Chantilly weather in April
In April, Chantilly sees average daytime highs of 66°F and overnight lows near 46°F, with 3.4 in of precipitation across 10.3 wet days and about 13 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.
Highs climb over the month, from about 61°F in the first days to 69°F by the end. The sky is clear or mostly clear about 27% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 24 min at the start of April to 13 h 36 min by month's end. Set against the rest of the year, April is Chantilly's 9th-clearest and 4th-windiest month. For the whole year in context, see Chantilly's year-round climate.
- Daytime high
- 66°
- 7th warmest
- Overnight low
- 46°
- 6th coldest
- Precipitation
- 3.4 in
- 10.3 wet days
- Daylight
- 13 hours
- 5:40 AM – 6:40 PM
- Cloud cover
- 61%
- 9th clearest
- Wind
- 7 mph
- 4th windiest
- Solar energy
- 5.2 kWh/m²
- Travel score
- 5.8
- out of 10
Chantilly is unincorporated community located in Northern Virginia, United States.
- Density
- 733/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 61°F in the first days to 69°F by the end.
A typical April day in Chantilly reaches about 66°F in the afternoon and slips back to 46°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 53°F and 79°F. Set against its neighbours, April runs about 12°F warmer than March and about 9°F cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 60 | 61 | 61 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 65 | 66 | 66 | 66 | 67 | 67 | 67 | 67 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 70 | 70 |
| Avg low (°F) | 41 | 42 | 42 | 42 | 43 | 43 | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 51 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 60 | 41 |
| 2 | 61 | 42 |
| 3 | 61 | 42 |
| 4 | 62 | 42 |
| 5 | 62 | 43 |
| 6 | 63 | 43 |
| 7 | 63 | 44 |
| 8 | 63 | 44 |
| 9 | 64 | 44 |
| 10 | 64 | 45 |
| 11 | 64 | 45 |
| 12 | 65 | 45 |
| 13 | 65 | 46 |
| 14 | 65 | 46 |
| 15 | 66 | 46 |
| 16 | 66 | 47 |
| 17 | 66 | 47 |
| 18 | 67 | 47 |
| 19 | 67 | 47 |
| 20 | 67 | 48 |
| 21 | 67 | 48 |
| 22 | 68 | 48 |
| 23 | 68 | 49 |
| 24 | 68 | 49 |
| 25 | 69 | 49 |
| 26 | 69 | 49 |
| 27 | 69 | 50 |
| 28 | 69 | 50 |
| 29 | 70 | 50 |
| 30 | 70 | 51 |
How April really feels in Chantilly
Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Chantilly weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 42° / 28° | 3.0 | 8.6 | 3 | 9.6 | 0.3 |
| Feb | 45° / 29° | 2.8 | 8.1 | 3 | 10.5 | 1.1 |
| Mar | 54° / 36° | 3.8 | 10 | 2 | 11.7 | 3.3 |
| Apr | 66° / 46° | 3.4 | 10.3 | 0.1 | 13 | 5.8 |
| May | 74° / 56° | 3.8 | 11.3 | 0 | 14.1 | 6.5 |
| Jun | 83° / 65° | 3.4 | 11.2 | 0 | 14.7 | 5.5 |
| Jul | 88° / 69° | 3.9 | 11.8 | 0 | 14.4 | 4.4 |
| Aug | 85° / 68° | 3.3 | 10.4 | 0 | 13.5 | 5.1 |
| Sep | 78° / 60° | 4.4 | 9.5 | 0 | 12.3 | 6.7 |
| Oct | 67° / 49° | 3.4 | 7.8 | 0 | 11 | 6.5 |
| Nov | 55° / 38° | 3.0 | 7.6 | 0.3 | 9.9 | 3.9 |
| Dec | 46° / 32° | 3.5 | 9.1 | 2.1 | 9.3 | 1.3 |
Cloud cover in April
