# Thung Chang district

Thung Chang (Thai: ทุ่งช้าง, pronounced; Northern Thai: โต้งจ๊าง, pronounced) is a district (amphoe) in the northern part of Nan province, northern Thailand.

## History

Thung Chang District dates back to the Khwaeng Khun Nan (ขุนน่าน), which was converted into the district Lae (และ) in 1914. In 1961 it was renamed Thung Chang, as the district office had been moved to tambon Thung Chang.

## Geography

Neighboring districts are, from the east clockwise, Chaloem Phra Kiat, Pua, Chiang Klang and Song Khwae of Nan Province. To the north is Xaignabouli of Laos.
The eastern part of the district is in the Luang Prabang Range of the Thai highlands.

## Climate

Climate data for Thung Chang (1981–2010, extremes 1997-present) :
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 35.8 (96.4) | 36.5 (97.7) | 39.2 (102.6) | 41.6 (106.9) | 41.5 (106.7) | 37.5 (99.5) | 36.8 (98.2) | 36.5 (97.7) | 35.0 (95.0) | 35.0 (95.0) | 34.4 (93.9) | 33.5 (92.3) | 41.6 (106.9) |
| Mean daily maximum °C (°F) | 29.7 (85.5) | 32.0 (89.6) | 34.1 (93.4) | 34.9 (94.8) | 32.8 (91.0) | 31.8 (89.2) | 30.7 (87.3) | 30.6 (87.1) | 31.2 (88.2) | 31.3 (88.3) | 30.2 (86.4) | 28.8 (83.8) | 31.5 (88.7) |
| Daily mean °C (°F) | 20.4 (68.7) | 22.1 (71.8) | 24.8 (76.6) | 27.2 (81.0) | 27.0 (80.6) | 27.1 (80.8) | 26.5 (79.7) | 26.3 (79.3) | 26.0 (78.8) | 25.3 (77.5) | 22.5 (72.5) | 20.4 (68.7) | 24.6 (76.3) |
| Mean daily minimum °C (°F) | 13.5 (56.3) | 14.7 (58.5) | 17.4 (63.3) | 21.2 (70.2) | 22.9 (73.2) | 23.8 (74.8) | 23.6 (74.5) | 23.5 (74.3) | 22.8 (73.0) | 21.1 (70.0) | 17.1 (62.8) | 14.4 (57.9) | 19.7 (67.5) |
| Record low °C (°F) | 7.0 (44.6) | 6.4 (43.5) | 10.5 (50.9) | 14.2 (57.6) | 18.0 (64.4) | 21.0 (69.8) | 20.0 (68.0) | 21.4 (70.5) | 17.5 (63.5) | 13.6 (56.5) | 9.3 (48.7) | 2.6 (36.7) | 2.6 (36.7) |
| Average rainfall mm (inches) | 22.5 (0.89) | 15.3 (0.60) | 46.2 (1.82) | 120.5 (4.74) | 220.1 (8.67) | 216.2 (8.51) | 328.2 (12.92) | 386.7 (15.22) | 270.0 (10.63) | 90.5 (3.56) | 20.5 (0.81) | 13.4 (0.53) | 1,750.1 (68.90) |
| Average rainy days | 2.0 | 1.5 | 4.3 | 10.0 | 18.0 | 17.8 | 21.7 | 24.5 | 18.4 | 10.7 | 3.2 | 1.2 | 133.3 |
| Average relative humidity (%) | 78.7 | 74.0 | 71.0 | 74.7 | 82.2 | 85.0 | 87.3 | 88.8 | 87.4 | 84.5 | 80.0 | 78.8 | 81.0 |
| Mean monthly sunshine hours | 322.4 | 305.1 | 350.3 | 279.0 | 220.1 | 198.0 | 161.2 | 117.8 | 183.0 | 269.7 | 264.0 | 285.2 | 2,955.8 |
| Source 1: Thai Meteorological Department ||||||||||||||
| Source 2: Office of Water Management and Hydrology, Royal Irrigation Department (sun) ||||||||||||||

## Administration
### Central administration

Thung Chang is divided into four sub-districts (tambons), which are further subdivided into 40 administrative villages (mubans).
| No. | Name | Thai | Villages | Pop. |
| 01. | Pon | ปอน | 08 | 2,761 |
| 02. | Ngop | งอบ | 11 | 5,551 |
| 03. | Lae | และ | 14 | 4,642 |
| 04. | Thung Chang | ทุ่งช้าง | 07 | 5,421 |

### Local administration

There are two sub-district municipalities (thesaban tambons) in the district:
* Ngop (Thai: เทศบาลตำบลงอบ) consisting of sub-district Ngop.
* Thung Chang (Thai: เทศบาลตำบลทุ่งช้าง) consisting of parts of sub-districts Lae and Thung Chang.
There are three sub-district administrative organizations (SAO) in the district:
* Pon (Thai: องค์การบริหารส่วนตำบลปอน) consisting of sub-district Pon.
* Lae (Thai: องค์การบริหารส่วนตำบลและ) consisting of parts of sub-district Lae.
* Thung Chang (Thai: องค์การบริหารส่วนตำบลทุ่งช้าง) consisting of parts of sub-district Thung Chang.