The rains should have arrived, and the game will be moving east to browse in the Namutoni area and further north, beyond the road network. The central waterholes quieten down and will no longer be visited much by elephant; rhino, too, may take some seeking out.
Baby animals are born and shiver into action, able to walk in no time, but vulnerable for the first few days after birth. Visitor numbers soar in mid to late December as local holidays kick in. Book way in advance if you hope to travel at this time, for all accommodations inside and outside the park. Large family parties will be setting up camp in the park with everything including a kitchen sink and buzzing about in search of predators; if the crowds will intrude on the experience, choose another time. Average temperatures have cooled a bit with rains, but still average 35°. Intra-African and Palearctic migrant bird species should be here, an enormous plus for birders.