平年値（日ごとの値）
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室蘭（胆振地方) 12月 平年値（日ごとの値） 詳細（気温）
| 要素 | 気温 | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 平均 (℃) | 最高 (℃) | 最低 (℃) | 1時間毎の気温(℃) | ||||||||||||||||||||||||
| 01時 | 02時 | 03時 | 04時 | 05時 | 06時 | 07時 | 08時 | 09時 | 10時 | 11時 | 12時 | 13時 | 14時 | 15時 | 16時 | 17時 | 18時 | 19時 | 20時 | 21時 | 22時 | 23時 | 24時 | ||||
| 統計期間 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| 1日 | 2.8 | 5.4 | 0.3 | 2.5 | 2.5 | 2.4 | 2.3 | 2.3 | 2.2 | 2.2 | 2.5 | 2.9 | 3.4 | 3.7 | 3.8 | 3.8 | 3.7 | 3.4 | 3.1 | 2.9 | 2.8 | 2.7 | 2.6 | 2.5 | 2.5 | 2.4 | 2.4 |
| 2日 | 2.6 | 5.2 | 0.1 | 2.3 | 2.3 | 2.2 | 2.1 | 2.0 | 1.9 | 1.9 | 2.2 | 2.7 | 3.1 | 3.4 | 3.6 | 3.6 | 3.4 | 3.2 | 2.8 | 2.6 | 2.5 | 2.4 | 2.4 | 2.3 | 2.2 | 2.2 | 2.1 |
| 3日 | 2.3 | 4.9 | -0.1 | 2.1 | 2.0 | 2.0 | 1.9 | 1.8 | 1.7 | 1.7 | 2.0 | 2.5 | 2.9 | 3.2 | 3.3 | 3.3 | 3.2 | 2.9 | 2.6 | 2.4 | 2.3 | 2.2 | 2.1 | 2.1 | 2.0 | 2.0 | 1.9 |
| 4日 | 2.1 | 4.7 | -0.3 | 1.8 | 1.8 | 1.7 | 1.7 | 1.6 | 1.5 | 1.5 | 1.8 | 2.2 | 2.7 | 3.0 | 3.1 | 3.1 | 3.0 | 2.7 | 2.4 | 2.2 | 2.1 | 2.0 | 1.9 | 1.9 | 1.8 | 1.7 | 1.7 |
| 5日 | 1.9 | 4.4 | -0.5 | 1.6 | 1.6 | 1.5 | 1.5 | 1.4 | 1.3 | 1.3 | 1.6 | 2.0 | 2.5 | 2.7 | 2.9 | 2.9 | 2.7 | 2.5 | 2.2 | 2.0 | 1.8 | 1.8 | 1.7 | 1.6 | 1.6 | 1.5 | 1.5 |
| 6日 | 1.7 | 4.2 | -0.7 | 1.4 | 1.4 | 1.3 | 1.3 | 1.2 | 1.1 | 1.2 | 1.4 | 1.8 | 2.2 | 2.5 | 2.7 | 2.7 | 2.5 | 2.3 | 1.9 | 1.7 | 1.6 | 1.6 | 1.5 | 1.4 | 1.4 | 1.3 | 1.3 |
| 7日 | 1.5 | 4.0 | -0.9 | 1.2 | 1.2 | 1.1 | 1.1 | 1.0 | 1.0 | 1.0 | 1.2 | 1.7 | 2.1 | 2.3 | 2.5 | 2.5 | 2.3 | 2.1 | 1.7 | 1.5 | 1.4 | 1.4 | 1.3 | 1.2 | 1.2 | 1.1 | 1.1 |
| 8日 | 1.3 | 3.8 | -1.0 | 1.0 | 1.0 | 1.0 | 0.9 | 0.8 | 0.8 | 0.8 | 1.1 | 1.5 | 1.9 | 2.1 | 2.3 | 2.3 | 2.2 | 1.9 | 1.6 | 1.3 | 1.2 | 1.2 | 1.1 | 1.0 | 1.0 | 0.9 | 0.9 |
| 9日 | 1.1 | 3.6 | -1.2 | 0.8 | 0.8 | 0.8 | 0.7 | 0.7 | 0.6 | 0.6 | 0.9 | 1.3 | 1.7 | 2.0 | 2.1 | 2.1 | 2.0 | 1.7 | 1.4 | 1.2 | 1.1 | 1.0 | 0.9 | 0.9 | 0.8 | 0.7 | 0.7 |
