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
A shift in the average high-temperature is noticeable in May, changing from an enjoyable 63.5°F (17.5°C) in April to a pleasant 72.9°F (22.7°C). Grottoes records a steady low-temperature average of 51.8°F (11°C) during May.Humidity
The months with the highest humidity are May, September and October, with an average relative humidity of 78%.Rainfall
May is the month with the most rainfall. Rain falls for 18.8 days and accumulates 3.27" (83mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Grottoes. During 0.1 snowfall days, in May, Grottoes aggregates 0.08" (2mm) of snow. In Grottoes, Virginia, during the entire year, snow falls for 21.7 days and aggregates up to 16.69" (424mm) of snow.Daylight
The average length of the day in May is 14h and 16min.On the first day of May, sunrise is at 6:17 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 5:53 am and sunset at 8:32 pm EDT.
Sunshine
In May, the average sunshine is 9.2h.UV index
May through July, with an average maximum UV index of 6, are months with the highest UV index in Grottoes. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 6 during May translates into the following guidance:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the most humid month?
What is the average humidity in May?
What is the rainiest month?
How much does it rain in May?
What is the last month it snows?
How many hours of daylight does Grottoes have in May?
When is the sunrise / sunset in May?
How long on average sun shines in May?
When is the highest UV index in Grottoes?
What is the UV index intensity in May?
Average temperature in May
Grottoes, VA
- Average high temperature in May: 72.9°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in May: 51.8°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 (24.3°F).
Average pressure in May
Grottoes, VA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in May
Grottoes, VA
- Average wind speed in May: 5.5mph
The windiest months (with the highest average wind speed) are February and April (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in May
Grottoes, VA
- Average humidity in May: 78%
The months with the highest relative humidity are May, September and October (78%).
The months with the lowest relative humidity are January, June and July (74%).
Average rainfall in May
Grottoes, VA
- Average rainfall in May: 3.27"
The wettest month (with the highest rainfall) is May (3.27").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in May
Grottoes, VA
- Average rainfall days in May: 18.8 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in May
Grottoes, VA
- Average snowfall in May: 0.08"
The month with the highest snowfall is March (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Grottoes, VA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Grottoes, VA
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in May: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in May
Grottoes, VA
- Average sunshine days in May: 10.8 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in May
Grottoes, VA
- Average UV index in May: 6
The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Grottoes, VA
- Average cloud cover in May: 42
The month with the most cloud cover is March (Cloud cover 46).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in May
Grottoes, VA
- 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).
Grottoes, Virginia, USA
Weather forecast for your location
2. Allow the app to use your location