Long Mỹ weather in December
In December, Long Mỹ sees average daytime highs of 30°C and overnight lows near 23°C, with 81 mm of rain across 10.4 wet days and about 11.4 hours of daylight. It is the 12th-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 14% 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 Long Mỹ's 5th-clearest and 8th-windiest month. For the whole year in context, see Long Mỹ's year-round climate.
- Daytime high
- 30°
- 12th warmest
- Overnight low
- 23°
- 3rd coldest
- Rainfall
- 81 mm
- 10.4 wet days
- Daylight
- 11 h 24 min
- 6:11 AM – 5:37 PM
- Cloud cover
- 73%
- 5th clearest
- Wind
- 9 km/h
- 8th windiest
- Solar energy
- 4.4 kWh/m²
- Travel score
- 4.8
- out of 10
Temperature in December
Day-to-day highs hold fairly steady near 30°C through the month.
A typical December day in Long Mỹ reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, December runs about 1°C cooler than 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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 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) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 24 |
| 2 | 30 | 24 |
| 3 | 30 | 24 |
| 4 | 30 | 24 |
| 5 | 30 | 24 |
| 6 | 30 | 24 |
| 7 | 30 | 24 |
| 8 | 30 | 24 |
| 9 | 30 | 24 |
| 10 | 30 | 24 |
| 11 | 30 | 24 |
| 12 | 30 | 23 |
| 13 | 30 | 23 |
| 14 | 30 | 23 |
| 15 | 30 | 23 |
| 16 | 30 | 23 |
| 17 | 30 | 23 |
| 18 | 30 | 23 |
| 19 | 30 | 23 |
| 20 | 30 | 23 |
| 21 | 30 | 23 |
| 22 | 30 | 23 |
| 23 | 30 | 23 |
| 24 | 30 | 23 |
| 25 | 30 | 23 |
| 26 | 30 | 23 |
| 27 | 30 | 23 |
| 28 | 30 | 23 |
| 29 | 30 | 23 |
| 30 | 30 | 23 |
| 31 | 30 | 23 |
How December really feels in Long Mỹ
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.
Long Mỹ weather by month
How December compares with the rest of the year at a glance. December is the 12th-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° / 23° | 27 | 4.8 | 11.5 | 5.5 |
| Feb | 31° / 23° | 13 | 2.7 | 11.7 | 5.1 |
| Mar | 33° / 25° | 44 | 6.6 | 11.9 | 3.8 |
| Apr | 34° / 26° | 97 | 13.6 | 12.2 | 2.8 |
| May | 33° / 26° | 231 | 26.4 | 12.4 | 2.2 |
| Jun | 31° / 25° | 259 | 27.6 | 12.6 | 2.4 |
| Jul | 31° / 25° | 266 | 29.3 | 12.5 | 2.5 |
| Aug | 31° / 25° | 259 | 29.2 | 12.3 | 2.5 |
| Sep | 31° / 25° | 296 | 28.7 | 12.1 | 2.4 |
| Oct | 31° / 24° | 323 | 28 | 11.8 | 2.6 |
| Nov | 31° / 24° | 165 | 19 | 11.6 | 3.5 |
| Dec | 30° / 23° | 81 | 10.4 | 11.4 | 4.8 |
Cloud cover in December
The sky is clear or mostly clear about 14% 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 71%.
| 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 (%) | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 28 | 29 | 29 | 29 | 30 | 30 | 31 | 33 | 33 | 34 |
| Cloudier (%) | 72 | 72 | 71 | 71 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 71 | 71 | 70 | 71 | 71 | 72 | 72 | 73 | 73 | 73 | 72 | 71 | 71 | 71 | 70 | 70 | 69 | 67 | 67 | 66 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 28 | 72 |
