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's April weather brings a rise in high-temperatures, moving from a chilly 46°F (7.8°C) in March to a moderate 58.5°F (14.7°C). Throughout April nights, Herndon registers an average low-temperature of 42.1°F (5.6°C).Humidity
In April, the average relative humidity is 70%.Rainfall
In Herndon, Iowa, during April, the rain falls for 14.7 days and regularly aggregates up to 2.76" (70mm) of precipitation. Throughout the year, in Herndon, there are 125.7 rainfall days, and 26.5" (673mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In April, it is snowing for 1.7 days. Throughout April, 1.26" (32mm) of snow is accumulated. In Herndon, during the entire year, snow falls for 38.1 days and aggregates up to 15.31" (389mm) of snow.Daylight
The average length of the day in April in Herndon is 13h and 23min.On the first day of April, sunrise is at 6:58 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:15 pm CDT.
Sunshine
In April, the average sunshine is 7.8h.UV index
In Herndon, the average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 3 during April translates into the following guidance:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Stay sun-safe with clothing that is both closely woven and worn loosely. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Frequently asked questions
What is the temperature in April in Herndon?
What is the average humidity in April in Herndon?
How many days does it rain in April in Herndon?
How many days does it snow in April in Herndon?
How many hours of daylight does Herndon have in April?
When is the sunrise / sunset in April in Herndon?
How long on average sun shines in April in Herndon?
How high is the UV index in April in Herndon?
Average temperature in April
Herndon, IA
- Average high temperature in April: 58.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in April: 42.1°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in April
Herndon, IA
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in April
Herndon, IA
- Average wind speed in April: 10.7mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in April
Herndon, IA
- Average humidity in April: 70%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in April
Herndon, IA
- Average rainfall in April: 2.76"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in April
Herndon, IA
- Average rainfall days in April: 14.7 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).
Average snowfall in April
Herndon, IA
- Average snowfall in April: 1.26"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Herndon, IA
- Average snowfall days in April: 1.7 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Herndon, IA
- Average daylight in April: 13h and 2min
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 April: 7h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in April
Herndon, IA
- Average sunshine days in April: 12.9 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in April
Herndon, IA
- Average UV index in April: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in April
Herndon, IA
- Average cloud cover in April: 46
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in April
Herndon, IA
- Average visibility in April: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Herndon, Iowa, USA
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