The river flows in the southeast area of Sulawesi with predominantly tropical monsoon climate (designated as Am in the Köppen-Geiger climate classification).[3] The annual average temperature in the area is 23 °C. The warmest month is October, when the average temperature is around 26 °C, and the coldest is June, at 24 °C.[4] The average annual rainfall is 2500 mm. The wettest month is May, with an average of 387 mm rainfall, and the driest is September, with 68 mm rainfall.[5]
| Mamasa River
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| Climate chart (explanation) |
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J |
F |
M |
A |
M |
J |
J |
A |
S |
O |
N |
D |
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| █ Average max. and min. temperatures in °C |
| █ Precipitation totals in mm | | Source: [4] |
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| Imperial conversion |
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| J | F | M | A | M | J | J | A | S | O | N | D |
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| █ Average max. and min. temperatures in °F |
| █ Precipitation totals in inches |
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