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Climate — Wamena: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 21°C | 6°C | 222 mm |
| February | 20°C | 7°C | 214 mm |
| March | 20°C | 6°C | 257 mm |
| April | 21°C | 7°C | 246 mm |
| May | 20°C | 7°C | 181 mm |
| June | 19°C | 5°C | 186 mm |
| July | 20°C | 6°C | 188 mm |
| August | 20°C | 6°C | 169 mm |
| September | 20°C | 4°C | 193 mm |
| October | 21°C | 3°C | 183 mm |
| November | 20°C | 7°C | 192 mm |
| December | 21°C | 5°C | 215 mm |
Long-term model averages for an area of about 50 km — not a forecast; mountains are often cooler. Source: NASA POWER Project (CC BY 4.0) (2001–2025)