Climate and monthly weather forecastSwarthmore, PA
Climate and monthly weather forecast
Weather in January
January, like December, in Swarthmore, Pennsylvania, is another cold winter month, with an average temperature ranging between min 25.7°F (-3.5°C) and max 37.4°F (3°C). January, recording an average high temperature of 37.4°F (3°C) and a low temperature of 25.7°F (-3.5°C), is Swarthmore's coldest month. Weather in January »Weather in February
February, the last month of the winter in Swarthmore, is also an icy month, with temperature in the range of an average high of 41.2°F (5.1°C) and an average low of 27.9°F (-2.3°C). February brings an average high-temperature of a still wintry 41.2°F (5.1°C), showing a slight difference from January's 37.4°F (3°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Swarthmore, Pennsylvania, with an average temperature varying between 34.9°F (1.6°C) and 49.6°F (9.8°C). A soft shift in the average high-temperature is noticeable in March, transitioning from a wintry 41.2°F (5.1°C) in February to a chilly 49.6°F (9.8°C). Weather in March »Weather in April
April is a refreshing spring month in Swarthmore, Pennsylvania, with an average temperature fluctuating between 61.5°F (16.4°C) and 45°F (7.2°C). In Swarthmore, the average high-temperature in April rises, from a chilly 49.6°F (9.8°C) in March, to a refreshing 61.5°F (16.4°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Swarthmore, Pennsylvania, with an average temperature fluctuating between 72°F (22.2°C) and 55°F (12.8°C). May's arrival is marked by an increase in the average high-temperature, moving from an enjoyable 61.5°F (16.4°C) in April to a pleasant 72°F (22.2°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Swarthmore, Pennsylvania, with an average temperature varying between 79.7°F (26.5°C) and 63.1°F (17.3°C). The average high-temperature mildly increases in June, edging from an agreeable 72°F (22.2°C) in May to a moderately hot 79.7°F (26.5°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Swarthmore, Pennsylvania, with an average temperature ranging between min 68.7°F (20.4°C) and max 85.6°F (29.8°C). Swarthmore's warmest month, July, generally records average temperatures ranging from a high of 85.6°F (29.8°C) to a low of 68.7°F (20.4°C). For July, the heat index is estimated at a sweltering 95°F (35°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Swarthmore, Pennsylvania, with an average temperature varying between 67.3°F (19.6°C) and 83.5°F (28.6°C). The arrival of August records an average high-temperature of a still warm 83.5°F (28.6°C), closely related to the 85.6°F (29.8°C) observed in July. Weather in August »Weather in September
September, the first month of the autumn in Swarthmore, is still a warm month, with temperature in the range of an average low of 60.8°F (16°C) and an average high of 76.6°F (24.8°C). The onset of September brings a small shift in high-temperatures, falling from 83.5°F (28.6°C) in August to a still moderately hot 76.6°F (24.8°C). Weather in September »Weather in October
October, like September, in Swarthmore, Pennsylvania, is another refreshing autumn month, with an average temperature fluctuating between 64.9°F (18.3°C) and 50.7°F (10.4°C). The onset of October entails a temperature shift, as the average high-temperature decreases from a warm 76.6°F (24.8°C) in September to a comfortable 64.9°F (18.3°C). Weather in October »Weather in November
November, the last month of the autumn in Swarthmore, is also a fresh month, with an average temperature varying between 52.7°F (11.5°C) and 39.2°F (4°C). Swarthmore in November undergoes a mild reduction in the average high-temperature, shifting from October's enjoyable 64.9°F (18.3°C) to a cool 52.7°F (11.5°C). Weather in November »Weather in December
December, the first month of the winter in Swarthmore, is also a frosty month, with an average temperature fluctuating between 44.1°F (6.7°C) and 32.9°F (0.5°C). December signifies a minor drop in average high-temperature, transitioning from a fresh 52.7°F (11.5°C) in November to a frosty 44.1°F (6.7°C). Weather in December »Updated: Aug 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
Swarthmore records the coldest temperatures in January, averaging a high of 37.4°F (3°C) and a low of 25.7°F (-3.5°C).
January is the month with the least rainfall. Rain falls for 7.1 days and accumulates 1.61" (41mm) of precipitation.
Throughout the year, in Swarthmore, there are 148.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.
Months with snowfall are January through May, November and December.
Throughout the year, there are 12.6 snowfall days, and 7.28" (185mm) of snow is accumulated.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Swarthmore, Pennsylvania.
February, October and December, with an average relative humidity of 77%, are most humid months.
February has the least sunshine of the year, with an average of 4.9h of sunshine.
The month with the most snowfall is March, when snow falls for 3 days and typically aggregates up to 2.32" (59mm) 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.
April is the least humid month, with an average relative humidity of 71%.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
In Swarthmore, snow does not fall in June through October.
The month with the longest days in Swarthmore is June, with an average of 15h and 0min of daylight.
July is the month that records the highest temperatures, with averages ranging from a high of 85.6°F (29.8°C) to a low of 68.7°F (20.4°C).
July has the most sunshine of the year, with an average of 10.7h of sunshine.
August is the month with the most rainfall in Swarthmore. Rain falls for 16.1 days and accumulates 3.11" (79mm) of precipitation.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Swarthmore, PA
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure
Swarthmore, PA
- 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:
29.99"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
Swarthmore, PA
- 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:
8.5mph - Average wind speed in May:
6.8mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.9mph - Average wind speed in October:
7.2mph - Average wind speed in November:
7.6mph - Average wind speed in December:
7.9mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity
Swarthmore, PA
The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall
Swarthmore, PA
- Average rainfall in January:
1.61" - Average rainfall in February:
1.73" - Average rainfall in March:
2.28" - Average rainfall in April:
2.01" - Average rainfall in May:
2.32" - Average rainfall in June:
2.28"
- Average rainfall in July:
2.68" - Average rainfall in August:
3.11" - Average rainfall in September:
1.73" - Average rainfall in October:
1.97" - Average rainfall in November:
1.89" - Average rainfall in December:
2.32"
The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days
Swarthmore, PA
- Average rainfall days in January:
7.1 days - Average rainfall days in February:
8.2 days - Average rainfall days in March:
13.2 days - Average rainfall days in April:
13.4 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
15.4 days
- Average rainfall days in July:
17 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
12.6 days - Average rainfall days in October:
11.7 days - Average rainfall days in November:
8.7 days - Average rainfall days in December:
8.7 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).
Average snowfall
Swarthmore, PA
- Average snowfall in January:
1.73" - Average snowfall in February:
1.61" - Average snowfall in March:
2.32" - Average snowfall in April:
0.2" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days
Swarthmore, PA
- Average snowfall days in January:
3.5 days - Average snowfall days in February:
3.8 days - Average snowfall days in March:
3 days - Average snowfall days in April:
0.3 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:
0.4 days - Average snowfall days in December:
1.5 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
Swarthmore, 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 24min - 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 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 24min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 30min - Average sunshine in May:
8h and 42min - Average sunshine in June:
10h and 6min
- Average sunshine in July:
10h and 42min - Average sunshine in August:
10h and 18min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 42min - Average sunshine in December:
5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days
Swarthmore, PA
- Average sunshine days in January:
20.8 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
15.3 days - Average sunshine days in May:
12.7 days - Average sunshine days in June:
12.5 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
12.5 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
20.3 days - Average sunshine days in December:
20.5 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index
Swarthmore, PA
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
Swarthmore, PA
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility
Swarthmore, PA
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).
