San Onofre weather in December
In December, San Onofre sees average daytime highs of 30°C and overnight lows near 25°C, with 80 mm of rain across 14.3 wet days and about 11.4 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 34% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 11 h 30 min at the start of December to 11 h 24 min by month's end. Set against the rest of the year, December is San Onofre's 4th-clearest and 5th-windiest month. For the whole year in context, see San Onofre's year-round climate.
- Daytime high
- 30°
- 8th warmest
- Overnight low
- 25°
- 4th coldest
- Rainfall
- 80 mm
- 14.3 wet days
- Daylight
- 11 h 24 min
- 6:15 AM – 5:41 PM
- Cloud cover
- 58%
- 4th clearest
- Wind
- 8 km/h
- 5th windiest
- Solar energy
- 4.92 kWh/m²
- Travel score
- 4.7
- out of 10
Temperature in December
Day-to-day highs hold fairly steady near 30°C through the month.
A typical December day in San Onofre reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, December runs on par with November and on par with January.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 29 | 25 |
| 2 | 29 | 25 |
| 3 | 29 | 25 |
| 4 | 29 | 25 |
| 5 | 29 | 25 |
| 6 | 29 | 25 |
| 7 | 29 | 25 |
| 8 | 29 | 25 |
| 9 | 29 | 25 |
| 10 | 30 | 25 |
| 11 | 30 | 25 |
| 12 | 30 | 25 |
| 13 | 30 | 25 |
| 14 | 30 | 25 |
| 15 | 30 | 25 |
| 16 | 30 | 25 |
| 17 | 30 | 25 |
| 18 | 30 | 25 |
| 19 | 30 | 25 |
| 20 | 30 | 25 |
| 21 | 30 | 25 |
| 22 | 30 | 25 |
| 23 | 30 | 25 |
| 24 | 30 | 25 |
| 25 | 30 | 25 |
| 26 | 30 | 25 |
| 27 | 30 | 25 |
| 28 | 30 | 25 |
| 29 | 30 | 25 |
| 30 | 30 | 24 |
| 31 | 30 | 24 |
How December really feels in San Onofre
Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Onofre weather by month
How December compares with the rest of the year at a glance. December is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 24° | 19 | 5.1 | 11.5 | 5.6 |
| Feb | 31° / 25° | 20 | 5.6 | 11.7 | 5.1 |
| Mar | 31° / 25° | 43 | 12 | 11.9 | 4.5 |
| Apr | 30° / 25° | 119 | 22.3 | 12.2 | 3.4 |
| May | 30° / 25° | 220 | 28.2 | 12.4 | 2.9 |
| Jun | 30° / 25° | 210 | 26.1 | 12.6 | 2.9 |
| Jul | 30° / 25° | 189 | 25.7 | 12.5 | 3.0 |
| Aug | 30° / 25° | 207 | 27.3 | 12.3 | 2.9 |
| Sep | 29° / 25° | 220 | 28.2 | 12.1 | 2.9 |
| Oct | 29° / 25° | 251 | 29 | 11.8 | 3.0 |
| Nov | 29° / 25° | 190 | 25.1 | 11.6 | 3.4 |
| Dec | 30° / 25° | 80 | 14.3 | 11.4 | 4.7 |
Cloud cover in December
The sky is clear or mostly clear about 34% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to open up 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 35 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 39 | 40 | 41 | 41 | 43 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 57 | 59 | 61 | 62 | 64 | 65 | 66 | 67 | 67 | 68 | 69 |
