How can I tell in each month, when here will be no moon shining or seen at night?
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4$\begingroup$ Have you made any attempt to answer this yourself? For example, did you try searching on the web? $\endgroup$ – James K Mar 29 '18 at 5:54
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1$\begingroup$ Depending on how you define 'night', the nights just before and after a new moon are also moonless, because the moon is either too close to the sun to be seen, or sets before twilight ends, or rises after twilight begins. $\endgroup$ – user21 Mar 29 '18 at 13:52
A new moon (when the moon is not seen at night) happens regularly, every 29.5 days (roughly). This is roughly one day less than a month. So you can forecast the next few new moons by "add a month, minus a day"
The next New moon will be on 16 April. We would then expect new moons on: 15 May, 14 June, 13 July, 12 August and so on.
A website like timeanddate.com will do the accurate calculations for you (adjusting for your local time and so on.