Hi Shefali,
Munisyari will be full of snow right now. If you are interested in seeing snow-clad Himalayas, you could plan your trip in this season. However, for tourists interested in sightseeing and trekking, the best time to visit Munsiyari is spring (March to June) and autumn (mid-September to October).
Attaching below a few authentic experiences of travellers who have been there to help you plan your trip.
Hope this helps!