| 10日 | 1.0 | 3.4 | -1.4 | 0.6 | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 | 0.7 | 1.1 | 1.5 | 1.8 | 1.9 | 1.9 | 1.8 | 1.6 | 1.2 | 1.0 | 0.9 | 0.8 | 0.8 | 0.7 | 0.6 | 0.6 | 0.5 |
| 11日 | 0.8 | 3.2 | -1.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 | 0.3 | 0.4 | 0.6 | 1.0 | 1.4 | 1.7 | 1.8 | 1.8 | 1.7 | 1.4 | 1.1 | 0.9 | 0.7 | 0.7 | 0.6 | 0.5 | 0.5 | 0.4 | 0.4 |
| 12日 | 0.7 | 3.1 | -1.6 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.5 | 0.9 | 1.3 | 1.5 | 1.7 | 1.7 | 1.5 | 1.3 | 0.9 | 0.7 | 0.6 | 0.5 | 0.5 | 0.4 | 0.3 | 0.3 | 0.2 |
| 13日 | 0.6 | 2.9 | -1.7 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.8 | 1.1 | 1.4 | 1.5 | 1.5 | 1.4 | 1.2 | 0.8 | 0.6 | 0.5 | 0.4 | 0.4 | 0.3 | 0.2 | 0.2 | 0.1 |
| 14日 | 0.5 | 2.8 | -1.9 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.6 | 1.0 | 1.3 | 1.4 | 1.4 | 1.3 | 1.1 | 0.7 | 0.5 | 0.4 | 0.3 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 |
| 15日 | 0.4 | 2.7 | -2.0 | 0.0 | 0.0 | 0.0 | -0.1 | -0.1 | -0.1 | -0.1 | 0.1 | 0.5 | 0.9 | 1.2 | 1.3 | 1.3 | 1.2 | 1.0 | 0.6 | 0.4 | 0.3 | 0.2 | 0.1 | 0.1 | 0.0 | 0.0 | -0.1 |
| 16日 | 0.3 | 2.6 | -2.1 | -0.1 | -0.1 | -0.1 | -0.2 | -0.2 | -0.2 | -0.2 | 0.0 | 0.4 | 0.8 | 1.1 | 1.2 | 1.3 | 1.1 | 0.9 | 0.5 | 0.4 | 0.2 | 0.1 | 0.1 | 0.0 | 0.0 | -0.1 | -0.1 |
| 17日 | 0.2 | 2.6 | -2.1 | -0.2 | -0.2 | -0.2 | -0.3 | -0.3 | -0.3 | -0.3 | -0.1 | 0.4 | 0.8 | 1.0 | 1.2 | 1.2 | 1.1 | 0.8 | 0.5 | 0.3 | 0.2 | 0.1 | 0.0 | -0.1 | -0.1 | -0.2 | -0.2 |
| 18日 | 0.1 | 2.5 | -2.2 | -0.3 | -0.3 | -0.3 | -0.4 | -0.4 | -0.4 | -0.3 | -0.2 | 0.3 | 0.7 | 1.0 | 1.1 | 1.1 | 1.0 | 0.8 | 0.4 | 0.2 | 0.1 | 0.0 | -0.1 | -0.1 | -0.2 | -0.2 | -0.3 |
| 19日 | 0.1 | 2.4 | -2.3 | -0.3 | -0.3 | -0.4 | -0.4 | -0.4 | -0.4 | -0.4 | -0.2 | 0.2 | 0.6 | 0.9 | 1.0 | 1.1 | 0.9 | 0.7 | 0.4 | 0.2 | 0.1 | 0.0 | -0.1 | -0.2 | -0.2 | -0.3 | -0.3 |
| 20日 | 0.0 | 2.4 | -2.3 | -0.4 | -0.4 | -0.4 | -0.5 | -0.5 | -0.5 | -0.5 | -0.3 | 0.1 | 0.6 | 0.9 | 1.0 | 1.0 | 0.9 | 0.6 | 0.3 | 0.1 | 0.0 | -0.1 | -0.2 | -0.2 | -0.3 | -0.3 | -0.4 |
