Herndon, VA Climate


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United States / Virginia / Washington-Arlington-Alexandria Metro Area / Fairfax County / Herndon / Zip Codes
Herndon, VA has a humid subtropical climate with hot and humid summers and cool winters. The summer months typically feature temperatures in the mid-80s Fahrenheit (around 30 Celsius) with high humidity levels. Winters are generally mild, with temperatures rarely dropping below freezing and snowfall being uncommon. Rainfall is moderate year-round, usually around three inches per month throughout the year. Spring and fall months offer pleasant weather conditions with comfortable temperatures and low humidity levels.

Herndon, Virginia gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Herndon averages 22 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Herndon. The US average is 205 sunny days.

Herndon gets some kind of precipitation, on average, 120 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 86 degrees
Winter Low: the January low is 24
Rain: averages 43 inches of rain a year
Snow: averages 22 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Herndon is 7.3 (10=best), which means it is about average compared to other places in Virginia.

8.3 Summer - 5.6 Winter
September, June and May are the most pleasant months in Herndon, while January and February are the least comfortable months.

  ClimateHerndon, VirginiaUnited States
  42.9 in.38.1 in.
  21.5 in.27.8 in.
  119.5 days106.2 days
  201 days205 days
  85.8°85.8°
  23.5°21.7°
  7.37
  44.3
  361 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Herndon with an average high temperature of 85.8°, which ranks it as cooler than most places in Virginia. In Herndon, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Herndon are September, June and May.
In Herndon, there are 18.9 days annually when the high temperature is over 90°, which is cooler than most places in Virginia.
January has the coldest nighttime temperatures for Herndon with an average of 23.5°. This is colder than most places in Virginia.
In Herndon, there are 103.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Virginia.
In Herndon, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Virginia.
The humidity is usually acceptable in Herndon but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most uncomfortably humid months in Herndon.
May is the wettest month in Herndon with 4.6 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Summer with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.9 inches in Herndon means that it is drier than most places in Virginia.
May is the rainiest month in Herndon with 12.2 days of rain, and October is the driest month with only 8.1 rainy days. There are 119.5 rainy days annually in Herndon, which is rainier than most places in Virginia. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.
An annual snowfall of 21.5 inches in Herndon means that it is one of the snowiest places in Virginia. February is the snowiest month in Herndon with 7.8 inches of snow, and 5 months of the year have significant snowfall.
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Adam · Herndon, VA
Herndon, VA Weather
Over 9 years ago

Seasons tend to be relatively mild. The warmer seasons are extended by 3-4 weeks as compared to the New York Metropolitan Area.  More

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Erin · Herndon, VA
traffic
Over 15 years ago

Traffic has gotten out of control the last couple of  More

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Mark · Herndon, VA
About Herndon
Over 15 years ago

We actually live south of Herndon in Oak Hill (Zip Code 20171). The Town of Herndon is incorporated, Oak Hill is not. Herndon is a nice enough city with an historic area  More

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