Nyerere National Park spans an area of about 30,893 square kilometers ( over twice the size of the Serengeti! ). The park is part of a much larger eco system which includes the bordering Selous Game Reserve, located in Southern Tanzania.
The average temperatures in Nyerere National park vary very little. Considering humidity, temperatures feel hot for most of the year with a low chance of precipitation most of the year. The warmest time of year is generally mid to late November where highs are regularly around 92°F (33.3°C) with temperatures rarely dropping below 70.5°F (21.4°C) at night. The Park experiences bimodal rainfall season and the short rains fall in November and December and are followed by a partial drying out in January and February. Thereafter, the long rains follow ending in early May. The Park's panoramic plains are decorated with golden grass, savannah forests, riverine marshes and lakes. Rufiji River, the biggest river in Tanzania, cuts through the park and flows into the Indian Ocean.
Some basic geographical facts are as below:
Altitude: 100–400 m;
Rainfall: 85 mm (3.4 inches) per month;
Temperature range: 21.4–33.3 °C (70.5–92 °F).