Sơn Tây weather in December
In December, Sơn Tây sees average daytime highs of 22°C and overnight lows near 16°C, with 29 mm of rain across 6.5 wet days and about 10.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.
Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 27% of the time in December, and the air most often feels dry.
Daylight stretches from about 10 h 48 min at the start of December to 10 h 42 min by month's end. Set against the rest of the year, December is Sơn Tây's 3rd-clearest and 12th-windiest month. For the whole year in context, see Sơn Tây's year-round climate.
- Daytime high
- 22°
- 10th warmest
- Overnight low
- 16°
- 2nd coldest
- Rainfall
- 29 mm
- 6.5 wet days
- Daylight
- 10 h 42 min
- 6:33 AM – 5:16 PM
- Cloud cover
- 62%
- 3rd clearest
- Wind
- 5 km/h
- 12th windiest
- Solar energy
- 2.54 kWh/m²
- Travel score
- 7.1
- out of 10
Sơn Tây is district-level town of Vietnam.
- Density
- 2,032/km²
- people per km²
- Founded
- 2009
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Highs ease over the month, from about 23°C in the first days to 21°C by the end.
A typical December day in Sơn Tây reaches about 22°C in the afternoon and slips back to 16°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 26°C. Set against its neighbours, December runs about 4°C cooler than November and about 2°C warmer than 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) | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Avg low (°C) | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 24 | 18 |
| 2 | 23 | 17 |
| 3 | 23 | 17 |
| 4 | 23 | 17 |
| 5 | 23 | 17 |
| 6 | 23 | 17 |
| 7 | 23 | 17 |
| 8 | 23 | 17 |
| 9 | 22 | 16 |
| 10 | 22 | 16 |
| 11 | 22 | 16 |
| 12 | 22 | 16 |
| 13 | 22 | 16 |
| 14 | 22 | 16 |
| 15 | 22 | 16 |
| 16 | 22 | 16 |
| 17 | 22 | 16 |
| 18 | 22 | 15 |
| 19 | 22 | 15 |
| 20 | 21 | 15 |
| 21 | 21 | 15 |
| 22 | 21 | 15 |
| 23 | 21 | 15 |
| 24 | 21 | 15 |
| 25 | 21 | 15 |
| 26 | 21 | 15 |
| 27 | 21 | 15 |
| 28 | 21 | 15 |
| 29 | 21 | 15 |
| 30 | 21 | 15 |
| 31 | 21 | 15 |
How December really feels in Sơn Tây
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Sơn Tây weather by month
How December compares with the rest of the year at a glance. December is the 10th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 20° / 15° | 37 | 8.3 | 10.9 | 6.2 |
| Feb | 22° / 16° | 26 | 7.9 | 11.3 | 6.5 |
| Mar | 25° / 19° | 48 | 10.4 | 11.9 | 6.4 |
| Apr | 29° / 22° | 81 | 10.7 | 12.5 | 5.2 |
| May | 32° / 25° | 201 | 17.4 | 13 | 3.2 |
| Jun | 33° / 27° | 215 | 18.2 | 13.3 | 2.4 |
| Jul | 33° / 27° | 251 | 20.5 | 13.2 | 2.4 |
| Aug | 33° / 26° | 311 | 22.1 | 12.7 | 2.5 |
| Sep | 32° / 25° | 201 | 17.9 | 12.1 | 3.3 |
| Oct | 29° / 23° | 100 | 10.5 | 11.5 | 5.4 |
| Nov | 26° / 19° | 48 | 6.7 | 11 | 7.2 |
| Dec | 22° / 16° | 29 | 6.5 | 10.7 | 7.1 |
Cloud cover in December
The sky is clear or mostly clear about 27% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 15% of December, 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 45 | 45 | 44 | 44 | 43 | 44 | 43 | 43 | 43 | 43 | 44 | 44 | 44 | 45 | 46 | 45 | 46 | 46 | 45 | 46 | 45 | 45 | 44 | 43 | 43 | 41 | 40 | 38 | 37 | 34 | 33 |
