How to know if a basement is dry enough to finish
It's not clear what you're asking exactly, but the bigger question is probably whether you'll be able to manage moisture once the basement is finished. If you can run a dehumidifier during the summer months and prevent extreme humidity, and if all drainage issues are handled, you should be fine. 

Be cognizant of the right way to install vapor barriers and other moisture-handling mechanisms in your area. The best approach depends on a number of factors, such as climate, soil conditions, foundation type, etc. Speaking with local builders and inspectors would be wise.