Climate and monthly weather forecastSaint Clair, PA
Climate and monthly weather forecast
Weather in January
January, like December, in Saint Clair, Pennsylvania, is another cold winter month, with an average temperature fluctuating between 20.5°F (-6.4°C) and 32.5°F (0.3°C). January is the month when Saint Clair sees the lowest average temperatures, with a high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C). Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Saint Clair, Pennsylvania, with temperature in the range of an average low of 22.3°F (-5.4°C) and an average high of 36.1°F (2.3°C). Upon the beginning of February, Saint Clair's high-temperatures register at a still wintry 36.1°F (2.3°C), closely mirroring the preceding month. Weather in February »Weather in March
March, the first month of the spring in Saint Clair, is a frosty month, with an average temperature varying between 29.3°F (-1.5°C) and 45.3°F (7.4°C). With the onset of March, the average high-temperature slightly shifts from February's wintry 36.1°F (2.3°C) to a chilly 45.3°F (7.4°C). Weather in March »Weather in April
April in Saint Clair, Pennsylvania, is a refreshing spring month, with an average temperature ranging between min 39.7°F (4.3°C) and max 57.4°F (14.1°C). April indicates a change in the average high-temperature, moving up from a chilly 45.3°F (7.4°C) in March to a mild 57.4°F (14.1°C). Weather in April »Weather in May
May, the last month of the spring in Saint Clair, is an agreeable month, with temperature in the range of an average high of 68.4°F (20.2°C) and an average low of 49.6°F (9.8°C). The beginning of May signals a rise in the average high-temperature, moving from a moderate 57.4°F (14.1°C) in April to an agreeable 68.4°F (20.2°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Saint Clair, Pennsylvania, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 75.7°F (24.3°C). The arrival of June signals a slight increase in the average high-temperature, moving from a pleasant 68.4°F (20.2°C) in May to a moderately hot 75.7°F (24.3°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Saint Clair, Pennsylvania, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 81.5°F (27.5°C). July, recognised by an average high temperature of 81.5°F (27.5°C) and a low of 61.3°F (16.3°C), is Saint Clair's warmest month. Throughout July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Clair, Pennsylvania, with temperature in the range of an average high of 79°F (26.1°C) and an average low of 59.5°F (15.3°C). As July transitions into August, Saint Clair records an average high-temperature of a still moderately hot 79°F (26.1°C), showing a gentle shift from the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Saint Clair, is still a pleasant month, with an average temperature varying between 73°F (22.8°C) and 53.6°F (12°C). September sees a slight reduction in average high-temperature, with a shift from a warm 79°F (26.1°C) in August to a pleasant 73°F (22.8°C). Weather in September »Weather in October
October, like September, in Saint Clair, Pennsylvania, is another refreshing autumn month, with an average temperature fluctuating between 60.8°F (16°C) and 44.6°F (7°C). Saint Clair observes a minor decrease in the average high-temperature with the arrival of October, falling from September's pleasant 73°F (22.8°C) to a comfortable 60.8°F (16°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Saint Clair, Pennsylvania, with temperature in the range of an average low of 33.8°F (1°C) and an average high of 48°F (8.9°C). November's arrival correlates with a reduction in the average high-temperature, down from a refreshing 60.8°F (16°C) in October to a frosty 48°F (8.9°C). Weather in November »Weather in December
December, the first month of the winter in Saint Clair, is also an icy month, with an average temperature ranging between min 27.7°F (-2.4°C) and max 38.8°F (3.8°C). December's arrival comes with a decrease in the average high-temperature, moving from a chilly 48°F (8.9°C) in November to an icy 38.8°F (3.8°C). Weather in December »Updated: Jun 4, 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
In Saint Clair, January is known for its average lowest temperatures, reaching a high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C).
In Saint Clair, during the entire year, the rain falls for 172.9 days and collects up to 34.21" (869mm) of precipitation.
Months with snowfall are January through May, October through December.
January is the month with the most snowfall. Snow falls for 11.8 days and accumulates 5.47" (139mm) of snow.
In Saint Clair, during the entire year, snow falls for 39.7 days and aggregates up to 20.47" (520mm) of snow.
January, February and December, with an average of 4.4h of sunshine, are months with the least sunshine in Saint Clair.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the most humid month, with an average relative humidity of 83%.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Saint Clair, Pennsylvania, 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.
The least humid month is April, with an average relative humidity of 77%.
May is the month with the most rainfall. Rain falls for 18.7 days and accumulates 3.39" (86mm) 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.
Saint Clair, Pennsylvania, reaches its average highest temperatures in July, measuring 81.5°F (27.5°C) at the peak and 61.3°F (16.3°C) at the lowest.
With an average of 10.5h of sunshine, July has the most sunshine of the year.
The month with the highest UV index is July, with an average maximum UV index of 6.
September is the month with the least rainfall in Saint Clair. Rain falls for 12.7 days and accumulates 2.09" (53mm) of precipitation.
December has the shortest days of the year in Saint Clair, Pennsylvania, with an average of 9h and 18min of daylight.
Average temperature
Saint Clair, PA
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32.5°F).
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure
Saint Clair, 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:
30.03"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
Saint Clair, PA
- Average wind speed in January:
8.1mph - Average wind speed in February:
8.1mph - Average wind speed in March:
8.4mph - Average wind speed in April:
8.3mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.9mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.8mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.7mph - Average wind speed in November:
7.2mph - Average wind speed in December:
7.7mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity
Saint Clair, PA
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).
Average rainfall
Saint Clair, PA
- Average rainfall in January:
2.68" - Average rainfall in February:
2.6" - Average rainfall in March:
2.76" - Average rainfall in April:
3.15" - Average rainfall in May:
3.39" - Average rainfall in June:
2.76"
- Average rainfall in July:
3.19" - Average rainfall in August:
3.07" - Average rainfall in September:
2.09" - Average rainfall in October:
2.95" - Average rainfall in November:
2.72" - Average rainfall in December:
2.87"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (2.09").
Average rainfall days
Saint Clair, PA
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
10.9 days - Average rainfall days in March:
14.2 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
18.7 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
16.2 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
13.9 days - Average rainfall days in November:
10.8 days - Average rainfall days in December:
13.5 days
The month with the highest number of rainy days is May (18.7 days).
The months with the least rainy days are January and November (10.8 days).
Average snowfall
Saint Clair, PA
- Average snowfall in January:
5.47" - Average snowfall in February:
4.84" - Average snowfall in March:
4.96" - Average snowfall in April:
0.24" - Average snowfall in May:
0.28" - Average snowfall in June:
0"
The month with the highest snowfall is January (5.47").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Saint Clair, PA
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
10.4 days - Average snowfall days in March:
6.8 days - Average snowfall days in April:
1.3 days - Average snowfall days in May:
0.2 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:
0.2 days - Average snowfall days in November:
2.1 days - Average snowfall days in December:
6.9 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
Saint Clair, 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 48min - 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 24min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 18min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 12min - 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 30min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 24min).
Average sunshine days
Saint Clair, PA
- Average sunshine days in January:
13.3 days - Average sunshine days in February:
10.6 days - Average sunshine days in March:
11.9 days - Average sunshine days in April:
11.4 days - Average sunshine days in May:
9.6 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
10.7 days - Average sunshine days in August:
12.2 days - Average sunshine days in September:
14.9 days - Average sunshine days in October:
13.7 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
14.2 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is May (9.6 days).
Average UV index
Saint Clair, 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
Saint Clair, PA
The months with the most cloud cover are February and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility
Saint Clair, PA
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
