La Crescenta-Montrose weather in September
In September, La Crescenta-Montrose sees average daytime highs of 85°F and overnight lows near 62°F, with 0.2 in of rain across 0.9 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.
Highs ease over the month, from about 88°F in the first days to 83°F by the end. The sky is clear or mostly clear about 87% of the time in September, and the air most often feels dry.
Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is La Crescenta-Montrose's 2nd-clearest and 12th-windiest month. For the whole year in context, see La Crescenta-Montrose's year-round climate.
- Daytime high
- 85°
- 3rd warmest
- Overnight low
- 62°
- 10th coldest
- Rainfall
- 0.2 in
- 0.9 wet days
- Daylight
- 12 h 12 min
- 5:41 AM – 5:54 PM
- Cloud cover
- 14%
- 2nd clearest
- Wind
- 4 mph
- 12th windiest
- Solar energy
- 6.23 kWh/m²
- Travel score
- 7.0
- out of 10
La Crescenta-Montrose is census-designated place in Los Angeles County, California, United States.
- Density
- 2,208/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 88°F in the first days to 83°F by the end.
A typical September day in La Crescenta-Montrose reaches about 85°F in the afternoon and slips back to 62°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 95°F. Set against its neighbours, September runs about 3°F cooler than August and about 7°F warmer than October.
| 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) | 88 | 88 | 88 | 88 | 87 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 84 | 84 | 84 | 84 | 84 | 84 | 83 | 83 | 83 | 83 | 82 |
| Avg low (°F) | 65 | 65 | 65 | 65 | 64 | 64 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 62 | 62 | 62 | 62 | 62 | 61 | 61 | 61 | 61 | 61 | 61 | 60 | 60 | 60 | 60 | 60 | 59 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 88 | 65 |
| 2 | 88 | 65 |
| 3 | 88 | 65 |
| 4 | 88 | 65 |
| 5 | 87 | 64 |
| 6 | 87 | 64 |
| 7 | 87 | 64 |
| 8 | 87 | 64 |
| 9 | 87 | 64 |
| 10 | 86 | 63 |
| 11 | 86 | 63 |
| 12 | 86 | 63 |
| 13 | 85 | 63 |
| 14 | 85 | 62 |
| 15 | 85 | 62 |
| 16 | 85 | 62 |
| 17 | 85 | 62 |
| 18 | 85 | 62 |
| 19 | 85 | 61 |
| 20 | 84 | 61 |
| 21 | 84 | 61 |
| 22 | 84 | 61 |
| 23 | 84 | 61 |
| 24 | 84 | 61 |
| 25 | 84 | 60 |
| 26 | 83 | 60 |
| 27 | 83 | 60 |
| 28 | 83 | 60 |
| 29 | 83 | 60 |
| 30 | 82 | 59 |
La Crescenta-Montrose weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 62° / 44° | 3.4 | 5.8 | 10 | 6.1 |
| Feb | 63° / 44° | 3.7 | 6.7 | 10.7 | 6.1 |
| Mar | 66° / 46° | 2.5 | 6.1 | 11.7 | 6.9 |
| Apr | 71° / 49° | 1.0 | 3.6 | 12.8 | 7.9 |
| May | 75° / 54° | 0.5 | 2.3 | 13.8 | 8.8 |
| Jun | 81° / 59° | 0.1 | 0.5 | 14.2 | 8.4 |
| Jul | 87° / 64° | 0.1 | 0.6 | 14.1 | 6.4 |
| Aug | 89° / 65° | 0.0 | 0.2 | 13.3 | 5.9 |
| Sep | 85° / 62° | 0.2 | 0.9 | 12.2 | 7.0 |
| Oct | 78° / 56° | 0.7 | 2.3 | 11.1 | 8.7 |
| Nov | 69° / 48° | 0.9 | 3 | 10.2 | 7.9 |
| Dec | 62° / 43° | 2.3 | 5.2 | 9.8 | 6.1 |
Cloud cover in September
The sky is clear or mostly clear about 87% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 7%. Skies tend to cloud over as the month goes on.
