Herndon, VA Weather - Forecast & Monthly Averages

TEMPERATURE	44
HUMIDITY	70
PRESSURE	100070
WIND COND.	300 22.3

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Weather Quick Facts

The highest monthly average temperature in Herndon for July is 77.7 degrees
The lowest monthly average temperature in Herndon for January is 34.4 degrees
The most monthly precipitation in Herndon occurs in May with 5.6 inches
The air quality index in Herndon is 12% worse than the national average
The pollution index in Herndon is 86% better than the national average

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Herndon Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	24°F	46°F	34°F	2.7"
February	25°F	48°F	36°F	2.1"
March	33°F	58°F	45°F	3.2"
April	43°F	71°F	56°F	3.7"
May	52°F	78°F	65°F	5.6"
June	61°F	86°F	74°F	4.5"
July	66°F	90°F	78°F	4.2"
August	65°F	88°F	76°F	2.8"
September	58°F	82°F	69°F	3.5"
October	46°F	71°F	58°F	5.4"
November	35°F	59°F	46°F	2.6"
December	29°F	50°F	39°F	3.8"

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Herndon air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Herndon	Virginia	National
Air quality index	47	58	42
Pollution index	380,124	1,561,881	2,726,193

Herndon air quality

Measurement	Total
Days measured	365
Days with good air quality	209
Days with moderate air quality	145
Days w/ poor A.Q. for sensitive groups	10
Days with unhealthy air quality	1

Air quality details

Pollutant	Total
Arsenic	0.003%
Benzene	0.005%
Carbon Tetrachloride	0.001%
Lead	0.001%
Mercury	0.000%

Average monthly Herndon temperature with heat index

Herndon monthly precipitation with daily maximum

Herndon monthly snow depth with daily maximum

Herndon monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Woodburn, VA	10,081	38	24.0%
Bull Run Mountain Estates, VA	1,777	38	24.0%
Hamilton, VA	708	38	24.0%
Arcola, VA	1,761	47	6.0%
McNair, VA	20,776	47	6.0%
Herndon, VA	24,577	47	6.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Pooler, GA	24,575	39	22.0%
Palm River-Clair Mel, FL	24,571	43	14.0%
Marysville, OH	24,569	46	8.0%
Foothills No. 31, AB	24,563	n/a
Norton Shores, MI	24,557	38	24.0%
Herndon, VA	24,577	47	6.0%

Source: The Herndon, VA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.