Back to the original topic,
May was a great month to be trading equites(that's all I trade, so am not sure about other investments). Volatility picked up which made for great months for many traders in my group as well as others I have spoken too. I personally had my best month of my six year career.
However, trading isn't always about just volatility, it is also about what is in your head. If you are not all there mentally, it doesn't matter how good the market may have been, you may not fully profit from it. Also, even if you are all there, if you can't find what is in play that will also effect your performance.
It helps to be trading with a good group of people( a team) you can trust since you can't always find everything yourself.