| 21日 | 0.0 | 2.3 | -2.4 | -0.4 | -0.5 | -0.5 | -0.6 | -0.6 | -0.6 | -0.5 | -0.4 | 0.1 | 0.5 | 0.8 | 0.9 | 1.0 | 0.8 | 0.6 | 0.2 | 0.1 | -0.1 | -0.2 | -0.2 | -0.3 | -0.3 | -0.4 | -0.4 |
| 22日 | -0.1 | 2.3 | -2.5 | -0.5 | -0.5 | -0.6 | -0.6 | -0.6 | -0.7 | -0.6 | -0.5 | 0.0 | 0.4 | 0.7 | 0.8 | 0.9 | 0.7 | 0.5 | 0.2 | 0.0 | -0.1 | -0.2 | -0.3 | -0.4 | -0.4 | -0.5 | -0.5 |
| 23日 | -0.2 | 2.2 | -2.5 | -0.6 | -0.6 | -0.6 | -0.7 | -0.7 | -0.7 | -0.7 | -0.5 | -0.1 | 0.3 | 0.6 | 0.8 | 0.8 | 0.7 | 0.4 | 0.1 | -0.1 | -0.2 | -0.3 | -0.4 | -0.4 | -0.5 | -0.5 | -0.6 |
| 24日 | -0.3 | 2.1 | -2.6 | -0.6 | -0.7 | -0.7 | -0.8 | -0.8 | -0.8 | -0.8 | -0.6 | -0.2 | 0.3 | 0.6 | 0.7 | 0.8 | 0.6 | 0.4 | 0.0 | -0.2 | -0.3 | -0.4 | -0.4 | -0.5 | -0.5 | -0.6 | -0.6 |
| 25日 | -0.3 | 2.1 | -2.7 | -0.7 | -0.7 | -0.8 | -0.8 | -0.9 | -0.9 | -0.8 | -0.7 | -0.3 | 0.2 | 0.5 | 0.6 | 0.7 | 0.5 | 0.3 | -0.1 | -0.2 | -0.3 | -0.4 | -0.5 | -0.5 | -0.6 | -0.6 | -0.7 |
| 26日 | -0.4 | 2.0 | -2.7 | -0.7 | -0.8 | -0.8 | -0.9 | -0.9 | -1.0 | -0.9 | -0.8 | -0.3 | 0.1 | 0.4 | 0.6 | 0.6 | 0.5 | 0.2 | -0.1 | -0.3 | -0.4 | -0.5 | -0.6 | -0.6 | -0.7 | -0.7 | -0.8 |
| 27日 | -0.5 | 1.9 | -2.8 | -0.8 | -0.8 | -0.9 | -1.0 | -1.0 | -1.0 | -1.0 | -0.9 | -0.4 | 0.0 | 0.3 | 0.5 | 0.6 | 0.4 | 0.1 | -0.2 | -0.4 | -0.5 | -0.6 | -0.7 | -0.7 | -0.7 | -0.8 | -0.8 |
| 28日 | -0.5 | 1.8 | -2.8 | -0.9 | -0.9 | -1.0 | -1.0 | -1.1 | -1.1 | -1.1 | -0.9 | -0.5 | -0.1 | 0.2 | 0.4 | 0.5 | 0.3 | 0.1 | -0.3 | -0.4 | -0.6 | -0.6 | -0.7 | -0.7 | -0.8 | -0.9 | -0.9 |
| 29日 | -0.6 | 1.7 | -2.9 | -0.9 | -1.0 | -1.0 | -1.1 | -1.1 | -1.2 | -1.2 | -1.0 | -0.6 | -0.1 | 0.2 | 0.3 | 0.4 | 0.2 | 0.0 | -0.4 | -0.5 | -0.6 | -0.7 | -0.8 | -0.8 | -0.9 | -0.9 | -1.0 |
| 30日 | -0.7 | 1.6 | -3.0 | -1.0 | -1.0 | -1.1 | -1.1 | -1.2 | -1.2 | -1.2 | -1.1 | -0.7 | -0.2 | 0.1 | 0.3 | 0.3 | 0.2 | 0.0 | -0.4 | -0.6 | -0.7 | -0.8 | -0.9 | -0.9 | -0.9 | -1.0 | -1.0 |
| 31日 | -0.7 | 1.5 | -3.0 | -1.1 | -1.1 | -1.2 | -1.2 | -1.2 | -1.3 | -1.3 | -1.2 | -0.8 | -0.3 | 0.0 | 0.2 | 0.3 | 0.1 | -0.1 | -0.5 | -0.6 | -0.8 | -0.8 | -0.9 | -0.9 | -1.0 | -1.1 | -1.1 |
- 「@」の付いた値は、参考値です。平年差や平年比に利用できません。