The average salary for a chinese citizen in Wuhan is 1.700rmb/month. The Average salary for a chinese citizen in China as a whole is 3.000rmb/month. Official numbers. For a chinese, 3000rmb in Wuhan is probably decent living by chinese standards, not western.. There is a big difference. In Wuhan you can get a fully furnished apartment with all commodities, western style for around 1.500rmb/month. Chinese standards you can get away with 6-800/month. Gas, Electricity and water is very cheap here. You can rent an apartment for as low as 500rmb/month but most westerners would think the standard is far below their criteria. I would say it depends a lot about how much you are willing to adapt and cast your western lifestyle aside.
Here in Beijing, i know people who work fulltime (all kinds of positions) for as low as 1.500rmb/month. I have also met a few that cash in believe it or not 100 - 150.000/month, both chinese and foreigners. Its a whole different world here. You can have a decent living on 3000rmb/month even in Beijing, if u can consider and adapt to chinese lower middle class standards. You just have to learn how and where to buy your stuff and how not to get constantly ripped off. Having a chinese girl by your side will help a lot.
It is not difficult to survive decently in China with very small means of financial aid, but this is up to yourself and your personal(ity) and habits.