Landing requires 75m visibility but take off's require about 125m and you would be surprised by how long visibility hovers around 75m. The older runway has better visibility than the newer one. There are 2-3 days when nothin moves in the airport till late morning but otherwise operations continue although with a little bit of delay.

And a later flight during the day may not always be on time as that same aircraft generally does a morning turn and then only the next one.