| Cloudier (%) | 65 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 61 | 60 | 59 | 59 | 57 | 56 | 54 | 52 | 50 | 48 | 46 | 44 | 43 | 41 | 39 | 38 | 36 | 35 | 34 | 33 | 33 | 32 | 31 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 35 | 65 |
| 2 | 36 | 64 |
| 3 | 36 | 64 |
| 4 | 36 | 64 |
| 5 | 37 | 63 |
| 6 | 37 | 63 |
| 7 | 37 | 63 |
| 8 | 37 | 63 |
| 9 | 39 | 61 |
| 10 | 40 | 60 |
| 11 | 41 | 59 |
| 12 | 41 | 59 |
| 13 | 43 | 57 |
| 14 | 44 | 56 |
| 15 | 46 | 54 |
| 16 | 48 | 52 |
| 17 | 50 | 50 |
| 18 | 52 | 48 |
| 19 | 54 | 46 |
| 20 | 56 | 44 |
| 21 | 57 | 43 |
| 22 | 59 | 41 |
| 23 | 61 | 39 |
| 24 | 62 | 38 |
| 25 | 64 | 36 |
| 26 | 65 | 35 |
| 27 | 66 | 34 |
| 28 | 67 | 33 |
| 29 | 67 | 33 |
| 30 | 68 | 32 |
| 31 | 69 | 31 |
Chance of precipitation in December
San Onofre gets around 80 mm of rain over 14.3 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 47% and peaks near 68% on the wettest days. The odds ease toward the end of the month.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 68 | 67 | 65 | 64 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 52 | 50 | 48 | 46 | 45 | 43 | 41 | 39 | 38 | 36 | 35 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 27 |
| Rain chance (%) | |
|---|---|
| 1 | 68 |
| 2 | 67 |
| 3 | 65 |
| 4 | 64 |
| 5 | 63 |
| 6 | 62 |
| 7 | 61 |
| 8 | 60 |
| 9 | 58 |
| 10 | 57 |
| 11 | 55 |
| 12 | 54 |
| 13 | 52 |
| 14 | 50 |
| 15 | 48 |
| 16 | 46 |
| 17 | 45 |
| 18 | 43 |
| 19 | 41 |
| 20 | 39 |
| 21 | 38 |
| 22 | 36 |
| 23 | 35 |
| 24 | 33 |
| 25 | 32 |
| 26 | 31 |
| 27 | 30 |
| 28 | 29 |
| 29 | 28 |
| 30 | 27 |
| 31 | 27 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 62% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 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 | 2 | 2 | 2 |
| Oppressive (%) | 55 | 55 | 55 | 55 | 56 | 56 | 57 | 57 | 58 | 58 | 59 | 59 | 60 | 60 | 61 | 62 | 62 | 63 | 64 | 64 | 65 | 66 | 65 | 66 | 66 | 67 | 68 | 69 | 69 | 71 | 72 |
| Miserable (%) | 45 | 45 | 45 | 45 | 44 | 44 | 43 | 43 | 42 | 42 | 41 | 41 | 40 | 40 | 39 | 38 | 38 | 37 | 36 | 36 | 35 | 34 | 34 | 33 | 33 | 32 | 31 | 30 | 29 | 27 | 26 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| 1 | 0 | 55 | 45 |
| 2 | 0 | 55 | 45 |
| 3 | 0 | 55 | 45 |
| 4 | 0 | 55 | 45 |
| 5 | 0 | 56 | 44 |
| 6 | 0 | 56 | 44 |
| 7 | 0 | 57 | 43 |
| 8 | 0 | 57 | 43 |
| 9 | 0 | 58 | 42 |
| 10 | 0 | 58 | 42 |
| 11 | 0 | 59 | 41 |
| 12 | 0 | 59 | 41 |
| 13 | 0 | 60 | 40 |
| 14 | 0 | 60 | 40 |
| 15 | 0 | 61 | 39 |
| 16 | 0 | 62 | 38 |
| 17 | 0 | 62 | 38 |
| 18 | 0 | 63 | 37 |
| 19 | 0 | 64 | 36 |
| 20 | 0 | 64 | 36 |
| 21 | 0 | 65 | 35 |
| 22 | 0 | 66 | 34 |
| 23 | 1 | 65 | 34 |
| 24 | 1 | 66 | 33 |
| 25 | 1 | 66 | 33 |
| 26 | 1 | 67 | 32 |
| 27 | 1 | 68 | 31 |
| 28 | 1 | 69 | 30 |
| 29 | 2 | 69 | 29 |
| 30 | 2 | 71 | 27 |
| 31 | 2 | 72 | 26 |
Wind in December
Winds average 8 km/h in December.
Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| 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 | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 8 | calm |
| 2 | 8 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
| 31 | 9 | calm |
Sunrise & sunset in December
Daylight runs from about 11 h 30 min at the start of December to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over December. Sunrise moves from 6:08 AM to 6:22 AM, and sunset from 5:36 PM to 5:48 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 |
| Sunrise (AM) | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 |
| Sunset (PM) | 5:36 | 5:36 | 5:37 | 5:37 | 5:37 | 5:37 | 5:38 | 5:38 | 5:39 | 5:39 | 5:39 | 5:40 | 5:40 | 5:40 | 5:41 | 5:41 | 5:42 | 5:42 | 5:43 | 5:43 | 5:44 | 5:44 | 5:44 | 5:45 | 5:45 | 5:46 | 5:46 | 5:47 | 5:47 | 5:48 | 5:48 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.5 | 6:08 | 5:36 |
| 2 | 11.5 | 6:08 | 5:36 |
| 3 | 11.5 | 6:09 | 5:37 |
| 4 | 11.5 | 6:09 | 5:37 |
| 5 | 11.5 | 6:10 | 5:37 |
| 6 | 11.5 | 6:10 | 5:37 |
| 7 | 11.5 | 6:11 | 5:38 |
| 8 | 11.4 | 6:11 | 5:38 |
| 9 | 11.4 | 6:12 | 5:39 |
| 10 | 11.4 | 6:12 | 5:39 |
| 11 | 11.4 | 6:13 | 5:39 |
| 12 | 11.4 | 6:13 | 5:40 |
| 13 | 11.4 | 6:14 | 5:40 |
| 14 | 11.4 | 6:14 | 5:40 |
| 15 | 11.4 | 6:15 | 5:41 |
| 16 | 11.4 | 6:15 | 5:41 |
| 17 | 11.4 | 6:16 | 5:42 |
| 18 | 11.4 | 6:16 | 5:42 |
| 19 | 11.4 | 6:17 | 5:43 |
| 20 | 11.4 | 6:17 | 5:43 |
| 21 | 11.4 | 6:18 | 5:44 |
| 22 | 11.4 | 6:18 | 5:44 |
| 23 | 11.4 | 6:19 | 5:44 |
| 24 | 11.4 | 6:19 | 5:45 |
| 25 | 11.4 | 6:20 | 5:45 |
| 26 | 11.4 | 6:20 | 5:46 |
| 27 | 11.4 | 6:20 | 5:46 |
| 28 | 11.4 | 6:21 | 5:47 |
| 29 | 11.4 | 6:21 | 5:47 |
| 30 | 11.4 | 6:22 | 5:48 |
| 31 | 11.4 | 6:22 | 5:48 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 4.92 kWh/m².
For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 5.97 kWh/m² in March across the year — December's 4.92 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 |
| 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 | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.7 | Bright |
| 4 | 4.7 | Bright |
| 5 | 4.7 | Bright |
| 6 | 4.7 | Bright |
| 7 | 4.7 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.8 | Bright |
| 10 | 4.8 | Bright |
| 11 | 4.8 | Bright |
| 12 | 4.8 | Bright |
| 13 | 4.8 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.9 | Bright |
| 16 | 4.9 | Bright |
| 17 | 4.9 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.0 | Bright |
| 21 | 5.0 | Bright |
| 22 | 5.0 | Bright |
| 23 | 5.1 | Bright |
| 24 | 5.1 | Bright |
| 25 | 5.1 | Bright |
| 26 | 5.1 | Bright |
| 27 | 5.2 | Bright |
| 28 | 5.2 | Bright |
| 29 | 5.2 | Bright |
| 30 | 5.2 | Bright |
| 31 | 5.2 | Bright |
Is December a good time to visit San Onofre?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit San Onofre for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Onofre in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, San Onofre sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 14 days see rain.
Sea temperature near San Onofre in December
The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 16 km away) is warmest in July at about 30°C and coldest in March near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 28 | 28 | 29 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in San Onofre in December
Clear-sky midday UV in December peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Onofre peaks around June 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 10 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 12 | 12 | 12 | 13 | 13 | 11 | 12 | 12 | 12 | 10 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 12 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 13 | Extreme |
| Jun | 13 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Very high |
| Dec | 10 | Very high |
Air quality in San Onofre in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in San Onofre is worst in July — around 26 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 11 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) | 14 | 18 | 26 | 25 | 25 | 23 | 26 | 20 | 14 | 12 | 11 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 18 | Moderate |
| Mar | 26 | Moderate |
| Apr | 25 | Moderate |
| May | 25 | Moderate |
| Jun | 23 | Moderate |
| Jul | 26 | Moderate |
| Aug | 20 | Moderate |
| Sep | 14 | Moderate |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 14 | Moderate |
Where is San Onofre?
San Onofre sits at 9.7°N, 75.5°W, 37 m above sea level, in Colombia. The nearest listed city is Santiago de Tolú, 24 km away.
Topography around San Onofre
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Onofre.
Within 3 km, the terrain around San Onofre has only modest variations in elevation — a maximum elevation change of 53 m around an average of 27 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 232 m; within 80 km, large variations in elevation — a maximum elevation change of 810 m.
The land around San Onofre is covered by grassland (79%) within 3 km, grassland (52%) and trees (33%) within 16 km, and grassland (39%), water (32%) and trees (23%) within 80 km.
Colombia travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type A / B
- 120 / 240 V · 60 Hz
- Prices
- ≈ 38% of US
- price level, 2025
- GDP per capita
- $8,562
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 74%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 15.4
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 480
- 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 San Onofre (9.7359°, -75.5263°, elevation 37 m), 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).