It's a great choice for a summer night, although I actually tend to wear it more it cooler weather. D&G PH is actually quite versatile. However, I would avoid it on the hottest or most humid days or in any situation where you'll be sweating (dancing, etc.) because it's richness can become choking very easily. Use a light trigger finger with this one - it is rather potent IMO.
Back when I owned D&G PH I loved wearing it during the summer nights but couldn't wait to wear it in the fall/winter. Then when it got to be fall/winter, I realized that I liked wearing it duirng the summer more! It's a great one for warmer weather, surprisingly enough.
I agree with the little goes a long way comment. On me it would become intense in the summer. In fact I've pretty much given up on this one. My wife loves it but I can't get past the tobacco. Anyone interested can visit my swap list.
I have come around on D&G PH! I am now a believer. Earlier today, I took a quick dart into the local department store and smelled various scents on offer. D&G PH was one of those that simply blew me away. Excellent, definitely a four or five star perfume!