# Chai Badan district

Chai Badan (Thai: ชัยบาดาล, pronounced) is a district (amphoe) in the eastern part of Lopburi province, central Thailand. The local people usually call it Lam Narai, as the district center is in Tambon Lam Narai.

## History

Chai Badan was an ancient town in the Pa Sak River valley, controlled from Nakhon Ratchasima. In 1914 it was upgraded to be a district of Phetchabun province. In 1918 it was moved to be part of Saraburi province. Finally it became part of Lopburi province on 1 November 1941.
In 1943 the district office was moved from Chai Badan Sub-district to Bua Chum Sub-district, which was undone one year later. In 1960 it was again moved to Bua Chum. The area around the district office was made the new Sub-district Lam Narai in 1970.

## Geography

Neighbouring districts are (from the east clockwise) Lam Sonthi, Tha Luang, Phatthana Nikhom, Khok Samrong and Khok Charoen of Lopburi Province, and Si Thep of Phetchabun province.
The Wang Kan Luang waterfall is the most visited place by Lopburi visitors.
The district is the site of a Royal Thai Air Force gunnery range.

## Administration

The district is divided into 17 sub-districts (tambons), which are further subdivided into 136 villages (mubans). Lam Narai has sub-district municipality status (thesaban tambon) and covers part of the tambon Lam Narai and Chai Narai. There are a further 16 tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Pop. |
| 01. | Lam Narai | ลำนารายณ์ | 12 | 17,488 |
| 02. | Chai Narai | ชัยนารายณ์ | 06 | 06,294 |
| 03. | Sila Thip | ศิลาทิพย์ | 12 | 05,635 |
| 04. | Huai Hin | ห้วยหิน | 08 | 02,741 |
| 05. | Muang Khom | ม่วงค่อม | 11 | 05,650 |
| 06. | Bua Chum | บัวชุม | 09 | 08,071 |
| 07. | Tha Din Dam | ท่าดินดำ | 06 | 04,509 |
| 08. | Makok Wan | มะกอกหวาน | 03 | 01,504 |
| 09. | Sap Takhian | ซับตะเคียน | 06 | 04,896 |
| 10. | Na Som | นาโสม | 06 | 02,655 |
| 11. | Nong Yai To | หนองยายโต๊ะ | 08 | 04,000 |
| 12. | Ko Rang | เกาะรัง | 10 | 06,510 |
| 14. | Tha Manao | ท่ามะนาว | 08 | 03,224 |
| 17. | Nikhom Lam Narai | นิคมลำนารายณ์ | 09 | 04,423 |
| 18. | Chai Badan | ชัยบาดาล | 08 | 06,334 |
| 19. | Ban Mai Samakkhi | บ้านใหม่สามัคคี | 06 | 02,957 |
| 22. | Khao Laem | เขาแหลม | 08 | 03,333 |
The missing numbers belong to tambon which now form Lam Sonthi District

## Climate

Climate data for Chai Badan (Bua Chum) (1991–2020) :
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 38.0 (100.4) | 40.7 (105.3) | 42.4 (108.3) | 42.7 (108.9) | 41.8 (107.2) | 40.9 (105.6) | 39.1 (102.4) | 37.5 (99.5) | 36.3 (97.3) | 35.8 (96.4) | 37.4 (99.3) | 36.5 (97.7) | 42.7 (108.9) |
| Mean daily maximum °C (°F) | 32.5 (90.5) | 35.0 (95.0) | 36.9 (98.4) | 37.6 (99.7) | 36.1 (97.0) | 35.0 (95.0) | 34.1 (93.4) | 33.5 (92.3) | 32.9 (91.2) | 32.6 (90.7) | 32.3 (90.1) | 31.5 (88.7) | 34.2 (93.5) |
| Daily mean °C (°F) | 25.0 (77.0) | 27.4 (81.3) | 29.6 (85.3) | 30.4 (86.7) | 29.6 (85.3) | 29.2 (84.6) | 28.6 (83.5) | 28.1 (82.6) | 27.7 (81.9) | 27.4 (81.3) | 26.1 (79.0) | 24.6 (76.3) | 27.8 (82.1) |
| Mean daily minimum °C (°F) | 18.6 (65.5) | 20.7 (69.3) | 23.3 (73.9) | 24.8 (76.6) | 25.0 (77.0) | 24.8 (76.6) | 24.4 (75.9) | 24.2 (75.6) | 24.1 (75.4) | 23.3 (73.9) | 20.9 (69.6) | 18.6 (65.5) | 22.7 (72.9) |
| Record low °C (°F) | 8.4 (47.1) | 11.6 (52.9) | 12.7 (54.9) | 19.5 (67.1) | 20.9 (69.6) | 21.6 (70.9) | 21.0 (69.8) | 21.4 (70.5) | 20.7 (69.3) | 14.1 (57.4) | 9.7 (49.5) | 5.7 (42.3) | 5.7 (42.3) |
| Average precipitation mm (inches) | 11.3 (0.44) | 8.6 (0.34) | 41.7 (1.64) | 78.4 (3.09) | 136.1 (5.36) | 124.0 (4.88) | 121.2 (4.77) | 184.4 (7.26) | 246.0 (9.69) | 131.7 (5.19) | 15.6 (0.61) | 6.0 (0.24) | 1,105 (43.50) |
| Average precipitation days (≥ 1.0 mm) | 0.8 | 1.2 | 3.4 | 6.1 | 10.7 | 9.0 | 10.6 | 13.1 | 14.3 | 8.6 | 1.6 | 0.6 | 80.0 |
| Average relative humidity (%) | 65.9 | 62.9 | 64.2 | 68.1 | 76.0 | 77.3 | 79.0 | 82.0 | 84.8 | 81.1 | 73.7 | 67.7 | 73.6 |
| Source: World Meteorological Organization(extremes) ||||||||||||||