Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The arrival of May brings a change in Grand Valley's weather, with average high-temperatures moving from April's cool 54.9°F (12.7°C) to a refreshing 67.1°F (19.5°C). In Grand Valley, May's nights observe an average temperature dip to a frosty 47.3°F (8.5°C).Humidity
May is the least humid month, with an average relative humidity of 79%.Rainfall
In Grand Valley, in May, during 17.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Grand Valley, during the entire year, the rain falls for 160.2 days and collects up to 23.43" (595mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.8 snowfall days, in May, Grand Valley aggregates 0.31" (8mm) of snow. Throughout the year, there are 85.6 snowfall days, and 26.54" (674mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 34min.On the first day of May, sunrise is at 6:13 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 8:45 pm EDT.
Sunshine
In May, the average sunshine is 8.4h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The UV index of 5 during May translates into the following guidance:
Undertake protective steps - Preventing sun damage is advised. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature?
What is the least humid month?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
How many hours of daylight does Grand Valley have in May?
When are sunrise and sunset in May?
How many hours of sunshine does Grand Valley have in May?
What are the months with the highest UV index in Grand Valley?
What is the UV index intensity in May?
Average temperature in May
Grand Valley, PA
- Average high temperature in May: 67.1°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in May: 47.3°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in May
Grand Valley, PA
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Grand Valley, PA
- Average wind speed in May: 6.8mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).
Average humidity in May
Grand Valley, PA
- Average humidity in May: 79%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (79%).
Average rainfall in May
Grand Valley, PA
- Average rainfall in May: 2.24"
The wettest month (with the highest rainfall) is April (2.32").
The driest month (with the least rainfall) is November (1.57").
Average rainfall days in May
Grand Valley, PA
- Average rainfall days in May: 17.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in May
Grand Valley, PA
- Average snowfall in May: 0.31"
The month with the highest snowfall is January (7.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Grand Valley, PA
- Average snowfall days in May: 0.8 days
The month with the highest number of snowfall days is January (21.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Grand Valley, PA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 12min).
Average sunshine days in May
Grand Valley, PA
- Average sunshine days in May: 10.4 days
The month with the most sunshine days is October (13.3 days).
The month with the least sunshine days is January (5.3 days).
Average UV index in May
Grand Valley, PA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in May
Grand Valley, PA
- Average cloud cover in May: 47
The month with the most cloud cover is January (Cloud cover 78).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in May
Grand Valley, PA
- Average visibility in May: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February and December (4mi).
Grand Valley, Pennsylvania, USA
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