| Cloudier (%) | 55 | 55 | 56 | 56 | 57 | 56 | 57 | 57 | 57 | 57 | 56 | 56 | 56 | 55 | 54 | 55 | 54 | 54 | 55 | 54 | 55 | 55 | 56 | 57 | 57 | 59 | 60 | 62 | 63 | 66 | 67 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 45 | 55 |
| 2 | 45 | 55 |
| 3 | 44 | 56 |
| 4 | 44 | 56 |
| 5 | 43 | 57 |
| 6 | 44 | 56 |
| 7 | 43 | 57 |
| 8 | 43 | 57 |
| 9 | 43 | 57 |
| 10 | 43 | 57 |
| 11 | 44 | 56 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 45 | 55 |
| 15 | 46 | 54 |
| 16 | 45 | 55 |
| 17 | 46 | 54 |
| 18 | 46 | 54 |
| 19 | 45 | 55 |
| 20 | 46 | 54 |
| 21 | 45 | 55 |
| 22 | 45 | 55 |
| 23 | 44 | 56 |
| 24 | 43 | 57 |
| 25 | 43 | 57 |
| 26 | 41 | 59 |
| 27 | 40 | 60 |
| 28 | 38 | 62 |
| 29 | 37 | 63 |
| 30 | 34 | 66 |
| 31 | 33 | 67 |
Chance of precipitation in December
Sơn Tây gets around 29 mm of rain over 6.5 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 21% and peaks near 26% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 21 | 22 | 22 | 23 | 24 | 25 | 26 |
| Rain chance (%) | |
|---|---|
| 1 | 21 |
| 2 | 21 |
| 3 | 22 |
| 4 | 22 |
| 5 | 22 |
| 6 | 22 |
| 7 | 22 |
| 8 | 22 |
| 9 | 22 |
| 10 | 21 |
| 11 | 21 |
| 12 | 21 |
| 13 | 20 |
| 14 | 20 |
| 15 | 19 |
| 16 | 19 |
| 17 | 19 |
| 18 | 19 |
| 19 | 19 |
| 20 | 19 |
| 21 | 19 |
| 22 | 19 |
| 23 | 20 |
| 24 | 20 |
| 25 | 21 |
| 26 | 22 |
| 27 | 22 |
| 28 | 23 |
| 29 | 24 |
| 30 | 25 |
| 31 | 26 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 16% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 17 | 18 | 19 | 21 | 22 | 24 | 25 | 27 | 28 | 30 | 31 | 33 | 34 | 36 | 37 | 38 | 39 | 40 | 40 | 41 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 41 | 41 | 41 | 40 |
| Comfortable (%) | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 26 | 25 | 25 | 24 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 |
| Humid (%) | 29 | 29 | 28 | 28 | 27 | 26 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 25 | 25 | 26 | 26 | 27 | 28 | 28 | 28 | 28 | 28 |
| Muggy (%) | 19 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 12 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 10 | 10 | 11 | 11 |
| Oppressive (%) | 9 | 8 | 7 | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 17 | 27 | 29 | 19 | 9 |
| 2 | 18 | 27 | 29 | 18 | 8 |
| 3 | 19 | 28 | 28 | 17 | 7 |
| 4 | 21 | 28 | 28 | 17 | 7 |
| 5 | 22 | 29 | 27 | 16 | 6 |
| 6 | 24 | 29 | 26 | 16 | 5 |
| 7 | 25 | 29 | 26 | 15 | 5 |
| 8 | 27 | 29 | 25 | 15 | 4 |
| 9 | 28 | 29 | 25 | 15 | 4 |
| 10 | 30 | 29 | 24 | 15 | 3 |
| 11 | 31 | 28 | 24 | 14 | 2 |
| 12 | 33 | 28 | 23 | 14 | 2 |
| 13 | 34 | 27 | 23 | 14 | 2 |
| 14 | 36 | 26 | 23 | 14 | 1 |
| 15 | 37 | 25 | 23 | 14 | 1 |
| 16 | 38 | 25 | 23 | 14 | 1 |
| 17 | 39 | 24 | 23 | 14 | 1 |
| 18 | 40 | 23 | 23 | 13 | 1 |
| 19 | 40 | 23 | 23 | 13 | 1 |
| 20 | 41 | 22 | 23 | 12 | 1 |
| 21 | 42 | 22 | 24 | 12 | 1 |
| 22 | 42 | 22 | 25 | 11 | 1 |
| 23 | 42 | 21 | 25 | 11 | 1 |
| 24 | 42 | 21 | 26 | 10 | 0 |
| 25 | 42 | 21 | 26 | 10 | 0 |
| 26 | 42 | 21 | 27 | 9 | 0 |
| 27 | 42 | 21 | 28 | 9 | 0 |
| 28 | 41 | 21 | 28 | 10 | 0 |
| 29 | 41 | 21 | 28 | 10 | 0 |
| 30 | 41 | 20 | 28 | 11 | 0 |
| 31 | 40 | 20 | 28 | 11 | 0 |
Wind in December
Winds average 5 km/h in December, the calmest month.
