Always hot.
1, You can stay out late comfortably. I live in Spain, warm months mean terraces, drinks, concerts, late night sports good ol' timey fun.
2, I really don't like wearing many layers of clothes. Especially not socks, underwear, jackets, sweaters or whatnot.
3, Girls don't overdress either.
4, Pools, beaches, lakes etc. WATER.
As long as you stay hydrated and don't decide to spend too much time in the sun if you are one of them pale northerners who toasts in seconds (like I am), heat won't harm you, you can always do refreshing things.
Cold equals: flu seasons, too much clothes, impossibility of keeping your car clean, uncomfortable staying out too long, no outdoors events, no parades, concerts or open air cinemas etc.
People always complain about the weather no matter what. But this is why heat is better:
-OMFG it's so hot today, I can't stand this shit! So later on we are going to the pool/having some cold Mojitos on a terrace in the shade/we 'll go to the beach for the weekend.
-OMFG it's so cold and rainy/snowy today! This is unbearable. I'll just stay inside.