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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 another cold winter month in Chantilly, Virginia, with temperature in the range of an average low of 25.7°F (-3.5°C) and an average high of 39.7°F (4.3°C). The coldest time of the year is January, with temperatures averaging a high of 39.7°F (4.3°C) and a low of 25.7°F (-3.5°C). Weather in January »
Weather in February
February, the last month of the winter in Chantilly, is a frosty month, with temperature in the range of an average high of 44.4°F (6.9°C) and an average low of 28.2°F (-2.1°C). February records an average high-temperature of a frosty 44.4°F (6.9°C), indicating a minor variation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Chantilly, is a fresh month, with an average temperature fluctuating between 52.5°F (11.4°C) and 36°F (2.2°C). Chantilly perceives a slight temperature ascent during March, with average high-temperatures adjusting from a frosty 44.4°F (6.9°C) in February to a cool 52.5°F (11.4°C). Weather in March »
Weather in April
April in Chantilly, Virginia, is a comfortable spring month, with an average temperature varying between 45.7°F (7.6°C) and 64.9°F (18.3°C). Chantilly sees a rise in temperature during April, with average high-temperatures transitioning from a fresh 52.5°F (11.4°C) in March to a refreshing 64.9°F (18.3°C). Weather in April »
Weather in May
May, the last month of the spring in Chantilly, is a warm month, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 75°F (23.9°C). May brings a temperature increase, with average high-temperatures moving from April's enjoyable 64.9°F (18.3°C) to a warm 75°F (23.9°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Chantilly, Virginia, with an average temperature ranging between max 82.9°F (28.3°C) and min 62.6°F (17°C). Observing a minor shift, the average high-temperature during June adjusts from May's 75°F (23.9°C) to a still moderately hot 82.9°F (28.3°C). Weather in June »
Weather in July
July is a tropical summer month in Chantilly, Virginia, with an average temperature varying between 67.3°F (19.6°C) and 88.2°F (31.2°C). The warmest temperatures occur during July, when averages reach a peak of 88.2°F (31.2°C) and a low of 67.3°F (19.6°C). The heat index value during July is appraised at a fiery hot 100.4°F (38°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Chantilly, Virginia, with temperature in the range of an average high of 85.6°F (29.8°C) and an average low of 65.8°F (18.8°C). Chantilly's shift from July to August is accompanied by an average high-temperature of a warm 85.6°F (29.8°C), a slight deviation from 88.2°F (31.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Chantilly, Virginia, with an average temperature varying between 78.4°F (25.8°C) and 59.9°F (15.5°C). September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 85.6°F (29.8°C) in August to a still warm 78.4°F (25.8°C). Weather in September »
Weather in October
October, like September, in Chantilly, Virginia, is another comfortable autumn month, with temperature in the range of an average high of 66.6°F (19.2°C) and an average low of 49.1°F (9.5°C). The start of October signals a decrease in the average high-temperature, transitioning from a moderately hot 78.4°F (25.8°C) in September to a comfortable 66.6°F (19.2°C). Weather in October »
Weather in November
November, the last month of the autumn in Chantilly, is also a fresh month, with temperature in the range of an average high of 53.6°F (12°C) and an average low of 37.6°F (3.1°C). The average high-temperature drops in November, from October's refreshing 66.6°F (19.2°C) to a fresh 53.6°F (12°C). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in Chantilly, Virginia, with temperature in the range of an average low of 32.2°F (0.1°C) and an average high of 45.3°F (7.4°C). The beginning of December brings a slight decrease in the average high-temperature, transitioning from a fresh 53.6°F (12°C) in November to a frosty 45.3°F (7.4°C). Weather in December »
Updated: Jul 15, 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 is the coldest time of year?
In Chantilly, January is known for its average lowest temperatures, reaching a high of 39.7°F (4.3°C) and a low of 25.7°F (-3.5°C).
How many days does it rain?
Throughout the year, there are 156 rainfall days, and 31.18" (792mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, November and December.
When does it snow the most?
The month with the most snowfall is January, when snow falls for 5.2 days and typically aggregates up to 3.58" (91mm) of snow.
How many days does it snow?
In Chantilly, during the entire year, snow falls for 16.8 days and aggregates up to 12.48" (317mm) of snow.
What is the month with the least sunshine?
January, February and December, with an average of 5.1h of sunshine, are months with the least sunshine.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
When it does not snow?
In Chantilly, snow does not fall in May through October.
When is the highest UV index?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days?
With an average of 14h and 54min of daylight, June has the longest days of the year.
What are the warmest months?
With average high temperatures of 88.2°F (31.2°C) and lows of 67.3°F (19.6°C), July is the warmest month.
What is the least humid month?
July is the least humid month in Chantilly, Virginia, with an average relative humidity of 71%.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.7h of sunshine.
What is the rainiest month?
August is the month with the most rainfall in Chantilly. Rain falls for 16.1 days and accumulates 3.74" (95mm) of precipitation.
What is the driest month?
September is the month with the least rainfall. Rain falls for 12 days and accumulates 1.89" (48mm) of precipitation.
What are the most humid months?
October and December, with an average relative humidity of 77%, are most humid months.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Chantilly, VA
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (39.7°F).
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure
Chantilly, VA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed
Chantilly, VA
- Average wind speed in January:
7.1mph - Average wind speed in February:
7.1mph - Average wind speed in March:
7.3mph - Average wind speed in April:
7.3mph - Average wind speed in May:
6mph - Average wind speed in June:
5.5mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5.2mph - Average wind speed in October:
6.2mph - Average wind speed in November:
6.5mph - Average wind speed in December:
6.5mph
The windiest months (with the highest average wind speed) are March and April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity
Chantilly, VA
The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).
Average rainfall
Chantilly, VA
- Average rainfall in January:
2.09" - Average rainfall in February:
2.17" - Average rainfall in March:
2.48" - Average rainfall in April:
2.8" - Average rainfall in May:
3.15" - Average rainfall in June:
2.44"
- Average rainfall in July:
2.91" - Average rainfall in August:
3.74" - Average rainfall in September:
1.89" - Average rainfall in October:
2.52" - Average rainfall in November:
2.32" - Average rainfall in December:
2.68"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days
Chantilly, VA
- Average rainfall days in January:
9.5 days - Average rainfall days in February:
10.2 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
16.1 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
12 days - Average rainfall days in October:
12 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.3 days).
Average snowfall
Chantilly, VA
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Chantilly, VA
- Average snowfall days in January:
5.2 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
2.9 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 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:
0 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
2.7 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Chantilly, VA
- 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 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - 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 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
5h and 1min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 5min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days
Chantilly, VA
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14.2 days - Average sunshine days in March:
15 days - Average sunshine days in April:
13.2 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
14.1 days
- Average sunshine days in July:
12.1 days - Average sunshine days in August:
12.7 days - Average sunshine days in September:
17.2 days - Average sunshine days in October:
17.3 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
17.8 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (12.1 days).
Average UV index
Chantilly, VA
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Chantilly, VA
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility
Chantilly, VA
The months with the highest visibility are February, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and May (5mi).
Chantilly, Virginia, USA
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