平年値（年・月ごとの値）
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大島（東京都) 平年値（年・月ごとの値） 主な要素
| 要素 | 気圧 | 降水量 | 気温 | 蒸気圧 | 相対湿度 | 風向・風速 | 日照時間 | 全天日射量 | 雪 | 雲量 | 大気現象 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 現地平均 (hPa) | 海面平均 (hPa) | 合計 (mm) | 平均 (℃) | 日最高 (℃) | 日最低 (℃) | 平均 (hPa) | 平均 (％) | 平均 (m/s) | 最多風向 | 合計 (時) | 平均 (MJ/㎡) | 降雪の深さ | 最深積雪 (cm) | 平均 | 雪日数 | 霧日数 | 雷日数 | ||
| 合計 (cm) | 日合計の最大 (cm) | ||||||||||||||||||
| 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～ 2009 | 1991～ 2009 | 1991～ 2009 | 1991～ 2009 | 1991～ 2009 | 2009～ 2020 | 2009～ 2020 | 1991～ 2009 |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 19 | 19 | 19 | 19 | 19 | 12 | 12 | 19 |
| 1月 | 1006.2 | 1015.4 | 137.3 | 7.5 | 11.0 | 3.9 | 6.8 | 64 | 5.4 | 北東 | 153.7 | 8.8 @ | 0 @ | 0 @ | 0 @ | 5.3 @ | 4.2 | 0.0 | 1.1 @ |
| 2月 | 1006.4 | 1015.6 | 146.0 | 7.8 | 11.6 | 4.0 | 7.1 | 66 | 5.2 | 北東 | 145.4 | 11.6 @ | 1 @ | 1 @ | 1 @ | 5.6 @ | 4.4 | 0.0 | 0.8 @ |
| 3月 | 1005.8 | 1014.9 | 238.4 | 10.4 | 14.2 | 6.6 | 9.0 | 70 | 5.4 | 北東 | 158.1 | 13.2 @ | 0 @ | 0 @ | --- @ | 6.6 @ | 1.3 | 0.3 | 1.2 @ |
| 4月 | 1004.9 | 1013.9 | 247.4 | 14.4 | 18.2 | 10.7 | 12.4 | 74 | 5.2 | 北東 | 174.2 | 16.4 @ | 0 @ | 0 @ | --- @ | 6.6 @ | 0.0 | 0.3 | 1.4 @ |
| 5月 | 1003.1 | 1012.0 | 256.5 | 18.2 | 21.9 | 14.8 | 16.6 | 79 | 4.7 | 南南西 | 179.7 | 17.0 @ | --- @ | --- @ | --- @ | 7.4 @ | 0.0 | 1.4 | 1.1 @ |
| 6月 | 1000.4 | 1009.1 | 328.8 | 21.0 | 24.3 | 18.4 | 21.3 | 85 | 4.3 | 南南西 | 125.1 | 15.0 @ | --- @ | --- @ | --- @ | 8.3 @ | 0.0 | 2.2 | 1.1 @ |
| 7月 | 1000.5 | 1009.1 | 255.9 | 24.6 | 27.8 | 22.2 | 27.1 | 87 | 4.6 | 南南西 | 150.8 | 16.4 @ | --- @ | --- @ | --- @ | 8.1 @ | 0.0 | 2.5 | 1.9 @ |
| 8月 | 1001.6 | 1010.2 | 191.7 | 26.0 | 29.5 | 23.5 | 28.8 | 86 | 4.3 | 南南西 | 190.1 | 17.8 @ | --- @ | --- @ | --- @ | 7.1 @ | 0.0 | 0.3 | 2.4 @ |
| 9月 | 1004.0 | 1012.6 | 341.3 | 23.4 | 26.7 | 20.8 | 24.1 | 83 | 4.6 | 北東 | 141.0 | 13.7 @ | --- @ | --- @ | --- @ | 7.4 @ | 0.0 | 0.0 | 2.5 @ |
| 10月 | 1007.1 | 1016.0 | 405.2 | 18.9 | 22.0 | 16.1 | 17.3 | 79 | 5.0 | 北東 | 131.4 | 10.6 @ | --- @ | --- @ | --- @ | 6.7 @ | 0.0 | 0.0 | 1.6 @ |
| 11月 | 1008.7 | 1017.7 | 192.8 | 14.5 | 17.8 | 11.3 | 12.3 | 74 | 5.1 | 北東 | 140.3 | 9.1 @ | 0 @ | 0 @ | --- @ | 5.8 @ | 0.0 | 0.0 | 1.7 @ |
| 12月 | 1007.5 | 1016.7 | 117.6 | 10.0 | 13.4 | 6.5 | 8.5 | 68 | 5.4 | 北東 | 147.6 | 8.1 @ | 0 @ | 0 @ | --- @ | 5.0 @ | 1.7 | 0.2 | 1.2 @ |
| 年 | 1004.7 | 1013.6 | 2858.9 | 16.4 | 19.9 | 13.2 | 15.9 | 76 | 4.9 | 北東 | 1837.2 | 13.1 @ | 2 @ | 1 @ | 1 @ | 6.7 @ | 12.2 | 7.0 | 17.8 @ |
- 「@」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。