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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, is an icy winter month in Herndon, West Virginia, with an average temperature varying between 38.3°F (3.5°C) and 24.8°F (-4°C). The coldest month is January, with an average high-temperature of 38.3°F (3.5°C) and an average low-temperature of 24.8°F (-4°C). Weather in January »
Weather in February
February, the last month of the winter in Herndon, is another cold month, with an average temperature ranging between min 27.5°F (-2.5°C) and max 42.6°F (5.9°C). February's arrival brings an average high-temperature of a still wintry 42.6°F (5.9°C), demonstrating subtle variation from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Herndon, West Virginia, with an average temperature fluctuating between 51.1°F (10.6°C) and 34.5°F (1.4°C). Herndon's weather in March shows a minor rise in the average high-temperature, moving slightly up from February's cold 42.6°F (5.9°C) to a cool 51.1°F (10.6°C). Weather in March »
Weather in April
April in Herndon, West Virginia, is a refreshing spring month, with temperature in the range of an average low of 43.5°F (6.4°C) and an average high of 62.8°F (17.1°C). With the onset of April, the average high-temperature slightly shifts from March's fresh 51.1°F (10.6°C) to an enjoyable 62.8°F (17.1°C). Weather in April »
Weather in May
May, the last month of the spring in Herndon, is a pleasant month, with an average temperature fluctuating between 51.6°F (10.9°C) and 72.1°F (22.3°C). The arrival of May brings a temperature shift, with the average high-temperature escalating from an enjoyable 62.8°F (17.1°C) in April to an agreeable 72.1°F (22.3°C). Weather in May »
Weather in June
June, the first month of the summer in Herndon, is a warm month, with an average temperature varying between 79.3°F (26.3°C) and 56.7°F (13.7°C). The arrival of June brings a soft temperature shift, with the average high-temperature nudging from an agreeable 72.1°F (22.3°C) in May to a moderately hot 79.3°F (26.3°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Herndon, West Virginia, with an average temperature fluctuating between 60.1°F (15.6°C) and 82.8°F (28.2°C). 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). July's average heat index is calculated to be a tropical 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Herndon, is another warm month, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 58.5°F (14.7°C). The transition from July to August brings an average high-temperature of a still moderately hot 82°F (27.8°C), barely different from July's 82.8°F (28.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Herndon, West Virginia, with an average temperature ranging between min 54.1°F (12.3°C) and max 75.9°F (24.4°C). In Herndon, the average high-temperature in September gently drops from 82°F (27.8°C) in August to a still moderately hot 75.9°F (24.4°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Herndon, West Virginia, with an average temperature fluctuating between 45°F (7.2°C) and 63.7°F (17.6°C). October suggests a modest reduction in the average high-temperature, shifting from a warm 75.9°F (24.4°C) in September to a refreshing 63.7°F (17.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Herndon, West Virginia, with an average temperature ranging between min 34.7°F (1.5°C) and max 52°F (11.1°C). Herndon's November weather comes with a decrease in average high-temperatures, moving from a refreshing 63.7°F (17.6°C) in October to a cool 52°F (11.1°C). Weather in November »
Weather in December
December, the first month of the winter in Herndon, is also a frosty month, with temperature in the range of an average high of 43.5°F (6.4°C) and an average low of 30.7°F (-0.7°C). Herndon, West Virginia, experiences a moderate temperature shift at the start of December, with average high-temperatures adjusting a bit from a fresh 52°F (11.1°C) in November to a chilly 43.5°F (6.4°C). Weather in December »
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in Herndon?
January, recording an average high temperature of 38.3°F (3.5°C) and a low temperature of 24.8°F (-4°C), is Herndon's coldest month.
How much does it rain?
Throughout the year, there are 180.7 rainfall days, and 32.24" (819mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
How many days does it snow?
Throughout the year, there are 50.3 snowfall days, and 27.09" (688mm) of snow is accumulated.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.2h of sunshine.
When is the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month?
With an average relative humidity of 83%, February is the most humid month.
What is the wettest month in Herndon?
The months with the most rainfall are February and May, with an average 3.43" (87mm) of precipitation.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 11.7 days and accumulates 6.02" (153mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Herndon, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month?
June through August and November, with an average relative humidity of 77%, are the least humid months.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 14h and 42min of daylight.
What is the month with the highest UV index?
The months with the highest UV index in Herndon are June and August, with an average maximum UV index of 6.
What month is the hottest?
Herndon's warmest month, July, generally records average temperatures ranging from a high of 82.8°F (28.2°C) to a low of 60.1°F (15.6°C).
What month has the most sunshine?
August has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the driest month?
The month with the least rainfall in Herndon is September, when the rain falls for 15.5 days and typically collects 1.57" (40mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 36min of daylight, December has the shortest days of the year.
Average temperature
Herndon, WV
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).
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
Herndon, WV
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
30.02"Hg - Average pressure in August:
30.03"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.07"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.14"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
Herndon, WV
- Average wind speed in January:
7.4mph - Average wind speed in February:
7.3mph - Average wind speed in March:
6.8mph - Average wind speed in April:
7.1mph - Average wind speed in May:
5.9mph - Average wind speed in June:
5.2mph
- Average wind speed in July:
4.6mph - Average wind speed in August:
4.2mph - Average wind speed in September:
4.5mph - Average wind speed in October:
5.5mph - Average wind speed in November:
5.8mph - Average wind speed in December:
6.6mph
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
Herndon, WV
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
Herndon, WV
- Average rainfall in January:
2.68" - Average rainfall in February:
3.43" - Average rainfall in March:
2.95" - Average rainfall in April:
2.99" - Average rainfall in May:
3.43" - Average rainfall in June:
2.56"
- Average rainfall in July:
2.64" - Average rainfall in August:
2.13" - Average rainfall in September:
1.57" - Average rainfall in October:
2.68" - Average rainfall in November:
2.05" - Average rainfall in December:
3.15"
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
Herndon, WV
- Average rainfall days in January:
12.2 days - Average rainfall days in February:
11.8 days - Average rainfall days in March:
15.9 days - Average rainfall days in April:
17.3 days - Average rainfall days in May:
20.1 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
18.3 days - Average rainfall days in August:
15.6 days - Average rainfall days in September:
15.5 days - Average rainfall days in October:
13 days - Average rainfall days in November:
11.3 days - Average rainfall days in December:
12.4 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
Herndon, WV
- Average snowfall in January:
5.94" - Average snowfall in February:
6.02" - Average snowfall in March:
5.47" - Average snowfall in April:
1.3" - Average snowfall in May:
0.43" - Average snowfall in June:
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
Herndon, WV
- Average snowfall days in January:
13.1 days - Average snowfall days in February:
11.7 days - Average snowfall days in March:
7.2 days - Average snowfall days in April:
1.9 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
1.2 days - Average snowfall days in November:
4.4 days - Average snowfall days in December:
10.5 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 / Average sunshine
Herndon, WV
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
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 January:
4h and 1min - Average sunshine in February:
5h and 0min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 4min
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
Herndon, WV
- Average sunshine days in January:
9.7 days - Average sunshine days in February:
8.3 days - Average sunshine days in March:
10.2 days - Average sunshine days in April:
9.9 days - Average sunshine days in May:
9.6 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
10.2 days - Average sunshine days in August:
12.8 days - Average sunshine days in September:
12.1 days - Average sunshine days in October:
15.7 days - Average sunshine days in November:
15.8 days - Average sunshine days in December:
11.7 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
Herndon, WV
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
Herndon, WV
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
Herndon, WV
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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