Across December, daily wind ranges from about 5 km/h on the calmest days to 5 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) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in December
Daylight runs from about 10 h 48 min at the start of December to 10 h 42 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 6:24 AM to 6:39 AM, and sunset from 5:12 PM to 5:23 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) | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 |
| Sunrise (AM) | 6:24 | 6:24 | 6:25 | 6:25 | 6:26 | 6:27 | 6:27 | 6:28 | 6:29 | 6:29 | 6:30 | 6:30 | 6:31 | 6:31 | 6:32 | 6:33 | 6:33 | 6:34 | 6:34 | 6:35 | 6:35 | 6:36 | 6:36 | 6:36 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 | 6:39 | 6:39 |
| Sunset (PM) | 5:12 | 5:12 | 5:12 | 5:12 | 5:13 | 5:13 | 5:13 | 5:13 | 5:13 | 5:14 | 5:14 | 5:14 | 5:15 | 5:15 | 5:15 | 5:16 | 5:16 | 5:17 | 5:17 | 5:17 | 5:18 | 5:18 | 5:19 | 5:19 | 5:20 | 5:20 | 5:21 | 5:21 | 5:22 | 5:22 | 5:23 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.8 | 6:24 | 5:12 |
| 2 | 10.8 | 6:24 | 5:12 |
| 3 | 10.8 | 6:25 | 5:12 |
| 4 | 10.8 | 6:25 | 5:12 |
| 5 | 10.8 | 6:26 | 5:13 |
| 6 | 10.8 | 6:27 | 5:13 |
| 7 | 10.8 | 6:27 | 5:13 |
| 8 | 10.8 | 6:28 | 5:13 |
| 9 | 10.7 | 6:29 | 5:13 |
| 10 | 10.7 | 6:29 | 5:14 |
| 11 | 10.7 | 6:30 | 5:14 |
| 12 | 10.7 | 6:30 | 5:14 |
| 13 | 10.7 | 6:31 | 5:15 |
| 14 | 10.7 | 6:31 | 5:15 |
| 15 | 10.7 | 6:32 | 5:15 |
| 16 | 10.7 | 6:33 | 5:16 |
| 17 | 10.7 | 6:33 | 5:16 |
| 18 | 10.7 | 6:34 | 5:17 |
| 19 | 10.7 | 6:34 | 5:17 |
| 20 | 10.7 | 6:35 | 5:17 |
| 21 | 10.7 | 6:35 | 5:18 |
| 22 | 10.7 | 6:36 | 5:18 |
| 23 | 10.7 | 6:36 | 5:19 |
| 24 | 10.7 | 6:36 | 5:19 |
| 25 | 10.7 | 6:37 | 5:20 |
| 26 | 10.7 | 6:37 | 5:20 |
| 27 | 10.7 | 6:38 | 5:21 |
| 28 | 10.7 | 6:38 | 5:21 |
| 29 | 10.7 | 6:39 | 5:22 |
| 30 | 10.7 | 6:39 | 5:22 |
| 31 | 10.7 | 6:39 | 5:23 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 2.54 kWh/m².