| 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 (%) | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 94 | 93 | 93 | 93 | 93 | 93 | 92 | 92 | 92 | 91 | 91 | 91 | 91 | 91 | 90 | 90 |
| Cloudier (%) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 94 | 6 |
| 2 | 94 | 6 |
| 3 | 94 | 6 |
| 4 | 94 | 6 |
| 5 | 94 | 6 |
| 6 | 94 | 6 |
| 7 | 94 | 6 |
| 8 | 94 | 6 |
| 9 | 94 | 6 |
| 10 | 94 | 6 |
| 11 | 94 | 6 |
| 12 | 94 | 6 |
| 13 | 94 | 6 |
| 14 | 94 | 6 |
| 15 | 94 | 6 |
| 16 | 93 | 7 |
| 17 | 93 | 7 |
| 18 | 93 | 7 |
| 19 | 93 | 7 |
| 20 | 93 | 7 |
| 21 | 92 | 8 |
| 22 | 92 | 8 |
| 23 | 92 | 8 |
| 24 | 91 | 9 |
| 25 | 91 | 9 |
| 26 | 91 | 9 |
| 27 | 91 | 9 |
| 28 | 91 | 9 |
| 29 | 90 | 10 |
| 30 | 90 | 10 |
Chance of precipitation in September
La Crescenta-Montrose gets around 0.2 in of rain over 0.9 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 3% and peaks near 4% on the wettest days.
| 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 (%) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 |
| Rain chance (%) | |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 3 |
| 4 | 3 |
| 5 | 3 |
| 6 | 3 |
| 7 | 3 |
| 8 | 3 |
| 9 | 3 |
| 10 | 3 |
| 11 | 3 |
| 12 | 3 |
| 13 | 3 |
| 14 | 3 |
| 15 | 3 |
| 16 | 3 |
| 17 | 3 |
| 18 | 3 |
| 19 | 3 |
| 20 | 3 |
| 21 | 3 |
| 22 | 3 |
| 23 | 3 |
| 24 | 3 |
| 25 | 3 |
| 26 | 3 |
| 27 | 3 |
| 28 | 4 |
| 29 | 4 |
| 30 | 4 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 71% 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 (%) | 58 | 58 | 59 | 60 | 60 | 61 | 63 | 63 | 64 | 66 | 66 | 68 | 70 | 71 | 72 | 73 | 74 | 74 | 76 | 76 | 77 | 77 | 78 | 79 | 79 | 80 | 80 | 80 | 82 | 82 |
| Comfortable (%) | 33 | 33 | 32 | 31 | 31 | 30 | 29 | 29 | 28 | 27 | 27 | 26 | 25 | 24 | 24 | 23 | 22 | 22 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 17 |
| Humid (%) | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 |
| Muggy (%) | 1 | 1 | 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 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 58 | 33 | 8 | 1 |
| 2 | 58 | 33 | 8 | 1 |
| 3 | 59 | 32 | 8 | 1 |
| 4 | 60 | 31 | 8 | 1 |
| 5 | 60 | 31 | 8 | 1 |
| 6 | 61 | 30 | 8 | 1 |
| 7 | 63 | 29 | 7 | 1 |
| 8 | 63 | 29 | 7 | 1 |
| 9 | 64 | 28 | 7 | 1 |
| 10 | 66 | 27 | 6 | 1 |
| 11 | 66 | 27 | 6 | 1 |
| 12 | 68 | 26 | 5 | 1 |
| 13 | 70 | 25 | 5 | 0 |
| 14 | 71 | 24 | 5 | 0 |
| 15 | 72 | 24 | 4 | 0 |
| 16 | 73 | 23 | 4 | 0 |
| 17 | 74 | 22 | 4 | 0 |
| 18 | 74 | 22 | 4 | 0 |
| 19 | 76 | 21 | 3 | 0 |
| 20 | 76 | 21 | 3 | 0 |
| 21 | 77 | 20 | 3 | 0 |
| 22 | 77 | 20 | 3 | 0 |
| 23 | 78 | 19 | 3 | 0 |
| 24 | 79 | 19 | 2 | 0 |
| 25 | 79 | 19 | 2 | 0 |
| 26 | 80 | 18 | 2 | 0 |
| 27 | 80 | 18 | 2 | 0 |
| 28 | 80 | 18 | 2 | 0 |
| 29 | 82 | 17 | 1 | 0 |
| 30 | 82 | 17 | 1 | 0 |
Wind in September
Winds average 4 mph in September, the calmest month.
