 59.4°F (15.2°C). A decrease in the average high-temperature is observed during October, shifting from an agreeable 72.1°F (22.3°C) in September to a mild 59.4°F (15.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in South Williamsport, Pennsylvania, with an average temperature varying between 46.2°F (7.9°C) and 32.4°F (0.2°C). November involves a decrease in temperature, down from a mild 59.4°F (15.2°C) in October to a chilly 46.2°F (7.9°C). Weather in November »
Weather in December
December, the first month of the winter in South Williamsport, is also an icy month, with an average temperature varying between 36.7°F (2.6°C) and 26.6°F (-3°C). The move into December indicates a reduction in the average high-temperature, down from November's frosty 46.2°F (7.9°C) to a wintry 36.7°F (2.6°C). Weather in December »
Updated: Jun 5, 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 time of the year is the coldest?
With average temperatures fluctuating between a high of 30.6°F (-0.8°C) and a low of 18.9°F (-7.3°C), January stands out as the coldest month.
How many days does it rain?
Throughout the year, there are 145.2 rainfall days, and 16.57" (421mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
How many days does it snow?
Throughout the year, there are 39.1 snowfall days, and 7.56" (192mm) of snow is accumulated.
What is the month with the least sunshine?
January and February, with an average of 3.7h of sunshine, are months with the least sunshine.
When is the lowest UV index?
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
What is the most humid month?
With an average relative humidity of 84%, February is the most humid month.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 10.1 days and accumulates 2.28" (58mm) of snow.
When is Daylight Saving Time (DST) in South Williamsport?
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?
April and July, with an average relative humidity of 77%, are the least humid months.
What is the rainiest month?
The month with the most rainfall in South Williamsport is April, when the rain falls for 15 days and typically aggregates up to 1.93" (49mm) of precipitation.
When it does not snow?
In South Williamsport, snow does not fall in May through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What are the warmest months in South Williamsport?
South Williamsport experiences its average highest temperatures in July, reaching a peak of 81.7°F (27.6°C) and a minimum of 59.2°F (15.1°C).
What month has the most sunshine?
With an average of 10.1h of sunshine, July has the most sunshine of the year.
What is the month with the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What is the driest month?
The month with the least rainfall is November, when the rain falls for 8.6 days and typically collects 0.94" (24mm) of precipitation.
What is the month with the shortest days?
The month with the shortest days in South Williamsport is December, with an average of 9h and 18min of daylight.
Average temperature
South Williamsport, PA
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
South Williamsport, 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:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.07"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.09"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
South Williamsport, PA
- Average wind speed in January:
7.5mph - Average wind speed in February:
7.3mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.5mph - Average wind speed in May:
6.2mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.8mph - Average wind speed in September:
5.3mph - Average wind speed in October:
6.3mph - Average wind speed in November:
6.7mph - Average wind speed in December:
7mph
The windiest months (with the highest average wind speed) are January, March and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity
South Williamsport, PA
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall
South Williamsport, PA
- Average rainfall in January:
0.98" - Average rainfall in February:
0.98" - Average rainfall in March:
1.1" - Average rainfall in April:
1.93" - Average rainfall in May:
1.85" - Average rainfall in June:
1.57"
The wettest month (with the highest rainfall) is April (1.93").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days
South Williamsport, PA
- Average rainfall days in January:
8.4 days - Average rainfall days in February:
7.5 days - Average rainfall days in March:
11 days - Average rainfall days in April:
15 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
14.7 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
14 days - Average rainfall days in September:
11.2 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
8.6 days - Average rainfall days in December:
10.6 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (7.5 days).
Average snowfall
South Williamsport, PA
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
South Williamsport, PA
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
10.1 days - Average snowfall days in March:
5.3 days - Average snowfall days in April:
0.9 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:
0.3 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
8.1 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
South Williamsport, 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 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - 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 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
10h and 1min - 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 0min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days
South Williamsport, PA
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
16.2 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
13 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
16.8 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
18.7 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (11.8 days).
Average UV index
South Williamsport, PA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
South Williamsport, PA
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility
South Williamsport, PA
The month with the highest visibility is April (6mi).
The month with the lowest visibility is September (4mi).
South Williamsport, Pennsylvania, USA
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