The sky is clear or mostly clear about 27% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 15% of April, with mostly cloudy or overcast conditions the remaining 57%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 42 | 43 | 44 | 44 | 44 | 45 | 46 | 46 | 46 | 46 | 45 | 44 | 44 | 43 | 43 | 42 | 42 | 42 | 42 | 41 | 41 | 40 | 40 | 41 | 41 | 41 | 41 | 41 | 42 | 42 |
| Cloudier (%) | 58 | 57 | 56 | 56 | 56 | 55 | 54 | 54 | 54 | 54 | 55 | 56 | 56 | 57 | 57 | 58 | 58 | 58 | 58 | 59 | 59 | 60 | 60 | 59 | 59 | 59 | 59 | 59 | 58 | 58 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 42 | 58 |
| 2 | 43 | 57 |
| 3 | 44 | 56 |
| 4 | 44 | 56 |
| 5 | 44 | 56 |
| 6 | 45 | 55 |
| 7 | 46 | 54 |
| 8 | 46 | 54 |
| 9 | 46 | 54 |
| 10 | 46 | 54 |
| 11 | 45 | 55 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 43 | 57 |
| 15 | 43 | 57 |
| 16 | 42 | 58 |
| 17 | 42 | 58 |
| 18 | 42 | 58 |
| 19 | 42 | 58 |
| 20 | 41 | 59 |
| 21 | 41 | 59 |
| 22 | 40 | 60 |
| 23 | 40 | 60 |
| 24 | 41 | 59 |
| 25 | 41 | 59 |
| 26 | 41 | 59 |
| 27 | 41 | 59 |
| 28 | 41 | 59 |
| 29 | 42 | 58 |
| 30 | 42 | 58 |
Chance of precipitation in April
Chantilly gets around 3.4 in of rain and snow over 10.3 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 35% and peaks near 39% on the wettest days, and about 0 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 34 | 34 | 35 | 35 | 36 | 36 | 36 | 37 | 37 | 37 | 38 | 38 | 38 | 39 | 39 | 39 |
| Snow chance (%) | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 33 | 2 |
| 2 | 33 | 2 |
| 3 | 33 | 2 |
| 4 | 33 | 1 |
| 5 | 33 | 1 |
| 6 | 33 | 1 |
| 7 | 33 | 1 |
| 8 | 32 | 1 |
| 9 | 32 | 1 |
| 10 | 32 | 1 |
| 11 | 32 | 1 |
| 12 | 32 | 1 |
| 13 | 33 | 1 |
| 14 | 33 | 0 |
| 15 | 34 | 0 |
| 16 | 34 | 0 |
| 17 | 35 | 0 |
| 18 | 35 | 0 |
| 19 | 36 | 0 |
| 20 | 36 | 0 |
| 21 | 36 | 0 |
| 22 | 37 | 0 |
| 23 | 37 | 0 |
| 24 | 37 | 0 |
| 25 | 38 | 0 |
| 26 | 38 | 0 |
| 27 | 38 | 0 |
| 28 | 39 | 0 |
| 29 | 39 | 0 |
| 30 | 39 | 0 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 89% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 97 | 97 | 96 | 96 | 95 | 94 | 94 | 93 | 93 | 93 | 92 | 92 | 91 | 91 | 90 | 89 | 89 | 89 | 88 | 88 | 88 | 87 | 86 | 84 | 83 | 82 | 82 | 80 | 80 | 78 |
| Comfortable (%) | 3 | 3 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 13 | 13 | 14 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 7 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 97 | 3 | 0 | 0 |
| 2 | 97 | 3 | 0 | 0 |
| 3 | 96 | 4 | 0 | 0 |
| 4 | 96 | 4 | 0 | 0 |
| 5 | 95 | 5 | 0 | 0 |
| 6 | 94 | 5 | 1 | 0 |
| 7 | 94 | 5 | 1 | 0 |
| 8 | 93 | 6 | 1 | 0 |
| 9 | 93 | 6 | 1 | 0 |
| 10 | 93 | 6 | 1 | 0 |
| 11 | 92 | 7 | 1 | 0 |
| 12 | 92 | 7 | 1 | 0 |
| 13 | 91 | 8 | 1 | 0 |
| 14 | 91 | 8 | 1 | 0 |
| 15 | 90 | 9 | 1 | 0 |
| 16 | 89 | 9 | 2 | 0 |
| 17 | 89 | 9 | 2 | 0 |
| 18 | 89 | 9 | 2 | 0 |
| 19 | 88 | 10 | 2 | 0 |
| 20 | 88 | 10 | 2 | 0 |
| 21 | 88 | 10 | 2 | 0 |
| 22 | 87 | 10 | 3 | 0 |
| 23 | 86 | 11 | 3 | 0 |
| 24 | 84 | 11 | 4 | 1 |
| 25 | 83 | 12 | 4 | 1 |
| 26 | 82 | 12 | 5 | 1 |
| 27 | 82 | 12 | 5 | 1 |
| 28 | 80 | 13 | 6 | 1 |
| 29 | 80 | 13 | 6 | 1 |
| 30 | 78 | 14 | 7 | 1 |
Wind in April
Winds average 7 mph in April.
