# Yên Bái

Yên Bái (listen) is a city in Vietnam. It is the capital of Yên Bái Province, in the north-east region of Vietnam. The city borders Yên Bình District and Trấn Yên District. The city is a settlement along the banks of the Red River, approximately 183 km northwest of Hanoi. It is one of the important trading hubs between the highlands and the lowlands of Northern Vietnam.

## History

At the end of the sixteenth century Yên Bái was a small village in Bach Lam district, Quy Hoa district, Hung Hoa province. On April 11, 1900, Yen Bai province was established by the French colonialist government. The city grew in size with the opening of the Hanoi–Lào Cai railway, which attracted many migrants.
On February 10, 1930, part of the 4th Regiment of Tonkinese Rifles stationed at Yen Bai mutinied against their French officers in the Yên Bái mutiny. They were suppressed by loyal troops from the same unit. This incident led to widespread disturbances against French rule across northeastern Vietnam during 1930–31.

## Demographics

As of 2019, the city had a population of 100,631, covering an area of 108.15 km$^2$.

## Administrative divisions

Yên Bái administers 9 wards and 6 rural communes:
* Đồng Tâm
* Hồng Hà
* Hợp Minh
* Minh Tân
* Nam Cường
* Nguyễn Phúc
* Nguyễn Thái Học
* Yên Ninh
* Yên Thịnh
Rural communes:
* Âu Lâu
* Giới Phiên
* Minh Bảo
* Tân Thịnh
* Tuy Lộc
* Văn Phú

## Climate

Climate data for Yên Bái :
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 30.4 (86.7) | 34.8 (94.6) | 35.5 (95.9) | 37.9 (100.2) | 40.0 (104.0) | 40.4 (104.7) | 39.8 (103.6) | 39.6 (103.3) | 37.8 (100.0) | 37.2 (99.0) | 34.0 (93.2) | 30.8 (87.4) | 40.4 (104.7) |
| Mean daily maximum °C (°F) | 19.2 (66.6) | 20.3 (68.5) | 23.2 (73.8) | 27.2 (81.0) | 31.3 (88.3) | 32.7 (90.9) | 32.6 (90.7) | 32.5 (90.5) | 31.5 (88.7) | 28.8 (83.8) | 25.3 (77.5) | 21.6 (70.9) | 27.2 (81.0) |
| Daily mean °C (°F) | 15.8 (60.4) | 17.1 (62.8) | 19.9 (67.8) | 23.6 (74.5) | 26.8 (80.2) | 28.2 (82.8) | 28.2 (82.8) | 27.8 (82.0) | 26.7 (80.1) | 24.3 (75.7) | 20.8 (69.4) | 17.3 (63.1) | 23.0 (73.4) |
| Mean daily minimum °C (°F) | 13.6 (56.5) | 15.1 (59.2) | 17.9 (64.2) | 21.3 (70.3) | 23.8 (74.8) | 25.2 (77.4) | 25.3 (77.5) | 24.9 (76.8) | 23.8 (74.8) | 21.5 (70.7) | 18.0 (64.4) | 14.6 (58.3) | 20.4 (68.7) |
| Record low °C (°F) | 3.3 (37.9) | 5.1 (41.2) | 6.8 (44.2) | 11.0 (51.8) | 16.8 (62.2) | 18.6 (65.5) | 19.5 (67.1) | 18.3 (64.9) | 16.9 (62.4) | 11.3 (52.3) | 6.8 (44.2) | 2.9 (37.2) | 2.9 (37.2) |
| Average rainfall mm (inches) | 36.3 (1.43) | 40.8 (1.61) | 72.6 (2.86) | 123.1 (4.85) | 222.9 (8.78) | 262.4 (10.33) | 309.0 (12.17) | 364.2 (14.34) | 272.9 (10.74) | 163.6 (6.44) | 62.8 (2.47) | 29.9 (1.18) | 1,960.6 (77.19) |
| Average rainy days | 14.4 | 16.4 | 20.7 | 20.3 | 16.5 | 16.3 | 18.5 | 18.2 | 14.2 | 11.6 | 9.1 | 9.3 | 185.9 |
| Average relative humidity (%) | 87.2 | 88.0 | 88.5 | 87.9 | 84.3 | 84.6 | 85.6 | 86.2 | 85.6 | 85.2 | 85.0 | 84.8 | 86.1 |
| Mean monthly sunshine hours | 51.7 | 40.3 | 43.0 | 73.7 | 147.1 | 149.5 | 163.5 | 174.5 | 169.5 | 140.0 | 119.3 | 97.3 | 1,363.9 |
| Source: Vietnam Institute for Building Science and Technology ||||||||||||||