Map including Kailu (labeled as K'ai-lu (walled) 開魯) (AMS, 1955)
As the traditional seat of Ar Khorchin, East Jaruud and West Jaruud, the 3 areas are abbreviated in Chinese as the 3 R's since each contains the word R transcribed as "LU" in Chinese. The 3 R's was then known as the 3 Lu's as well. In 1905, with the slogan of developing the 3 R's (開發三魯), the city took the name of such abbreviation and was named 開魯 (KAI LU).
Kailu County features a cold semi-arid climate (KöppenBSk), marked by long, very cold and dry winters, hot, somewhat humid summers, and strong winds, especially in spring. The monthly daily mean temperature in January, the coldest month, is −13.0°C (8.6°F), and in July, the warmest month, 24.2°C (75.6°F), with the annual mean at 7.0°C (44.6°F). The annual precipitation is 327.4 millimetres (12.9in), with nearly half of it falling in July and August alone.
Climate data for Kailu, elevation 241m (791ft), (1991–2020 normals, extremes 1971–2010)
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