Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
Herndon in April sees a temperature change, with average high-temperatures moving from a mild 57.4°F (14.1°C) in March to an enjoyable 67.8°F (19.9°C). In the month of April, Herndon experiences an average low-temperature of 49.6°F (9.8°C).Humidity
The average relative humidity in April in Herndon is 76%.Rainfall
In Herndon, Kentucky, during April, the rain falls for 15.9 days and regularly aggregates up to 3.74" (95mm) of precipitation. Throughout the year, in Herndon, there are 179.3 rainfall days, and 39.76" (1010mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. April is the last month it regularly snows in Herndon. During 0.3 snowfall days, in April, Herndon aggregates 0.12" (3mm) of snow. Throughout the year, there are 15.8 snowfall days, and 5.35" (136mm) of snow is accumulated.Daylight
The average length of the day in April in Herndon is 13h and 10min.On the first day of April in Herndon, sunrise is at 6:34 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 7:38 pm CDT.
Sunshine
The average sunshine in April is 8.7h.UV index
In Herndon, the average daily maximum UV index in April is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: During April, 5 as the daily maximum UV index converts into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
What are April temperatures in Herndon?
What is the average humidity in April in Herndon?
How much does it rain in Herndon in April?
What is the last month it snows in Herndon?
What is the average length of the day in April in Herndon?
What time are sunrise and sunset in April in Herndon?
How long on average sun shines in April in Herndon?
What is the UV index reading in April in Herndon?
Average temperature in April
Herndon, KY
- Average high temperature in April: 67.8°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 (42.6°F).
- Average low temperature in April: 49.6°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 April
Herndon, KY
- Average pressure in April: 29.98"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 April
Herndon, KY
- Average wind speed in April: 8.8mph
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 April
Herndon, KY
- Average humidity in April: 76%
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 April
Herndon, KY
- Average rainfall in April: 3.74"
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 April
Herndon, KY
- Average rainfall days in April: 15.9 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 April
Herndon, KY
- Average snowfall in April: 0.12"
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 April
Herndon, KY
- Average snowfall days in April: 0.3 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 April /
Average sunshine in April
Herndon, KY
- Average daylight in April: 13h 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 April: 8h and 4min
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 April
Herndon, KY
- Average sunshine days in April: 12.2 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 April
Herndon, KY
- Average UV index in April: 5
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 April
Herndon, KY
- Average cloud cover in April: 40
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 April
Herndon, KY
- Average visibility in April: 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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