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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, is a wintry winter month in Southwest, Pennsylvania, with an average temperature varying between 33.3°F (0.7°C) and 20.3°F (-6.5°C). January stands out as Southwest's coldest month, with temperatures ranging between an average high of 33.3°F (0.7°C) and a low of 20.3°F (-6.5°C). Weather in January »
Weather in February
February, the last month of the winter in Southwest, is also an icy month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 37.4°F (3°C). February's advent denotes a minor fluctuation in the average high-temperature to a still wintry 37.4°F (3°C) from January's 33.3°F (0.7°C). Weather in February »
Weather in March
March, the first month of the spring in Southwest, is a chilly month, with an average temperature fluctuating between 46.8°F (8.2°C) and 30.7°F (-0.7°C). As March sets, the average high-temperature shows an increase, moving up from a wintry 37.4°F (3°C) in February to a frosty 46.8°F (8.2°C). Weather in March »
Weather in April
April in Southwest, Pennsylvania, is a refreshing spring month, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 59.5°F (15.3°C). The start of April brings a rise in the average high-temperature, moving from a frosty 46.8°F (8.2°C) in March to a moderate 59.5°F (15.3°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Southwest, Pennsylvania, with an average temperature ranging between max 70.7°F (21.5°C) and min 50°F (10°C). An increase in the average high-temperature marks May, moving from April's refreshing 59.5°F (15.3°C) to an agreeable 70.7°F (21.5°C). Weather in May »
Weather in June
June, the first month of the summer in Southwest, is a warm month, with an average temperature fluctuating between 56.5°F (13.6°C) and 77.4°F (25.2°C). With the onset of June, the average high-temperature subtly transitions from an agreeable 70.7°F (21.5°C) in May to a warm 77.4°F (25.2°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Southwest, Pennsylvania, with an average temperature fluctuating between 82°F (27.8°C) and 60.4°F (15.8°C). July, noted for its average high-temperature of 82°F (27.8°C) and an average low-temperature of 60.4°F (15.8°C), is considered the warmest month. The heat index in July is computed to be a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Southwest, is also a moderately hot month, with temperature in the range of an average high of 80.6°F (27°C) and an average low of 58.6°F (14.8°C). As July transitions into August, Southwest records an average high-temperature of a still moderately hot 80.6°F (27°C), showing a gentle shift from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Southwest, Pennsylvania, with an average temperature fluctuating between 54.1°F (12.3°C) and 74.3°F (23.5°C). With the onset of September, the average high-temperature subtly recedes from August's 80.6°F (27°C) to a still moderately hot 74.3°F (23.5°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Southwest, Pennsylvania, with an average temperature fluctuating between 44.8°F (7.1°C) and 61.3°F (16.3°C). Southwest's weather in October involves a decrease in the average high-temperature, moving down from September's moderately hot 74.3°F (23.5°C) to an enjoyable 61.3°F (16.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Southwest, Pennsylvania, with an average temperature fluctuating between 33.6°F (0.9°C) and 48.9°F (9.4°C). November suggests a modest reduction in the average high-temperature, shifting from an enjoyable 61.3°F (16.3°C) in October to a frosty 48.9°F (9.4°C). Weather in November »
Weather in December
December, the first month of the winter in Southwest, is still a cold month, with an average temperature varying between 27.7°F (-2.4°C) and 39.2°F (4°C). December brings a drop in Southwest's average high-temperature, falling from a chilly 48.9°F (9.4°C) in November to an icy 39.2°F (4°C). Weather in December »
Updated: Jul 21, 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 are the coldest months in Southwest?
The coldest period is January, when temperatures fluctuate between an average high of 33.3°F (0.7°C) and a low of 20.3°F (-6.5°C).
What is the most humid month?
January and February, with an average relative humidity of 85%, are most humid months.
How many days does it rain?
Throughout the year, there are 185.4 rainfall days, and 34.02" (864mm) of precipitation is accumulated.
When does it snow in Southwest?
January through May, October through December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 17.3 days and accumulates 7.09" (180mm) of snow.
How many days does it snow?
In Southwest, during the entire year, snow falls for 63.2 days and aggregates up to 29.02" (737mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine in Southwest is January, with an average of 3h of sunshine.
When is the lowest UV index?
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
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?
The months with the lowest humidity in Southwest are April, July and August, with an average relative humidity of 77%.
What is the wettest month?
May is the month with the most rainfall. Rain falls for 22 days and accumulates 3.66" (93mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days in Southwest?
June has the longest days of the year, with an average of 15h and 0min of daylight.
What month is the hottest?
In Southwest, July is the month with the highest recorded average temperatures, measuring a high of 82°F (27.8°C) and a low of 60.4°F (15.8°C).
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10h of sunshine.
What is the driest month?
The month with the least rainfall is November, when the rain falls for 12.1 days and typically collects 2.01" (51mm) of precipitation.
What is the month with the shortest days in Southwest?
With an average of 9h and 24min of daylight, December has the shortest days of the year.
Average temperature
Southwest, PA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure
Southwest, PA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.98"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:
30.14"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed
Southwest, PA
- Average wind speed in January:
8.5mph - Average wind speed in February:
8.2mph - Average wind speed in March:
7.7mph - Average wind speed in April:
7.8mph - Average wind speed in May:
6.4mph - 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:
6.5mph - Average wind speed in November:
7.1mph - Average wind speed in December:
7.9mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity
Southwest, PA
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall
Southwest, PA
- Average rainfall in January:
2.68" - Average rainfall in February:
2.91" - Average rainfall in March:
2.91" - Average rainfall in April:
3.23" - Average rainfall in May:
3.66" - Average rainfall in June:
3.03"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.01").
Average rainfall days
Southwest, PA
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
10.4 days - Average rainfall days in March:
14.5 days - Average rainfall days in April:
18.2 days - Average rainfall days in May:
22 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
19.1 days - Average rainfall days in August:
17.4 days - Average rainfall days in September:
15.3 days - Average rainfall days in October:
16.2 days - Average rainfall days in November:
12.1 days - Average rainfall days in December:
13.1 days
The month with the highest number of rainy days is May (22 days).
The month with the least rainy days is January (9.8 days).
Average snowfall
Southwest, PA
- Average snowfall in January:
7.09" - Average snowfall in February:
6.06" - Average snowfall in March:
5.08" - Average snowfall in April:
1.1" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is January (7.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Southwest, PA
- Average snowfall days in January:
17.3 days - Average snowfall days in February:
13.9 days - Average snowfall days in March:
9.2 days - Average snowfall days in April:
2.9 days - Average snowfall days in May:
0.4 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:
0.6 days - Average snowfall days in November:
6.1 days - Average snowfall days in December:
12.8 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Southwest, 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 2min - 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 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - 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 24min).
- Average sunshine in January:
3h - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 3min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 2min - Average sunshine in November:
4h and 5min - Average sunshine in December:
3h and 4min
The month with the most sunshine is August (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 3h).
Average sunshine days
Southwest, PA
- Average sunshine days in January:
6.5 days - Average sunshine days in February:
6.8 days - Average sunshine days in March:
8.8 days - Average sunshine days in April:
9.8 days - Average sunshine days in May:
8 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
11.7 days - Average sunshine days in September:
13.3 days - Average sunshine days in October:
12.4 days - Average sunshine days in November:
13.5 days - Average sunshine days in December:
9.7 days
The month with the most sunshine days is November (13.5 days).
The month with the least sunshine days is January (6.5 days).
Average UV index
Southwest, PA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Southwest, PA
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility
Southwest, PA
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January and February (4mi).
Southwest, Pennsylvania, USA
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