Expand
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 an icy winter month in Southwest, Pennsylvania, with an average temperature fluctuating between 33.3°F (0.7°C) and 20.3°F (-6.5°C). Temperature records mark January as the coldest month, with highs averaging 33.3°F (0.7°C) and lows at 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 an average temperature ranging between min 23.2°F (-4.9°C) and max 37.4°F (3°C). The commencement of February introduces an average high-temperature of a still wintry 37.4°F (3°C), closely mirroring the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Southwest, Pennsylvania, with an average temperature fluctuating between 46.8°F (8.2°C) and 30.7°F (-0.7°C). The beginning of March marks a shift in the average high-temperature, moving from February's cold 37.4°F (3°C) to a frosty 46.8°F (8.2°C). Weather in March »
Weather in April
April is a mild spring month in Southwest, Pennsylvania, with an average temperature ranging between min 40.6°F (4.8°C) and max 59.5°F (15.3°C). With the onset of April, Southwest's average high-temperature sees a rise, moving from March's chilly 46.8°F (8.2°C) to a mild 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 fluctuating between 70.7°F (21.5°C) and 50°F (10°C). The average high-temperature increases in May, moving from a moderate 59.5°F (15.3°C) in April to an agreeable 70.7°F (21.5°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Southwest, Pennsylvania, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 56.5°F (13.6°C). With the onset of June, Southwest's average high-temperature experiences a slight rise, moving from May's pleasant 70.7°F (21.5°C) to a moderately hot 77.4°F (25.2°C). Weather in June »
Weather in July
July, like June, in Southwest, Pennsylvania, is another warm summer month, with an average temperature varying between 82°F (27.8°C) and 60.4°F (15.8°C). July tends to be the warmest month, with temperatures averaging a daily high of 82°F (27.8°C) and a low of 60.4°F (15.8°C). The heat index in July is appraised at a tropical 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Southwest, Pennsylvania, with an average temperature varying between 80.6°F (27°C) and 58.6°F (14.8°C). The commencement of August notes an average high-temperature of a still warm 80.6°F (27°C), exhibiting little difference from the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Southwest, is still a warm month, with an average temperature varying between 54.1°F (12.3°C) and 74.3°F (23.5°C). September's arrival subtly correlates with a reduction in the average high-temperature, down from 80.6°F (27°C) in August to a still warm 74.3°F (23.5°C). Weather in September »
Weather in October
October, like September, in Southwest, Pennsylvania, is another enjoyable autumn month, with an average temperature varying between 44.8°F (7.1°C) and 61.3°F (16.3°C). Onset of October comes with a temperature decline, the average high falling from a warm 74.3°F (23.5°C) in September to an enjoyable 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 Southwest, Pennsylvania, with an average temperature ranging between max 48.9°F (9.4°C) and min 33.6°F (0.9°C). The average high-temperature drops in November, from October's comfortable 61.3°F (16.3°C) to a chilly 48.9°F (9.4°C). Weather in November »
Weather in December
December, the first month of the winter in Southwest, is also an icy month, with an average temperature fluctuating between 39.2°F (4°C) and 27.7°F (-2.4°C). December comes with a drop in the average high-temperature, falling from November's frosty 48.9°F (9.4°C) to a wintry 39.2°F (4°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Southwest?
The month of January sees the average lowest temperatures, reaching 33.3°F (0.7°C) at the peak and 20.3°F (-6.5°C) at the low.
What are the most humid months in Southwest?
The months with the highest humidity are January and February, with an average relative humidity of 85%.
How much does it rain in Southwest?
In Southwest, during the entire year, the rain falls for 185.4 days and collects up to 34.02" (864mm) of precipitation.
When does it snow in Southwest?
Months with snowfall in Southwest are January through May, October through December.
When does it snow the most in Southwest?
January is the month with the most snowfall in Southwest, Pennsylvania. Snow falls for 17.3 days and accumulates 7.09" (180mm) of snow.
How many days does it snow in Southwest?
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 in Southwest?
The month with the least sunshine in Southwest is January, with an average of 3h of sunshine.
When is the lowest UV index in Southwest?
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) in Southwest?
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 in Southwest?
April, July and August, with an average relative humidity of 77%, are the least humid months in Southwest, Pennsylvania.
What is the rainiest month in Southwest?
May is the month with the most rainfall in Southwest. Rain falls for 22 days and accumulates 3.66" (93mm) of precipitation.
When it does not snow in Southwest?
In Southwest, Pennsylvania, snow does not fall in June through September.
When are the longest days in Southwest?
With an average of 15h and 0min of daylight, June has the longest days of the year in Southwest.
What part of the year is the hottest in Southwest?
Southwest notes the warmest temperatures in July, with a average high of 82°F (27.8°C) and a low of 60.4°F (15.8°C).
When is the highest UV index in Southwest?
The month with the highest UV index is July, with an average maximum UV index of 6.
What month has the most sunshine in Southwest?
The month with the most sunshine in Southwest is August, with an average of 10h of sunshine.
What is the driest month in Southwest?
November is the month with the least rainfall in Southwest. Rain falls for 12.1 days and accumulates 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
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
