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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, like December, in Rosslyn Farms, Pennsylvania, is a wintry winter month, with an average temperature varying between 21°F (-6.1°C) and 33.4°F (0.8°C). January, characterized by an average high temperature of 33.4°F (0.8°C) and a low temperature of 21°F (-6.1°C), is generally the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also an icy month in Rosslyn Farms, Pennsylvania, with temperature in the range of an average high of 37.8°F (3.2°C) and an average low of 23.4°F (-4.8°C). Rosslyn Farms starts February with an average high-temperature of a still wintry 37.8°F (3.2°C), a minor shift from January's 33.4°F (0.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Rosslyn Farms, Pennsylvania, with an average temperature varying between 31.5°F (-0.3°C) and 47.8°F (8.8°C). Rosslyn Farms's weather shows a temperature rise with the arrival of March, moving from a cold 37.8°F (3.2°C) in February to a chilly 47.8°F (8.8°C). Weather in March »
Weather in April
April in Rosslyn Farms, Pennsylvania, is a mild spring month, with an average temperature fluctuating between 41.4°F (5.2°C) and 60.6°F (15.9°C). April shows a rise in the average high-temperature, moving from March's frosty 47.8°F (8.8°C) to a mild 60.6°F (15.9°C). Weather in April »
Weather in May
May, the last month of the spring in Rosslyn Farms, is an agreeable month, with an average temperature ranging between min 51.3°F (10.7°C) and max 72.3°F (22.4°C). The shift into May is characterized by a rise in the average high-temperature, transitioning from April's moderate 60.6°F (15.9°C) 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 Rosslyn Farms, Pennsylvania, with an average temperature fluctuating between 79°F (26.1°C) and 58.3°F (14.6°C). The start of June is characterized by a subtle increase in the average high-temperature, transitioning from an agreeable 72.3°F (22.4°C) in May to a warm 79°F (26.1°C). Weather in June »
Weather in July
July, like June, in Rosslyn Farms, Pennsylvania, is a moderately hot summer month, with an average temperature ranging between min 62.2°F (16.8°C) and max 83.7°F (28.7°C). The highest temperatures are recorded in July, with averages reaching a high of 83.7°F (28.7°C) and a low of 62.2°F (16.8°C). July's average 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 Rosslyn Farms, Pennsylvania, with an average temperature ranging between min 60.8°F (16°C) and max 82.4°F (28°C). The onset of August manifests an average high-temperature of a still moderately hot 82.4°F (28°C), demonstrating a minor variation from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Rosslyn Farms, Pennsylvania, with an average temperature ranging between min 55.8°F (13.2°C) and max 75.7°F (24.3°C). With the arrival of September, Rosslyn Farms experiences a modest decline in average high-temperatures, transitioning from a moderately hot 82.4°F (28°C) in August to a still warm 75.7°F (24.3°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Rosslyn Farms, Pennsylvania, with temperature in the range of an average low of 45.3°F (7.4°C) and an average high of 62.1°F (16.7°C). Rosslyn Farms's transition into October involves a shift in temperature, receding 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 Rosslyn Farms, is another chilly month, with temperature in the range of an average high of 49.3°F (9.6°C) and an average low of 34.2°F (1.2°C). The average high-temperature drops in November, from October's comfortable 62.1°F (16.7°C) to a chilly 49.3°F (9.6°C). Weather in November »
Weather in December
December, the first month of the winter in Rosslyn Farms, is also an icy month, with an average temperature varying between 39.7°F (4.3°C) and 28.4°F (-2°C). The shift to December brings a decrease in the average high-temperature, falling from a chilly 49.3°F (9.6°C) in November to a wintry 39.7°F (4.3°C). Weather in December »
Updated: Aug 20, 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 time of the year is the coldest?
In Rosslyn Farms, January is the coldest month, with temperatures averaging a high of 33.4°F (0.8°C) and a low of 21°F (-6.1°C).
How much does it rain in Rosslyn Farms?
Throughout the year, there are 132.6 rainfall days, and 11.5" (292mm) of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
How many days does it snow?
In Rosslyn Farms, Pennsylvania, during the entire year, snow falls for 32.5 days and aggregates up to 3.66" (93mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3h of sunshine.
What is the most humid month?
February is the most humid month, with an average relative humidity of 85%.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 7.8 days and accumulates 0.98" (25mm) of snow.
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.
When it does not snow?
May through October are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 0min of daylight.
When is the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the hottest time of year?
July, with average temperatures reaching a high of 83.7°F (28.7°C) and a low of 62.2°F (16.8°C), is the warmest month.
What is the least humid month?
The months with the lowest humidity are July and August, with an average relative humidity of 75%.
What is the wettest month?
July is the month with the most rainfall. Rain falls for 15.6 days and accumulates 1.34" (34mm) of precipitation.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.2h of sunshine.
What is the driest month?
November is the month with the least rainfall. Rain falls for 7.7 days and accumulates 0.67" (17mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
What is the month with the lowest UV index?
With an average maximum UV index of 1, December is the month with the lowest UV index.
Average temperature
Rosslyn Farms, PA
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.4°F).
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure
Rosslyn Farms, 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
Rosslyn Farms, 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:
5.6mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5.1mph - Average wind speed in October:
6.2mph - 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 months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity
Rosslyn Farms, PA
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall
Rosslyn Farms, PA
- Average rainfall in January:
0.71" - Average rainfall in February:
0.79" - Average rainfall in March:
0.83" - Average rainfall in April:
1.22" - Average rainfall in May:
1.22" - Average rainfall in June:
1.26"
- Average rainfall in July:
1.34" - Average rainfall in August:
0.98" - Average rainfall in September:
0.79" - Average rainfall in October:
0.83" - Average rainfall in November:
0.67" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is November (0.67").
Average rainfall days
Rosslyn Farms, PA
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
6.4 days - Average rainfall days in March:
10.5 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
15.5 days - Average rainfall days in June:
13.7 days
- Average rainfall days in July:
15.6 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
10.6 days - Average rainfall days in October:
10 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (6.4 days).
Average snowfall
Rosslyn Farms, PA
The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Rosslyn Farms, PA
- Average snowfall days in January:
9.3 days - Average snowfall days in February:
7.8 days - Average snowfall days in March:
5 days - Average snowfall days in April:
1.3 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:
0.2 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
6.4 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rosslyn Farms, 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:
9h and 5min - 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 18min).
- Average sunshine in January:
3h and 0min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 2min - 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:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 3min - Average sunshine in October:
5h and 2min - Average sunshine in November:
4h and 5min - Average sunshine in December:
3h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days
Rosslyn Farms, PA
- Average sunshine days in January:
17.6 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
15 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
13.9 days
- Average sunshine days in July:
12.7 days - Average sunshine days in August:
14.1 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
18.1 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
18.5 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.2 days).
Average UV index
Rosslyn Farms, PA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Rosslyn Farms, PA
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility
Rosslyn Farms, 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).
Rosslyn Farms, Pennsylvania, USA
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