平年値（日ごとの値）
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八丈島 9月21時
| 要素 | 気温(℃) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 指定気圧面 | 1000hPa | 925hPa | 900hPa | 850hPa | 800hPa | 700hPa | 600hPa | 500hPa | 400hPa | 350hPa | 300hPa | 250hPa | 200hPa | 175hPa | 150hPa | 125hPa | 100hPa | 70hPa | 50hPa | 40hPa | 30hPa | 20hPa | 15hPa | 10hPa | 5hPa |
| 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 | 1993～ 2020 |
| 資料年数 | 21 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 28 | 24 | 3 |
| 1日 | /// | 21.7 | 20.8 | 18.6 | 16.0 | 10.4 | 3.7 | -4.5 | -14.9 | -21.6 | -29.9 | -39.8 | -51.4 | -57.6 | -63.8 | -69.5 | -72.3 | -67.2 | -60.6 | -57.3 | -53.9 | -49.0 | /// | /// | /// |
| 2日 | /// | 21.7 | 20.8 | 18.5 | 15.9 | 10.3 | 3.6 | -4.5 | -14.9 | -21.7 | -29.9 | -39.8 | -51.4 | -57.6 | -63.8 | -69.5 | -72.3 | -67.3 | -60.7 | -57.3 | -53.9 | -49.0 | /// | /// | /// |
| 3日 | /// | 21.6 | 20.7 | 18.5 | 15.9 | 10.3 | 3.6 | -4.6 | -15.0 | -21.7 | -29.9 | -39.9 | -51.4 | -57.6 | -63.9 | -69.5 | -72.4 | -67.3 | -60.7 | -57.3 | -53.9 | -49.1 | /// | /// | /// |
| 4日 | /// | 21.6 | 20.6 | 18.4 | 15.8 | 10.2 | 3.5 | -4.6 | -15.0 | -21.8 | -30.0 | -39.9 | -51.4 | -57.6 | -63.9 | -69.6 | -72.5 | -67.4 | -60.7 | -57.4 | -54.0 | -49.1 | /// | /// | /// |
| 5日 | /// | 21.5 | 20.6 | 18.3 | 15.7 | 10.2 | 3.4 | -4.7 | -15.1 | -21.8 | -30.0 | -39.9 | -51.4 | -57.6 | -63.9 | -69.6 | -72.5 | -67.5 | -60.7 | -57.4 | -54.0 | -49.1 | /// | /// | /// |
| 6日 | /// | 21.5 | 20.5 | 18.2 | 15.6 | 10.1 | 3.4 | -4.7 | -15.2 | -21.9 | -30.1 | -40.0 | -51.4 | -57.6 | -63.9 | -69.6 | -72.6 | -67.5 | -60.8 | -57.4 | -54.0 | -49.2 | /// | /// | /// |
| 7日 | /// | 21.4 | 20.4 | 18.2 | 15.6 | 10.1 | 3.3 | -4.8 | -15.2 | -22.0 | -30.1 | -40.0 | -51.5 | -57.7 | -64.0 | -69.6 | -72.6 | -67.6 | -60.8 | -57.4 | -54.0 | -49.2 | /// | /// | /// |
| 8日 | /// | 21.3 | 20.3 | 18.1 | 15.5 | 10.0 | 3.2 | -4.9 | -15.3 | -22.0 | -30.2 | -40.1 | -51.5 | -57.7 | -64.0 | -69.7 | -72.7 | -67.7 | -60.8 | -57.5 | -54.0 | -49.3 | /// | /// | /// |
| 9日 | /// | 21.2 | 20.3 | 18.0 | 15.4 | 9.9 | 3.2 | -5.0 | -15.4 | -22.1 | -30.3 | -40.1 | -51.6 | -57.7 | -64.0 | -69.7 | -72.7 | -67.7 | -60.8 | -57.5 | -54.0 | -49.3 | /// | /// | /// |
| 10日 | /// | 21.2 | 20.2 | 17.9 | 15.3 | 9.9 | 3.1 | -5.0 | -15.5 | -22.2 | -30.4 | -40.2 | -51.6 | -57.7 | -64.0 | -69.7 | -72.8 | -67.8 | -60.8 | -57.5 | -54.0 | -49.4 | /// | /// | /// |
