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
May comes with a subtle rise, with the average high-temperature adjusting from a comfortable 67.8°F (19.9°C) in April to a warm 76.6°F (24.8°C). Herndon experiences an average nighttime temperature of 58.8°F (14.9°C) in the month of May.Humidity
The months with the highest humidity in Herndon are March and May, with an average relative humidity of 79%.Rainfall
In May, in Herndon, the rain falls for 18.7 days. Throughout May, 3.98" (101mm) of precipitation is accumulated. In Herndon, during the entire year, the rain falls for 179.3 days and collects up to 39.76" (1010mm) of precipitation.Snowfall
In Herndon, Kentucky, snow does not fall in May through September.Daylight
In Herndon, the average length of the day in May is 14h and 8min.On the first day of May, sunrise is at 5:55 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:03 pm CDT.
Sunshine
In May, the average sunshine is 9.4h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 6 during May leads to these advisories:
Deter overexposure. Protecting against the sun's effects is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Herndon in May?
What are the most humid months in Herndon?
What is the average humidity in May in Herndon?
How much does it rain in Herndon in May?
When it does not snow in Herndon?
Does it snow in Herndon in May?
What is the average length of the day in May in Herndon?
When is the sunrise / sunset in May in Herndon?
How many hours of sunshine does Herndon have in May?
When is the highest UV index in Herndon?
What is the UV index intensity in May in Herndon?
Average temperature in May
Herndon, KY
- Average high temperature in May: 76.6°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 (42.6°F).
- Average low temperature in May: 58.8°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in May
Herndon, KY
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in May
Herndon, KY
- Average wind speed in May: 7mph
The windiest months (with the highest average wind speed) are February and April (8.8mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).
Average humidity in May
Herndon, KY
- Average humidity in May: 79%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Herndon, KY
- Average rainfall in May: 3.98"
The wettest month (with the highest rainfall) is February (4.06").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in May
Herndon, KY
- Average rainfall days in May: 18.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (10.8 days).
Average snowfall in May
Herndon, KY
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Herndon, KY
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (4.9 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
Herndon, KY
- Average daylight in May: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in May: 9h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in May
Herndon, KY
- Average sunshine days in May: 10.3 days
The months with the most sunshine days are October and November (17.8 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in May
Herndon, KY
- 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, February and December (UV index 2).
Average cloud cover in May
Herndon, KY
- Average cloud cover in May: 38
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in May
Herndon, KY
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Herndon, Kentucky, USA
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