| 2 | 28 | 72 |
| 3 | 29 | 71 |
| 4 | 29 | 71 |
| 5 | 29 | 71 |
| 6 | 29 | 71 |
| 7 | 29 | 71 |
| 8 | 29 | 71 |
| 9 | 30 | 70 |
| 10 | 30 | 70 |
| 11 | 30 | 70 |
| 12 | 29 | 71 |
| 13 | 29 | 71 |
| 14 | 30 | 70 |
| 15 | 29 | 71 |
| 16 | 29 | 71 |
| 17 | 28 | 72 |
| 18 | 28 | 72 |
| 19 | 27 | 73 |
| 20 | 27 | 73 |
| 21 | 27 | 73 |
| 22 | 28 | 72 |
| 23 | 29 | 71 |
| 24 | 29 | 71 |
| 25 | 29 | 71 |
| 26 | 30 | 70 |
| 27 | 30 | 70 |
| 28 | 31 | 69 |
| 29 | 33 | 67 |
| 30 | 33 | 67 |
| 31 | 34 | 66 |
Chance of precipitation in December
Long Mỹ gets around 81 mm of rain over 10.4 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 34% and peaks near 49% 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 (%) | 49 | 47 | 46 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 37 | 36 | 35 | 34 | 34 | 33 | 32 | 31 | 31 | 30 | 29 | 28 | 28 | 27 | 26 | 26 | 25 | 24 | 24 | 23 |
| Rain chance (%) | |
|---|---|
| 1 | 49 |
| 2 | 47 |
| 3 | 46 |
| 4 | 44 |
| 5 | 43 |
| 6 | 42 |
| 7 | 41 |
| 8 | 40 |
| 9 | 39 |
| 10 | 38 |
| 11 | 37 |
| 12 | 37 |
| 13 | 36 |
| 14 | 35 |
| 15 | 34 |
| 16 | 34 |
| 17 | 33 |
| 18 | 32 |
| 19 | 31 |
| 20 | 31 |
| 21 | 30 |
| 22 | 29 |
| 23 | 28 |
| 24 | 28 |
| 25 | 27 |
| 26 | 26 |
| 27 | 26 |
| 28 | 25 |
| 29 | 24 |
| 30 | 24 |
| 31 | 23 |
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 97% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| Humid (%) | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 |
| Muggy (%) | 11 | 12 | 12 | 13 | 13 | 14 | 14 | 14 | 15 | 16 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Oppressive (%) | 58 | 58 | 59 | 59 | 60 | 61 | 62 | 63 | 63 | 64 | 65 | 64 | 64 | 64 | 64 | 64 | 63 | 63 | 63 | 62 | 62 | 61 | 61 | 60 | 60 | 60 | 60 | 61 | 61 | 62 | 63 |
| Miserable (%) | 30 | 29 | 28 | 26 | 25 | 23 | 22 | 21 | 20 | 18 | 17 | 16 | 15 | 13 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 1 | 11 | 58 | 30 |
| 2 | 0 | 1 | 12 | 58 | 29 |
| 3 | 0 | 1 | 12 | 59 | 28 |
| 4 | 0 | 2 | 13 | 59 | 26 |
| 5 | 0 | 2 | 13 | 60 | 25 |
| 6 | 0 | 2 | 14 | 61 | 23 |
| 7 | 0 | 2 | 14 | 62 | 22 |
| 8 | 0 | 2 | 14 | 63 | 21 |
| 9 | 0 | 2 | 15 | 63 | 20 |
| 10 | 0 | 2 | 16 | 64 | 18 |
| 11 | 0 | 2 | 16 | 65 | 17 |
| 12 | 0 | 3 | 17 | 64 | 16 |
| 13 | 0 | 3 | 18 | 64 | 15 |
| 14 | 1 | 3 | 19 | 64 | 13 |
| 15 | 1 | 3 | 20 | 64 | 12 |
| 16 | 1 | 3 | 21 | 64 | 11 |
| 17 | 1 | 3 | 22 | 63 | 11 |
| 18 | 1 | 3 | 23 | 63 | 10 |
| 19 | 1 | 3 | 24 | 63 | 9 |
| 20 | 1 | 3 | 25 | 62 | 9 |
| 21 | 1 | 3 | 26 | 62 | 8 |
| 22 | 1 | 3 | 27 | 61 | 8 |
| 23 | 1 | 3 | 28 | 61 | 7 |
| 24 | 1 | 3 | 29 | 60 | 7 |
| 25 | 1 | 3 | 30 | 60 | 6 |
| 26 | 1 | 3 | 30 | 60 | 6 |
| 27 | 1 | 3 | 30 | 60 | 6 |
| 28 | 1 | 3 | 30 | 61 | 5 |
| 29 | 1 | 3 | 30 | 61 | 5 |
| 30 | 1 | 2 | 30 | 62 | 5 |
| 31 | 0 | 2 | 30 | 63 | 5 |
Wind in December
Winds average 9 km/h in December.
