Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average snowfall in July
- Average snowfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
Herndon's temperature records reveal July as the warmest month, marked by average highs of 82.8°F (28.2°C) and lows of 60.1°F (15.6°C).Heat index
July's average heat index is calculated to be a tropical 89.6°F (32°C). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', arises from combining readings of air temperature and relative moisture content. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are particularly relevant to children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
The months with the lowest humidity are June through August and November, with an average relative humidity of 77%.Rainfall
In Herndon, in July, it is raining for 18.3 days, with typically 2.64" (67mm) of accumulated precipitation. In Herndon, during the entire year, the rain falls for 180.7 days and collects up to 32.24" (819mm) of precipitation.Snowfall
In Herndon, snow does not fall in June through September.Daylight
In Herndon, the average length of the day in July is 14h and 27min.On the first day of July, sunrise is at 6:08 am and sunset at 8:50 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 8:34 pm EDT.
Sunshine
In July, the average sunshine is 9.9h.UV index
The average daily maximum UV index in July is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 5 during July translates into the following guidance:
Put precautions into practice - Guidance to elude sunburn is provided. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the hottest?
How hot is it in July?
What is the least humid month?
What is the average humidity in July?
How many days does it rain in July?
When it does not snow?
What is the average length of the day in July?
What time are sunrise and sunset in July?
How many hours of sunshine does Herndon have in July?
How high is the UV index in July?
Average temperature in July
Herndon, WV
- Average high temperature in July: 82.8°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in July: 60.1°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in July
Herndon, WV
- Average pressure in July: 30.02"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in July
Herndon, WV
- Average wind speed in July: 4.6mph
The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in July
Herndon, WV
- Average humidity in July: 77%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July, August and November (77%).
Average rainfall in July
Herndon, WV
- Average rainfall in July: 2.64"
The wettest months (with the highest rainfall) are February and May (3.43").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in July
Herndon, WV
- Average rainfall days in July: 18.3 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is November (11.3 days).
Average snowfall in July
Herndon, WV
- Average snowfall in July: 0"
The month with the highest snowfall is February (6.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in July
Herndon, WV
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in July /
Average sunshine in July
Herndon, WV
- Average daylight in July: 14h and 3min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in July: 9h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in July
Herndon, WV
- Average sunshine days in July: 10.2 days
The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is February (8.3 days).
Average UV index in July
Herndon, WV
- Average UV index in July: 5
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in July
Herndon, WV
- Average cloud cover in July: 37
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in July
Herndon, WV
- Average visibility in July: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Herndon, West Virginia, USA
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