A few thoughts:
Think of fragrances like flavor for your nose. You expect more out of food than nutrition, right? Flavor matters a lot! Ever notice how different foods taste better at different times of the year? Or different drinks? I love lemonade in the summer, but I never touch the stuff in winter. If you're a beer connoisseur, you probably drink more porters and stouts in the winter than in the summer.
In the same way that some tastes are harder to enjoy in the summer, some fragrances are too, and I'm not just talking about perfume. I made a crock pot chicken dish for a friend last winter and my place smelled fantastic! She asked me to make it again a few weeks ago. It was a hot spring day and, even with the windows open, the smell of it cooking all afternoon felt almost suffocating.
I couldn't wear DHI as a signature scent. It's too heavy for summer and too rich for every day. It's an excellent scent, but I don't find it to be particularly versatile.
70 degrees seems to be the cutoff where I put away the darker stuff and reach for the refreshing stuff.