December Weather Averages for Sydney
| High Temp | 25°C | 77°F |
| Low Temp | 18°C | 65°F |
| Avg Temp | 21°C | 70°F |
| Sunshine Hours | 67 hours | |
| Rainfall | 26.27 mm | 1.03 In |
| Rain days | 5 days | |
| Pressure | 1013 mb | 30 In |
Sydney December Averages Year by Year
| Year | High Temp | Low Temp | Avg Temp | Sunshine Hours | Rainfall | Rain days | Pressure |
| 2009 | 25°C / 77°F | 19°C / 66°F | 22°C / 71°F | 71 hours | 28.81 mm / 1.13 In | 4 days | 1015 mb / 30 In |
| 2010 | 25°C / 77°F | 18°C / 65°F | 21°C / 70°F | 76 hours | 26.04 mm / 1.03 In | 5 days | 1011 mb / 30 In |
| 2011 | 22°C / 71°F | 16°C / 61°F | 19°C / 66°F | 57 hours | 28.81 mm / 1.13 In | 3 days | 1015 mb / 30 In |
| 2012 | 25°C / 77°F | 18°C / 64°F | 21°C / 70°F | 65 hours | 8.15 mm / 0.32 In | 3 days | 1014 mb / 30 In |
| 2013 | 26°C / 78°F | 18°C / 64°F | 21°C / 71°F | 77 hours | 15.74 mm / 0.62 In | 2 days | 1013 mb / 30 In |
| 2014 | 25°C / 78°F | 19°C / 66°F | 22°C / 71°F | 68 hours | 45.81 mm / 1.80 In | 8 days | 1011 mb / 30 In |
| 2015 | 25°C / 77°F | 18°C / 65°F | 21°C / 71°F | 67 hours | 33.52 mm / 1.32 In | 5 days | 1016 mb / 30 In |
| 2016 | 27°C / 80°F | 19°C / 66°F | 23°C / 73°F | 72 hours | 20.29 mm / 0.80 In | 4 days | 1013 mb / 30 In |
| 2017 | 26°C / 80°F | 20°C / 68°F | 23°C / 73°F | 69 hours | 44.04 mm / 1.73 In | 10 days | 1012 mb / 30 In |
| 2018 | 26°C / 80°F | 20°C / 67°F | 23°C / 73°F | 76 hours | 27.52 mm / 1.08 In | 4 days | 1013 mb / 30 In |
| 2019 | 27°C / 80°F | 18°C / 65°F | 22°C / 72°F | 85 hours | 3.40 mm / 0.13 In | 1 days | 1013 mb / 30 In |
| 2020 | 23°C / 74°F | 18°C / 65°F | 21°C / 69°F | 41 hours | 57.10 mm / 2.25 In | 11 days | 1014 mb / 30 In |
| 2021 | 23°C / 74°F | 18°C / 65°F | 21°C / 69°F | 47 hours | 19.50 mm / 0.77 In | 6 days | 1014 mb / 30 In |
| 2022 | 23°C / 73°F | 16°C / 62°F | 20°C / 67°F | 63 hours | 9.10 mm / 0.36 In | 4 days | 1014 mb / 30 In |
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