| 日期 | 天气 | 高/低 | 降水 |
|---|---|---|---|
| 2023-12-01 | 中雨 | 9°/2° | 13.6 mm |
| 2023-12-02 | 大雨 | 9°/7° | 17.6 mm |
| 2023-12-03 | 中雨 | 13°/7° | 27.7 mm |
| 2023-12-04 | 毛毛雨 | 16°/11° | 2.6 mm |
| 2023-12-05 | 中雨 | 16°/13° | 28.9 mm |
| 2023-12-06 | 中雨 | 13°/8° | 24.3 mm |
| 2023-12-07 | 中雪 | 8°/6° | 11.4 mm |
| 2023-12-08 | 小毛毛雨 | 7°/2° | 0.1 mm |
| 2023-12-09 | 中雨 | 5°/1° | 12.9 mm |
| 2023-12-10 | 中雨 | 10°/6° | 17.2 mm |
| 2023-12-11 | 雾 | 10°/5° | 0.0 mm |
| 2023-12-12 | 雾 | 9°/2° | 0.0 mm |
| 2023-12-13 | 阴 | 9°/6° | 0.0 mm |
| 2023-12-14 | 小毛毛雨 | 9°/5° | 0.4 mm |
| 2023-12-15 | 多云 | 8°/3° | 0.0 mm |
| 2023-12-16 | 阴 | 9°/0° | 0.0 mm |
| 2023-12-17 | 雾 | 7°/-1° | 0.0 mm |
| 2023-12-18 | 阴 | 7°/4° | 0.0 mm |
| 2023-12-19 | 中雨 | 8°/3° | 13.6 mm |
| 2023-12-20 | 雾 | 8°/2° | 0.0 mm |
| 2023-12-21 | 雾 | 7°/0° | 0.0 mm |
| 2023-12-22 | 中雨 | 7°/2° | 7.6 mm |
| 2023-12-23 | 雾 | 4°/0° | 0.0 mm |
| 2023-12-24 | 雾 | 5°/0° | 0.0 mm |
| 2023-12-25 | 中雨 | 4°/2° | 8.1 mm |
| 2023-12-26 | 小雨 | 7°/4° | 2.9 mm |
| 2023-12-27 | 大毛毛雨 | 7°/6° | 1.1 mm |
| 2023-12-28 | 大雨 | 8°/5° | 10.5 mm |
| 2023-12-29 | 大毛毛雨 | 10°/7° | 1.5 mm |
| 2023-12-30 | 毛毛雨 | 9°/6° | 0.8 mm |
| 2023-12-31 | 雾 | 6°/4° | 0.0 mm |
2023年12月波特兰共记录 31 天，平均最高 8℃、最低 4℃，降水日 19 天。