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 McLean's weather, with average high-temperatures moving from April's refreshing 64.9°F (18.3°C) to a moderately hot 74.8°F (23.8°C). May brings with it a nighttime average temperature of 55.9°F (13.3°C).Humidity
In May, the average relative humidity in McLean is 75%.Rainfall
In McLean, in May, it is raining for 10.8 days, with typically 0.75" (19mm) of accumulated precipitation. In McLean, during the entire year, the rain falls for 109 days and collects up to 9.29" (236mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in May is 14h and 19min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:01 pm. On the last day of May, in McLean, sunrise is at 5:45 am and sunset at 8:27 pm EDT.
Sunshine
In May, the average sunshine in McLean is 9h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In May, the average maximum UV index of 6 translates into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Frequently asked questions
What is the usual temperature for McLean in May?
What is the average humidity in May in McLean?
How many days does it rain in May in McLean?
When it does not snow in McLean?
Does it snow in McLean in May?
How many hours of daylight does McLean have in May?
What time are sunrise and sunset in May in McLean?
How many hours of sunshine does McLean have in May?
What is the month with the highest UV index in McLean?
What is the UV index reading in May in McLean?
Average temperature in May
McLean, VA
- Average high temperature in May: 74.8°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in May: 55.9°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in May
McLean, VA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in May
McLean, VA
- Average wind speed in May: 6.3mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in May
McLean, VA
- Average humidity in May: 75%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in May
McLean, VA
- Average rainfall in May: 0.75"
The wettest month (with the highest rainfall) is August (1.5").
The driest months (with the least rainfall) are January and September (0.51").
Average rainfall days in May
McLean, VA
- Average rainfall days in May: 10.8 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in May
McLean, VA
- Average snowfall in May: 0"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
McLean, VA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
McLean, VA
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in May
McLean, VA
- Average sunshine days in May: 16.6 days
The month with the most sunshine days is November (23 days).
The month with the least sunshine days is July (14.3 days).
Average UV index in May
McLean, VA
- Average UV index in May: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in May
McLean, VA
- Average cloud cover in May: 43
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in May
McLean, VA
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
McLean, Virginia, USA
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