平年値（日ごとの値）
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八丈島（東京都) 1月 平年値（日ごとの値） 主な要素
| 要素 | 降水量 (mm) | 平均気温 (℃) | 最高気温 (℃) | 最低気温 (℃) | 日照時間 (時間) | 全天日射量 (MJ/㎡) | 平均雲量 | 降雪の深さ合計 (cm) | 最深積雪 (cm) |
|---|---|---|---|---|---|---|---|---|---|
| 統計期間 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2009 | 1991～ 2009 | 1991～ 2009 | 1991～ 2009 |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 19 | 19 | 19 | 19 |
| 1日 | 5.2 | 10.9 | 13.7 | 8.2 | 3.0 | 6.8 @ | 7.1 @ | 0 @ | --- @ |
| 2日 | 5.3 | 10.8 | 13.7 | 8.1 | 3.0 | 6.8 @ | 7.2 @ | 0 @ | --- @ |
| 3日 | 5.3 | 10.7 | 13.6 | 8.1 | 2.9 | 6.7 @ | 7.2 @ | 0 @ | --- @ |
| 4日 | 5.4 | 10.7 | 13.5 | 8.0 | 2.9 | 6.7 @ | 7.2 @ | 0 @ | --- @ |
| 5日 | 5.5 | 10.6 | 13.4 | 8.0 | 2.8 | 6.7 @ | 7.3 @ | 0 @ | --- @ |
| 6日 | 5.6 | 10.6 | 13.4 | 8.0 | 2.8 | 6.7 @ | 7.3 @ | 0 @ | --- @ |
| 7日 | 5.8 | 10.5 | 13.3 | 7.9 | 2.8 | 6.7 @ | 7.4 @ | 0 @ | --- @ |
| 8日 | 6.0 | 10.5 | 13.2 | 7.9 | 2.8 | 6.7 @ | 7.4 @ | 0 @ | --- @ |
| 9日 | 6.2 | 10.4 | 13.2 | 7.9 | 2.7 | 6.7 @ | 7.5 @ | 0 @ | --- @ |
| 10日 | 6.4 | 10.4 | 13.1 | 7.8 | 2.7 | 6.8 @ | 7.5 @ | 0 @ | --- @ |
| 11日 | 6.6 | 10.3 | 13.1 | 7.8 | 2.7 | 6.8 @ | 7.5 @ | 0 @ | --- @ |
| 12日 | 6.9 | 10.3 | 13.0 | 7.8 | 2.7 | 6.8 @ | 7.6 @ | 0 @ | --- @ |
| 13日 | 7.1 | 10.2 | 13.0 | 7.7 | 2.7 | 6.8 @ | 7.6 @ | 0 @ | --- @ |
| 14日 | 7.2 | 10.2 | 12.9 | 7.7 | 2.6 | 6.8 @ | 7.7 @ | 0 @ | --- @ |
| 15日 | 7.4 | 10.2 | 12.9 | 7.7 | 2.6 | 6.8 @ | 7.7 @ | 0 @ | --- @ |
| 16日 | 7.5 | 10.1 | 12.8 | 7.6 | 2.6 | 6.8 @ | 7.8 @ | 0 @ | --- @ |
| 17日 | 7.6 | 10.1 | 12.8 | 7.6 | 2.6 | 6.8 @ | 7.8 @ | 0 @ | --- @ |
| 18日 | 7.6 | 10.0 | 12.8 | 7.5 | 2.6 | 6.8 @ | 7.9 @ | 0 @ | --- @ |
| 19日 | 7.6 | 10.0 | 12.7 | 7.5 | 2.6 | 6.8 @ | 7.9 @ | --- @ | --- @ |
| 20日 | 7.5 | 9.9 | 12.7 | 7.4 | 2.6 | 6.8 @ | 7.9 @ | --- @ | --- @ |
| 21日 | 7.4 | 9.9 | 12.6 | 7.4 | 2.6 | 6.9 @ | 8.0 @ | 0 @ | --- @ |
| 22日 | 7.2 | 9.8 | 12.6 | 7.3 | 2.6 | 7.0 @ | 8.0 @ | 0 @ | 0 @ |
| 23日 | 7.1 | 9.8 | 12.6 | 7.2 | 2.7 | 7.1 @ | 8.0 @ | 0 @ | --- @ |
| 24日 | 7.0 | 9.8 | 12.5 | 7.2 | 2.7 | 7.2 @ | 8.0 @ | 0 @ | --- @ |
| 25日 | 6.8 | 9.7 | 12.5 | 7.1 | 2.7 | 7.3 @ | 7.9 @ | 0 @ | --- @ |
| 26日 | 6.7 | 9.7 | 12.5 | 7.1 | 2.7 | 7.4 @ | 7.9 @ | 0 @ | --- @ |
| 27日 | 6.5 | 9.7 | 12.5 | 7.0 | 2.8 | 7.5 @ | 7.9 @ | --- @ | --- @ |
| 28日 | 6.4 | 9.6 | 12.5 | 7.0 | 2.8 | 7.6 @ | 7.9 @ | 0 @ | --- @ |
| 29日 | 6.4 | 9.6 | 12.5 | 7.0 | 2.8 | 7.7 @ | 7.8 @ | 0 @ | --- @ |
| 30日 | 6.3 | 9.6 | 12.6 | 6.9 | 2.9 | 7.9 @ | 7.8 @ | 0 @ | --- @ |
| 31日 | 6.3 | 9.7 | 12.6 | 6.9 | 2.9 | 8.0 @ | 7.8 @ | 0 @ | --- @ |
- 「@」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。