May weather forecast
Rosslyn Farms, PA

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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).

Temperature

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). During May, the average low-temperature is recorded at a fresh 51.3°F (10.7°C).

Humidity

The average relative humidity in May is 77%.

Rainfall

In Rosslyn Farms, during May, the rain falls for 15.5 days and regularly aggregates up to 1.22" (31mm) of precipitation. Throughout the year, there are 132.6 rainfall days, and 11.5" (292mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in May is 14h and 26min.
On the first day of the month, sunrise is at 6:18 am and sunset at 8:16 pm. On the last day of May, sunrise is at 5:52 am and sunset at 8:44 pm EDT.

Sunshine

In Rosslyn Farms, the average sunshine in May is 8.9h.

UV index

In Rosslyn Farms, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In May, a regular UV index of 5 translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

An average high-temperature, in May, in Rosslyn Farms, is 72.3°F (22.4°C) and the average low-temperature is 51.3°F (10.7°C).

What is the average humidity in May?

The average relative humidity in May is 77%.

How many days does it rain in May?

In Rosslyn Farms, in May, it is raining for 15.5 days, with typically 1.22" (31mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

Does it snow in May?

In May, it doesn't snow. April is the latest month when it typically snows.

How many hours of daylight does Rosslyn Farms have in May?

In May, the average day length is 14h and 26min.

What time are sunrise and sunset in May in Rosslyn Farms?

In May, on the first day of the month, sunrise is at 6:18 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:44 pm EDT.

How long on average sun shines in May?

The average sunshine duration in May is 8.9h.

How high is the UV index in May?

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Rosslyn Farms, PA

Average temperature in May - Rosslyn Farms, PA
  • Average high temperature in May: 72.3°F

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).

  • Average low temperature in May: 51.3°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 in May
Rosslyn Farms, PA

Average pressure in May - Rosslyn Farms, PA
  • Average pressure in May: 30"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 in May
Rosslyn Farms, PA

Average wind speed in May - Rosslyn Farms, PA
  • Average wind speed in May: 6mph

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 in May
Rosslyn Farms, PA

Average humidity in May - Rosslyn Farms, PA
  • Average humidity in May: 77%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).

Average rainfall in May
Rosslyn Farms, PA

Average rainfall in May - Rosslyn Farms, PA
  • Average rainfall in May: 1.22"

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 in May
Rosslyn Farms, PA

Average rainfall days in May - Rosslyn Farms, PA
  • Average rainfall days in May: 15.5 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 in May
Rosslyn Farms, PA

Average snowfall in May - Rosslyn Farms, PA
  • Average snowfall in May: 0"

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 in May
Rosslyn Farms, PA

Average snowfall days in May - Rosslyn Farms, PA
  • Average snowfall days in May: 0 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 in May /
Average sunshine in May
Rosslyn Farms, PA

Average daylight in May / Average sunshine in May - Rosslyn Farms, PA
  • Average daylight in May: 14h 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 May: 8h and 5min

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 in May
Rosslyn Farms, PA

Average sunshine days in May - Rosslyn Farms, PA
  • Average sunshine days in May: 12.2 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 in May
Rosslyn Farms, PA

Average UV index in May - Rosslyn Farms, PA
  • Average UV index in May: 5

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 in May
Rosslyn Farms, PA

Average cloud cover in May - Rosslyn Farms, PA
  • Average cloud cover in May: 44

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 in May
Rosslyn Farms, PA

Average visibility in May - Rosslyn Farms, PA
  • Average visibility in May: 5mi

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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