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Yes, instrumental is used when you want to say "In [part of the day]":
утром - in the morning
вечером - in the evening
We don't say "в утро", "в вечер" etc (though "в это утро", "в этот вечер" are...

These are planes flying to the south again.

In the grey evenings the winds become furious.

But the winds will blow and lick the snowdrifts.

This is a pleasure of spring and presentiment of...