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Weather & Climate in Viangxai, Laos
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Viangxai enjoys a temperate climate with an average annual temperature of 68°F (20°C). Winters average 52°F in January while summers reach 75°F in July. The area gets 308 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 51.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 2,894 feet.
Temperature
52°F Jan (11°C)
75°F Jul (24°C)
| Annual Average | 68.3°F |
| 26% above US avg | |
| January Average | 52°F (11°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 308 days/yr |
Geography
| Elevation | 2,894 ft (882 m) |
| Area | 1,611.9 sq mi (4,174.7 km²) |
| Population Density | 0/sq mi |
| Coordinates | 20.4068°N, 104.2238°W |
| Timezone | Asia/Vientiane |
Precipitation & Snow
Air Quality
Earthquake History
15 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.
| Jul 27, 2020 | ~120km W of Hanoi, Vietnam | M4.9 | 66 km | 10 km |
| Apr 3, 2003 | 83 km S of Dien Bien Phu, Vietnam | M4.7 | 113 km | 10 km |
| Jul 19, 2014 | 19 km NNE of S?n La, Vietnam | M4.6 | 123 km | 17 km |
| May 2, 2007 | 73 km S of Dien Bien Phu, Vietnam | M4.5 | 119 km | 10 km |
| May 26, 2015 | 73 km ESE of Muang Phônsavan, Laos | M4.5 | 142 km | 13 km |
| Oct 6, 1991 | 33 km E of S?n La, Vietnam | M4.5 | 109 km | 10 km |
| Jun 21, 1995 | 83 km W of Xam Nua, Laos | M4.4 | 102 km | 33 km |
| Mar 14, 2022 | 76 km SSE of Dien Bien Phu, Vietnam | M4.4 | 100 km | 10 km |
| Jan 7, 2018 | 36 km E of Dien Bien Phu, Vietnam | M4.3 | 139 km | 10 km |
| Jan 8, 2018 | 36 km E of Dien Bien Phu, Vietnam | M4.3 | 139 km | 10 km |
| Jun 21, 1995 | 72 km N of Muang Phônsavan, Laos | M4.2 | 108 km | 10 km |
| Mar 25, 2024 | 27 km S of Xuân Mai, Vietnam | M4.2 | 141 km | 10 km |
| May 7, 2011 | 46 km SSW of S?n La, Vietnam | M4.1 | 84 km | 10 km |
| Oct 23, 1993 | 20 km SSW of Yên Bái, Vietnam | M4.1 | 143 km | 33 km |
| Sep 19, 2010 | 71 km SSW of Hòa Bình, Vietnam | M4.0 | 87 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
13 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2025 | Kajiki | Category 2 | — | 254 km |
| 2024 | Yagi | Category 3 | 104 mph | 167 km |
| 2016 | Mirinae | Category 1 | 52 mph | 207 km |
| 2014 | Kalmaegi | Category 1 | 63 mph | 277 km |
| 2013 | Wutip | Category 1 | 69 mph | 288 km |
| 2012 | Son-tinh | Category 2 | 81 mph | 248 km |
| 1997 | Zita | Category 1 | 46 mph | 214 km |
| 1996 | Frankie | Category 2 | 52 mph | 175 km |
| 1996 | Niki | Category 1 | 69 mph | 151 km |
| 1995 | Lois | Category 1 | 58 mph | 189 km |
| 1989 | Brian | Category 1 | 58 mph | 290 km |
| 1982 | Nancy | Category 1 | 81 mph | 213 km |
| 1980 | Ruth | Category 1 | 63 mph | 265 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 52°F (11°C) | 0.4 in | Coldest, Driest |
| February | 61°F (16°C) | 1.5 in | |
| March | 66°F (19°C) | 1.4 in | |
| April | 72°F (22°C) | 4.1 in | |
| May | 75°F (24°C) | 7.3 in | |
| June | 77°F (25°C) | 8.2 in | Warmest |
| July | 75°F (24°C) | 12.6 in | Wettest |
| August | 76°F (24°C) | 11.6 in | |
| September | 74°F (23°C) | 8.3 in | |
| October | 71°F (21°C) | 3.2 in | |
| November | 65°F (18°C) | 1.1 in | |
| December | 60°F (15°C) | 0.5 in |
Viangxai has a seasonal temperature swing of 25°F / from 52°F in January to 77°F in June. Total annual precipitation is 60.2 inches, with July being the wettest month (12.6") and January the driest (0.4").