Across September, daily wind ranges from about 4 mph on the calmest days to 4 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) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| 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 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 60 minutes over September. Sunrise moves from 5:30 AM to 5:51 AM, and sunset from 6:15 PM to 5:33 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) | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 | 11.7 | 11.7 |
| Sunrise (AM) | 5:30 | 5:31 | 5:32 | 5:32 | 5:33 | 5:34 | 5:34 | 5:35 | 5:36 | 5:37 | 5:37 | 5:38 | 5:39 | 5:40 | 5:40 | 5:41 | 5:42 | 5:42 | 5:43 | 5:44 | 5:45 | 5:45 | 5:46 | 5:47 | 5:48 | 5:48 | 5:49 | 5:50 | 5:51 | 5:51 |
| Sunset (PM) | 6:15 | 6:14 | 6:12 | 6:11 | 6:10 | 6:08 | 6:07 | 6:05 | 6:04 | 6:02 | 6:01 | 5:59 | 5:58 | 5:57 | 5:55 | 5:54 | 5:52 | 5:51 | 5:49 | 5:48 | 5:46 | 5:45 | 5:43 | 5:42 | 5:40 | 5:39 | 5:38 | 5:36 | 5:35 | 5:33 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.7 | 5:30 | 6:15 |
| 2 | 12.7 | 5:31 | 6:14 |
| 3 | 12.7 | 5:32 | 6:12 |
| 4 | 12.6 | 5:32 | 6:11 |
| 5 | 12.6 | 5:33 | 6:10 |
| 6 | 12.6 | 5:34 | 6:08 |
| 7 | 12.5 | 5:34 | 6:07 |
| 8 | 12.5 | 5:35 | 6:05 |
| 9 | 12.5 | 5:36 | 6:04 |
| 10 | 12.4 | 5:37 | 6:02 |
| 11 | 12.4 | 5:37 | 6:01 |
| 12 | 12.4 | 5:38 | 5:59 |
| 13 | 12.3 | 5:39 | 5:58 |
| 14 | 12.3 | 5:40 | 5:57 |
| 15 | 12.2 | 5:40 | 5:55 |
| 16 | 12.2 | 5:41 | 5:54 |
| 17 | 12.2 | 5:42 | 5:52 |
| 18 | 12.1 | 5:42 | 5:51 |
| 19 | 12.1 | 5:43 | 5:49 |
| 20 | 12.1 | 5:44 | 5:48 |
| 21 | 12.0 | 5:45 | 5:46 |
| 22 | 12.0 | 5:45 | 5:45 |
| 23 | 12.0 | 5:46 | 5:43 |
| 24 | 11.9 | 5:47 | 5:42 |
| 25 | 11.9 | 5:48 | 5:40 |
| 26 | 11.8 | 5:48 | 5:39 |
| 27 | 11.8 | 5:49 | 5:38 |
| 28 | 11.8 | 5:50 | 5:36 |
| 29 | 11.7 | 5:51 | 5:35 |
| 30 | 11.7 | 5:51 | 5:33 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.23 kWh/m².
