Who am i Riddles

I add 5 to 9 and get 2. The answer is correct, so what am I?

You see me once in June, twice in November, and not at all in May. What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Take one out and scratch my head, I am now black but once was red. What am I?

If your uncle’s sister is not your aunt, what relation is she to you?

No matter how little or how much you use me, you change me every month. What am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?