I know there should be big difference between various countries.
A developer with two years of experience in China may earn 15,000 a month(21.75 days), or 86 RMB (~12.5 USD) an hour (8 hours a day).
Developers are getting screwed in China. Non-blockchain developers in the US are getting paid around 65,000 Yuan a MONTH. This equals roughly $10,000 a month ($120,000 per year). Especially developers in silicon valley.