For context, solar energy here swings from a low near 2.95 kWh/m² to a high of 8.15 kWh/m² in June across the year — September's 6.23 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) | 6.8 | 6.8 | 6.8 | 6.7 | 6.7 | 6.6 | 6.6 | 6.6 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.2 | 6.2 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.8 | 5.8 | 5.7 | 5.7 | 5.6 | 5.6 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.8 | Intense |
| 2 | 6.8 | Intense |
| 3 | 6.8 | Intense |
| 4 | 6.7 | Intense |
| 5 | 6.7 | Intense |
| 6 | 6.6 | Intense |
| 7 | 6.6 | Intense |
| 8 | 6.6 | Intense |
| 9 | 6.5 | Intense |
| 10 | 6.5 | Intense |
| 11 | 6.4 | Intense |
| 12 | 6.4 | Intense |
| 13 | 6.4 | Intense |
| 14 | 6.3 | Intense |
| 15 | 6.3 | Intense |
| 16 | 6.2 | Intense |
| 17 | 6.2 | Intense |
| 18 | 6.1 | Intense |
| 19 | 6.1 | Intense |
| 20 | 6.0 | Intense |
| 21 | 6.0 | Intense |
| 22 | 6.0 | Bright |
| 23 | 5.9 | Bright |
| 24 | 5.9 | Bright |
| 25 | 5.8 | Bright |
| 26 | 5.8 | Bright |
| 27 | 5.7 | Bright |
| 28 | 5.7 | Bright |
| 29 | 5.6 | Bright |
| 30 | 5.6 | Bright |
Is September a good time to visit La Crescenta-Montrose?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit La Crescenta-Montrose for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for La Crescenta-Montrose in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, La Crescenta-Montrose sees daytime highs around 85°F and nights near 62°F. Pack light clothes and sun protection.
Sea temperature near La Crescenta-Montrose in September
The nearest coast averages about 68°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 26 mi away) is warmest in August at about 68°F and coldest in February near 59°F.
It's comfortable for a long swim from Aug 4 to Sep 13 — about 1.3 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 59 | 59 | 59 | 59 | 62 | 65 | 67 | 68 | 68 | 66 | 63 | 60 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 59 | Bracing |
| Feb | 59 | Bracing |
| Mar | 59 | Bracing |
| Apr | 59 | Cool |
| May | 62 | Cool |
| Jun | 65 | Cool |
| Jul | 67 | Cool |
| Aug | 68 | Refreshing |
| Sep | 68 | Refreshing |
| Oct | 66 | Cool |
| Nov | 63 | Cool |
| Dec | 60 | Cool |
UV index in La Crescenta-Montrose in September
Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in La Crescenta-Montrose peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 11 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in La Crescenta-Montrose in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in La Crescenta-Montrose is worst in December — around 29 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (May, 12 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) | 18 | 17 | 17 | 15 | 12 | 14 | 25 | 26 | 24 | 18 | 23 | 29 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 17 | Moderate |
| Mar | 17 | Moderate |
| Apr | 15 | Moderate |
| May | 12 | Good |
| Jun | 14 | Moderate |
| Jul | 25 | Moderate |
| Aug | 26 | Moderate |
| Sep | 24 | Moderate |
| Oct | 18 | Moderate |
| Nov | 23 | Moderate |
| Dec | 29 | Moderate |
Where is La Crescenta-Montrose?
La Crescenta-Montrose sits at 34.2°N, 118.2°W, 1,841 ft above sea level, in United States. The nearest listed city is Tujunga, 3.1 mi away.
Topography around La Crescenta-Montrose
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of La Crescenta-Montrose.
Within 2 miles, the terrain around La Crescenta-Montrose has large variations in elevation — a maximum elevation change of 3,353 ft around an average of 2,129 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,873 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.
The land around La Crescenta-Montrose is covered by trees (42%), artificial surfaces (37%) and shrubs (20%) within 2 miles, trees (31%), shrubs (31%) and artificial surfaces (29%) within 10 miles, and grassland (23%) and artificial surfaces (22%) 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 La Crescenta-Montrose (34.2322°, -118.2353°, elevation 1,841 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).