Climate and monthly weather forecastCastle Shannon, PA
Climate and monthly weather forecast
Weather in January
January, like December, in Castle Shannon, Pennsylvania, is an icy winter month, with an average temperature fluctuating between 20.8°F (-6.2°C) and 33.4°F (0.8°C). January proves to be the coldest month, recording an average maximum temperature of 33.4°F (0.8°C) and a minimum temperature of 20.8°F (-6.2°C). Weather in January »Weather in February
The last month of the winter, February, is another cold month in Castle Shannon, Pennsylvania, with an average temperature varying between 23.4°F (-4.8°C) and 37.8°F (3.2°C). Transitioning from January to February, Castle Shannon observes an average high-temperature of a still cold 37.8°F (3.2°C), differing subtly from the previous month. Weather in February »Weather in March
March, the first month of the spring in Castle Shannon, is a chilly month, with an average temperature varying between 31.5°F (-0.3°C) and 47.8°F (8.8°C). Castle Shannon's March weather brings a rise in high-temperatures, moving from a wintry 37.8°F (3.2°C) in February to a chilly 47.8°F (8.8°C). Weather in March »Weather in April
April is a refreshing spring month in Castle Shannon, Pennsylvania, with an average temperature ranging between max 60.6°F (15.9°C) and min 41.7°F (5.4°C). Castle Shannon sees an increase in average high-temperatures during April, moving from a chilly 47.8°F (8.8°C) in March to a mild 60.6°F (15.9°C). Weather in April »Weather in May
May, the last month of the spring in Castle Shannon, is an agreeable month, with an average temperature varying between 72.3°F (22.4°C) and 51.4°F (10.8°C). Castle Shannon's May weather brings a rise in high-temperatures, moving from a refreshing 60.6°F (15.9°C) in April to an agreeable 72.3°F (22.4°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Castle Shannon, Pennsylvania, with an average temperature ranging between min 58.6°F (14.8°C) and max 79.3°F (26.3°C). June marks a minor ascent in the average high-temperature, adjusting from May's pleasant 72.3°F (22.4°C) to a moderately hot 79.3°F (26.3°C). Weather in June »Weather in July
July, like June, in Castle Shannon, Pennsylvania, is another warm summer month, with an average temperature fluctuating between 83.8°F (28.8°C) and 63°F (17.2°C). The month of July, characterized by an average high of 83.8°F (28.8°C) and a low of 63°F (17.2°C), is recognized as the warmest. July's heat index is calculated to be a hot 91.4°F (33°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Castle Shannon, Pennsylvania, with an average temperature ranging between max 82.2°F (27.9°C) and min 61.2°F (16.2°C). Castle Shannon marks the start of August with an average high-temperature of a still moderately hot 82.2°F (27.9°C), hinting at a slight fluctuation from July's 83.8°F (28.8°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Castle Shannon, Pennsylvania, with an average temperature fluctuating between 55.9°F (13.3°C) and 75.7°F (24.3°C). The start of September involves a subtle temperature drop, shifting from a moderately hot 82.2°F (27.9°C) in August to a still warm 75.7°F (24.3°C). Weather in September »Weather in October
October, like September, in Castle Shannon, Pennsylvania, is another refreshing autumn month, with an average temperature ranging between max 62.1°F (16.7°C) and min 45.5°F (7.5°C). October's arrival correlates with a reduction in the average high-temperature, down from a moderately hot 75.7°F (24.3°C) in September to a comfortable 62.1°F (16.7°C). Weather in October »Weather in November
November, the last month of the autumn in Castle Shannon, is also a frosty month, with temperature in the range of an average high of 49.3°F (9.6°C) and an average low of 34.3°F (1.3°C). As November commences, the average high-temperature shows a reduction, transitioning from an enjoyable 62.1°F (16.7°C) in October to a chilly 49.3°F (9.6°C). Weather in November »Weather in December
December, the first month of the winter in Castle Shannon, is also an icy month, with an average temperature fluctuating between 28.2°F (-2.1°C) and 39.7°F (4.3°C). A decrease in the average high-temperature is observed during December, shifting from a chilly 49.3°F (9.6°C) in November to a wintry 39.7°F (4.3°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
January is the coldest month, with the temperature often reaching an average high of 33.4°F (0.8°C) and an average low of 20.8°F (-6.2°C).
January and February, with an average relative humidity of 84%, are most humid months.
Throughout the year, there are 164 rainfall days, and 26.89" (683mm) of precipitation is accumulated.
January through April, October through December are months with snowfall.
The month with the most snowfall is January, when snow falls for 16.3 days and typically aggregates up to 3.46" (88mm) of snow.
In Castle Shannon, during the entire year, snow falls for 53.3 days and aggregates up to 13.27" (337mm) of snow.
With an average of 2.9h of sunshine, January has the least sunshine of the year.
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.
May is the month with the most rainfall. Rain falls for 18.4 days and accumulates 3.07" (78mm) of precipitation.
May through September are months without snowfall.
The month with the longest days is June, with an average of 15h and 0min of daylight.
The months with the highest UV index are June and July, with an average maximum UV index of 6.
The warmest month is July, with an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 63°F (17.2°C).
The least humid month is August, with an average relative humidity of 73%.
August has the most sunshine of the year, with an average of 10.1h of sunshine.
The month with the least rainfall is November, when the rain falls for 10 days and typically collects 1.61" (41mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 24min of daylight.
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Castle Shannon, PA
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (33.4°F).
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure
Castle Shannon, 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:
29.97"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:
30.05"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed
Castle Shannon, PA
- Average wind speed in January:
7.9mph - Average wind speed in February:
7.6mph - Average wind speed in March:
7.3mph - Average wind speed in April:
7.4mph - Average wind speed in May:
6mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5.2mph - Average wind speed in October:
6.3mph - Average wind speed in November:
6.8mph - Average wind speed in December:
7.3mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity
Castle Shannon, PA
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (73%).
Average rainfall
Castle Shannon, PA
- Average rainfall in January:
1.65" - Average rainfall in February:
1.85" - Average rainfall in March:
1.97" - Average rainfall in April:
2.8" - Average rainfall in May:
3.07" - Average rainfall in June:
2.76"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.61").
Average rainfall days
Castle Shannon, PA
- Average rainfall days in January:
8.5 days - Average rainfall days in February:
8.9 days - Average rainfall days in March:
12.4 days - Average rainfall days in April:
16.6 days - Average rainfall days in May:
18.4 days - Average rainfall days in June:
16.7 days
- Average rainfall days in July:
17.7 days - Average rainfall days in August:
16.3 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10 days - Average rainfall days in December:
10.7 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is January (8.5 days).
Average snowfall
Castle Shannon, PA
The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Castle Shannon, PA
- Average snowfall days in January:
16.3 days - Average snowfall days in February:
11.9 days - Average snowfall days in March:
7.3 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0 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:
3.9 days - Average snowfall days in December:
11.8 days
The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Castle Shannon, 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:
2h and 54min - Average sunshine in February:
3h and 30min - Average sunshine in March:
5h and 18min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 18min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 24min - Average sunshine in October:
5h and 12min - Average sunshine in November:
4h and 42min - Average sunshine in December:
3h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days
Castle Shannon, PA
- Average sunshine days in January:
9.7 days - Average sunshine days in February:
9.5 days - Average sunshine days in March:
11.9 days - Average sunshine days in April:
10.9 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
11.9 days
- Average sunshine days in July:
11.7 days - Average sunshine days in August:
13 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.4 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
11 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (9.5 days).
Average UV index
Castle Shannon, PA
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Castle Shannon, PA
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility
Castle Shannon, PA
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
