I don't understand. The situation is that the month is July (we are in July.) and let the set the scenario, say that, on July 20, 200_, you are asking which month I am in, you should ask "What month is this?", not the way like you have on (in????) your post.
Caveat: I must admit to the public out there in this forum that personally, I almost never saw anyone using "What month is this?" Almost always, the question is phrased as," What month is it?" or "Which month are we in?"
Should it be in or on?