Weather Averages for Sydney in December
| Average Temperature | 72°f (22°c) |
| Average Low Temperature | 64°f (18°c) |
| Average High Temperature | 79°f (26°c) |
| Average Sea Temperature | N/A (22°c) |
| Average Precipitation | 85mm |
| Average Rainfall Days | 11 Days |
| Average Daily Sunshine Hours | 8 Hrs |
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