Across April, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 24 min at the start of April to 13 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 72 minutes over April. Sunrise moves from 6:03 AM to 5:20 AM, and sunset from 6:26 PM to 6:54 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.4 | 13.4 | 13.5 | 13.5 | 13.5 | 13.6 |
| Sunrise (AM) | 6:03 | 6:01 | 6:00 | 5:58 | 5:57 | 5:55 | 5:53 | 5:52 | 5:50 | 5:49 | 5:47 | 5:46 | 5:44 | 5:43 | 5:41 | 5:40 | 5:38 | 5:37 | 5:35 | 5:34 | 5:32 | 5:31 | 5:29 | 5:28 | 5:27 | 5:25 | 5:24 | 5:23 | 5:21 | 5:20 |
| Sunset (PM) | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:33 | 6:34 | 6:35 | 6:35 | 6:36 | 6:37 | 6:38 | 6:39 | 6:40 | 6:41 | 6:42 | 6:43 | 6:44 | 6:45 | 6:46 | 6:47 | 6:48 | 6:49 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:03 | 6:26 |
| 2 | 12.4 | 6:01 | 6:27 |
| 3 | 12.5 | 6:00 | 6:28 |
| 4 | 12.5 | 5:58 | 6:29 |
| 5 | 12.6 | 5:57 | 6:30 |
| 6 | 12.6 | 5:55 | 6:31 |
| 7 | 12.6 | 5:53 | 6:32 |
| 8 | 12.7 | 5:52 | 6:33 |
| 9 | 12.7 | 5:50 | 6:34 |
| 10 | 12.8 | 5:49 | 6:35 |
| 11 | 12.8 | 5:47 | 6:35 |
| 12 | 12.8 | 5:46 | 6:36 |
| 13 | 12.9 | 5:44 | 6:37 |
| 14 | 12.9 | 5:43 | 6:38 |
| 15 | 13.0 | 5:41 | 6:39 |
| 16 | 13.0 | 5:40 | 6:40 |
| 17 | 13.1 | 5:38 | 6:41 |
| 18 | 13.1 | 5:37 | 6:42 |
| 19 | 13.1 | 5:35 | 6:43 |
| 20 | 13.2 | 5:34 | 6:44 |
| 21 | 13.2 | 5:32 | 6:45 |
| 22 | 13.3 | 5:31 | 6:46 |
| 23 | 13.3 | 5:29 | 6:47 |
| 24 | 13.3 | 5:28 | 6:48 |
| 25 | 13.4 | 5:27 | 6:49 |
| 26 | 13.4 | 5:25 | 6:50 |
| 27 | 13.5 | 5:24 | 6:51 |
| 28 | 13.5 | 5:23 | 6:52 |
| 29 | 13.5 | 5:21 | 6:53 |
| 30 | 13.6 | 5:20 | 6:54 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 5.2 kWh/m².
For context, solar energy here swings from a low near 1.95 kWh/m² to a high of 6.15 kWh/m² in June across the year — April's 5.2 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.7 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.7 | Bright |
| 2 | 4.8 | Bright |
| 3 | 4.8 | Bright |
| 4 | 4.9 | Bright |
| 5 | 4.9 | Bright |
| 6 | 4.9 | Bright |
| 7 | 5.0 | Bright |
| 8 | 5.0 | Bright |
| 9 | 5.0 | Bright |
| 10 | 5.1 | Bright |
| 11 | 5.1 | Bright |
| 12 | 5.1 | Bright |
| 13 | 5.1 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.2 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.3 | Bright |
| 20 | 5.3 | Bright |
| 21 | 5.3 | Bright |
| 22 | 5.3 | Bright |
| 23 | 5.3 | Bright |
| 24 | 5.3 | Bright |
| 25 | 5.4 | Bright |
| 26 | 5.4 | Bright |
| 27 | 5.4 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.4 | Bright |
| 30 | 5.5 | Bright |
Is April a good time to visit Chantilly?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Chantilly for sightseeing.
What to pack for Chantilly in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Chantilly sees daytime highs around 66°F and nights near 46°F. Worth packing: a warm layer, rain gear and sun protection. About 10 days see rain.
UV index in Chantilly in April
Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chantilly peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | High |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Chantilly in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Chantilly is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 12 | 13 | 13 | 15 | 16 | 17 | 15 | 12 | 9 | 9 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 12 | Moderate |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Moderate |
| Oct | 9 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Chantilly?
Chantilly sits at 38.9°N, 77.4°W, 322 ft above sea level, in United States. The nearest listed city is Oak Hill, 2.5 mi away.
Topography around Chantilly
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Chantilly.
Within 2 miles, the terrain around Chantilly has only modest variations in elevation — a maximum elevation change of 180 ft around an average of 328 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 768 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,609 ft.
The land around Chantilly is covered by trees (51%) and artificial surfaces (34%) within 2 miles, trees (67%) within 10 miles, and trees (66%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chantilly (38.8943°, -77.4311°, elevation 322 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).