For context, solar energy here swings from a low near 2.1 kWh/m² to a high of 4.78 kWh/m² in June across the year — December's 2.54 kWh/m² sits near the bottom.
| 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) | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 2.6 | Moderate |
| 2 | 2.6 | Moderate |
| 3 | 2.6 | Moderate |
| 4 | 2.6 | Moderate |
| 5 | 2.6 | Moderate |
| 6 | 2.6 | Moderate |
| 7 | 2.5 | Moderate |
| 8 | 2.5 | Moderate |
| 9 | 2.5 | Moderate |
| 10 | 2.5 | Moderate |
| 11 | 2.5 | Moderate |
| 12 | 2.5 | Moderate |
| 13 | 2.5 | Moderate |
| 14 | 2.5 | Moderate |
| 15 | 2.5 | Moderate |
| 16 | 2.5 | Moderate |
| 17 | 2.6 | Moderate |
| 18 | 2.6 | Moderate |
| 19 | 2.6 | Moderate |
| 20 | 2.6 | Moderate |
| 21 | 2.6 | Moderate |
| 22 | 2.6 | Moderate |
| 23 | 2.6 | Moderate |
| 24 | 2.5 | Moderate |
| 25 | 2.5 | Moderate |
| 26 | 2.5 | Moderate |
| 27 | 2.5 | Moderate |
| 28 | 2.5 | Moderate |
| 29 | 2.4 | Moderate |
| 30 | 2.4 | Moderate |
| 31 | 2.4 | Moderate |
Hazard calendar for Sơn Tây
In December, Sơn Tây sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Sơn Tây sits in the Pacific typhoon belt; the season peaks July–October.
Sơn Tây's monsoon runs May–September, when most of the year's rain falls.
Is December a good time to visit Sơn Tây?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is one of the better times to visit Sơn Tây for general sightseeing.
What to pack for Sơn Tây in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Sơn Tây sees daytime highs around 22°C and nights near 16°C. Little to plan around — just the basics. About 7 days see rain.
UV index in Sơn Tây in December
Clear-sky midday UV in December 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 Sơn Tây peaks around June 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 6 (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) | 6 | 7 | 9 | 6 | 7 | 11 | 10 | 9 | 7 | 8 | 6 | 6 |
| Level | High | High | Very high | High | Very high | Extreme | Extreme | Very high | High | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 7 | High |
| Mar | 9 | Very high |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 7 | High |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 6 | High |
Air quality in Sơn Tây 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 Sơn Tây is worst in December — around 171 µg/m³ PM2.5 (very unhealthy), about 3.4× the cleanest month (July, 50 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) | 161 | 136 | 122 | 106 | 76 | 59 | 50 | 68 | 96 | 125 | 152 | 171 |
| Level | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 161 | Very unhealthy |
| Feb | 136 | Unhealthy |
| Mar | 122 | Unhealthy |
| Apr | 106 | Unhealthy |
| May | 76 | Unhealthy |
| Jun | 59 | Unhealthy |
| Jul | 50 | Poor |
| Aug | 68 | Unhealthy |
| Sep | 96 | Unhealthy |
| Oct | 125 | Unhealthy |
| Nov | 152 | Very unhealthy |
| Dec | 171 | Very unhealthy |
Where is Sơn Tây?
Sơn Tây sits at 21.1°N, 105.5°E, 16 m above sea level, in Vietnam. The nearest listed city is Ba Vì, 14 km away.
Topography around Sơn Tây
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sơn Tây.
Within 3 km, the terrain around Sơn Tây has only modest variations in elevation — a maximum elevation change of 32 m around an average of 13 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 694 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,677 m.
The land around Sơn Tây is covered by trees (42%), artificial surfaces (22%) and cropland (21%) within 3 km, trees (44%) and cropland (33%) within 16 km, and trees (66%) and cropland (22%) within 80 km.
Vietnam travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / F
- 220 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,066
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 1.5
- per 100k, 2011
- Road deaths
- 30.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 500
- 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 Sơn Tây (21.1405°, 105.5069°, elevation 16 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).