Across December, daily wind ranges from about 9 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) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 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 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | 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 6:03 AM to 6:18 AM, and sunset from 5:32 PM to 5:44 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 | 11.5 | 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 |
| Sunrise (AM) | 6:03 | 6:04 | 6:04 | 6:05 | 6:05 | 6:06 | 6:06 | 6:07 | 6:07 | 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 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 |
| Sunset (PM) | 5:32 | 5:32 | 5:32 | 5:33 | 5:33 | 5:33 | 5:34 | 5:34 | 5:34 | 5:35 | 5:35 | 5:35 | 5:36 | 5:36 | 5:37 | 5:37 | 5:37 | 5:38 | 5:38 | 5:39 | 5:39 | 5:40 | 5:40 | 5:41 | 5:41 | 5:42 | 5:42 | 5:43 | 5:43 | 5:44 | 5:44 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.5 | 6:03 | 5:32 |
| 2 | 11.5 | 6:04 | 5:32 |
| 3 | 11.5 | 6:04 | 5:32 |
| 4 | 11.5 | 6:05 | 5:33 |
| 5 | 11.5 | 6:05 | 5:33 |
| 6 | 11.5 | 6:06 | 5:33 |
| 7 | 11.5 | 6:06 | 5:34 |
| 8 | 11.5 | 6:07 | 5:34 |
| 9 | 11.5 | 6:07 | 5:34 |
| 10 | 11.4 | 6:08 | 5:35 |
| 11 | 11.4 | 6:08 | 5:35 |
| 12 | 11.4 | 6:09 | 5:35 |
| 13 | 11.4 | 6:09 | 5:36 |
| 14 | 11.4 | 6:10 | 5:36 |
| 15 | 11.4 | 6:10 | 5:37 |
| 16 | 11.4 | 6:11 | 5:37 |
| 17 | 11.4 | 6:11 | 5:37 |
| 18 | 11.4 | 6:12 | 5:38 |
| 19 | 11.4 | 6:12 | 5:38 |
| 20 | 11.4 | 6:13 | 5:39 |
| 21 | 11.4 | 6:13 | 5:39 |
| 22 | 11.4 | 6:14 | 5:40 |
| 23 | 11.4 | 6:14 | 5:40 |
| 24 | 11.4 | 6:15 | 5:41 |
| 25 | 11.4 | 6:15 | 5:41 |
| 26 | 11.4 | 6:15 | 5:42 |
| 27 | 11.4 | 6:16 | 5:42 |
| 28 | 11.4 | 6:16 | 5:43 |
| 29 | 11.4 | 6:17 | 5:43 |
| 30 | 11.4 | 6:17 | 5:44 |
| 31 | 11.4 | 6:18 | 5:44 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 4.4 kWh/m².
For context, solar energy here swings from a low near 4.11 kWh/m² to a high of 5.94 kWh/m² in March across the year — December's 4.4 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) | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 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 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| 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 | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.3 | Bright |
| 2 | 4.3 | Bright |
| 3 | 4.3 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.4 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.4 | Bright |
| 19 | 4.4 | Bright |
| 20 | 4.4 | Bright |
| 21 | 4.4 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.5 | Bright |
| 24 | 4.5 | Bright |
| 25 | 4.5 | Bright |
| 26 | 4.5 | Bright |
| 27 | 4.5 | Bright |
| 28 | 4.5 | Bright |
| 29 | 4.5 | Bright |
| 30 | 4.5 | Bright |
| 31 | 4.5 | Bright |
Hazard calendar for Long Mỹ
In December, Long Mỹ sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Long Mỹ sits in the Pacific typhoon belt; the season peaks July–October.
Long Mỹ's rainy season runs May–November, when most of the year's rain falls.
Is December a good time to visit Long Mỹ?
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 Long Mỹ for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Long Mỹ in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Long Mỹ sees daytime highs around 30°C and nights near 23°C. Pack light clothes. Worth having: rain gear. About 10 days see rain.
Sea temperature near Long Mỹ in December
The nearest coast averages about 27°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 62 km away) is warmest in May at about 30°C and coldest in January near 26°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) | 26 | 26 | 28 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 28 | Warm |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in Long Mỹ 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 Long Mỹ peaks around March 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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) | 10 | 12 | 13 | 13 | 13 | 12 | 12 | 13 | 13 | 10 | 10 | 10 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 13 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Extreme |
| Nov | 10 | Very high |
| Dec | 10 | Very high |
Air quality in Long Mỹ 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 Long Mỹ is worst in December — around 57 µg/m³ PM2.5 (unhealthy), about 2.1× the cleanest month (August, 27 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) | 51 | 40 | 38 | 39 | 37 | 32 | 30 | 27 | 35 | 49 | 53 | 57 |
| Level | Poor | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Poor | Poor | Poor | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 51 | Poor |
| Feb | 40 | Poor |
| Mar | 38 | Poor |
| Apr | 39 | Poor |
| May | 37 | Poor |
| Jun | 32 | Moderate |
| Jul | 30 | Moderate |
| Aug | 27 | Moderate |
| Sep | 35 | Poor |
| Oct | 49 | Poor |
| Nov | 53 | Poor |
| Dec | 57 | Unhealthy |
Where is Long Mỹ?
Long Mỹ sits at 9.7°N, 105.6°E, 2 m above sea level, in Vietnam. The nearest listed city is Ngã Năm, 13 km away.
Topography around Long Mỹ
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Long Mỹ.
Within 3 km, the terrain around Long Mỹ has only modest variations in elevation — a maximum elevation change of 11 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 18 m; within 80 km, only modest variations in elevation — a maximum elevation change of 206 m.
The land around Long Mỹ is covered by cropland (66%) and trees (22%) within 3 km, cropland (74%) and trees (21%) within 16 km, and cropland (50%), water (25%) and trees (21%) 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 Long Mỹ (9.6814°, 105.5723°, elevation 2 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). 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).