| 11日 | /// | 21.1 | 20.1 | 17.8 | 15.2 | 9.8 | 3.0 | -5.1 | -15.5 | -22.3 | -30.4 | -40.3 | -51.6 | -57.8 | -64.0 | -69.8 | -72.8 | -67.9 | -60.8 | -57.5 | -54.0 | -49.4 | /// | /// | /// |
| 12日 | /// | 20.9 | 20.0 | 17.7 | 15.1 | 9.7 | 3.0 | -5.1 | -15.6 | -22.3 | -30.5 | -40.3 | -51.7 | -57.8 | -64.0 | -69.8 | -72.8 | -67.9 | -60.8 | -57.6 | -54.0 | -49.4 | /// | /// | /// |
| 13日 | /// | 20.8 | 19.9 | 17.5 | 15.0 | 9.6 | 2.9 | -5.2 | -15.7 | -22.4 | -30.6 | -40.4 | -51.7 | -57.8 | -64.0 | -69.8 | -72.9 | -67.9 | -60.8 | -57.6 | -54.1 | -49.4 | /// | /// | /// |
| 14日 | /// | 20.7 | 19.7 | 17.4 | 14.9 | 9.6 | 2.9 | -5.3 | -15.7 | -22.5 | -30.6 | -40.5 | -51.8 | -57.8 | -64.0 | -69.8 | -72.9 | -68.0 | -60.9 | -57.6 | -54.1 | -49.5 | /// | /// | /// |
| 15日 | /// | 20.6 | 19.6 | 17.3 | 14.8 | 9.5 | 2.8 | -5.3 | -15.8 | -22.5 | -30.7 | -40.6 | -51.8 | -57.8 | -64.0 | -69.8 | -72.9 | -68.0 | -60.9 | -57.7 | -54.1 | -49.5 | /// | /// | /// |
| 16日 | /// | 20.4 | 19.5 | 17.1 | 14.7 | 9.4 | 2.8 | -5.4 | -15.8 | -22.6 | -30.8 | -40.6 | -51.9 | -57.9 | -64.0 | -69.8 | -72.9 | -68.0 | -61.0 | -57.7 | -54.1 | /// | /// | /// | /// |
| 17日 | /// | 20.3 | 19.3 | 17.0 | 14.5 | 9.3 | 2.7 | -5.5 | -15.9 | -22.7 | -30.8 | -40.7 | -51.9 | -57.9 | -64.0 | -69.8 | -72.9 | -68.0 | -61.0 | -57.8 | -54.1 | /// | /// | /// | /// |
| 18日 | /// | 20.1 | 19.1 | 16.8 | 14.4 | 9.2 | 2.6 | -5.5 | -16.0 | -22.7 | -30.9 | -40.7 | -51.9 | -57.9 | -64.0 | -69.8 | -72.9 | -68.0 | -61.1 | -57.8 | /// | /// | /// | /// | /// |
| 19日 | /// | 20.0 | 19.0 | 16.6 | 14.2 | 9.1 | 2.5 | -5.6 | -16.1 | -22.8 | -31.0 | -40.8 | -52.0 | -58.0 | -64.1 | -69.7 | -72.9 | -67.9 | -61.1 | -57.9 | /// | /// | /// | /// | /// |
| 20日 | /// | 19.8 | 18.8 | 16.5 | 14.1 | 9.0 | 2.4 | -5.7 | -16.1 | -22.9 | -31.0 | -40.9 | -52.0 | -58.0 | -64.1 | -69.7 | -72.9 | -67.9 | -61.2 | -58.0 | /// | /// | /// | /// | /// |
| 21日 | /// | 19.7 | 18.6 | 16.3 | 14.0 | 8.9 | 2.3 | -5.8 | -16.2 | -23.0 | -31.1 | -40.9 | -52.1 | -58.0 | -64.1 | -69.7 | -72.9 | -67.9 | -61.2 | -58.1 | /// | /// | /// | /// | /// |
| 22日 | /// | 19.5 | 18.5 | 16.2 | 13.8 | 8.8 | 2.2 | -5.9 | -16.3 | -23.1 | -31.2 | -41.0 | -52.1 | -58.1 | -64.1 | -69.7 | -72.9 | -67.9 | -61.2 | -58.1 | /// | /// | /// | /// | /// |
| 23日 | /// | 19.4 | 18.3 | 16.0 | 13.7 | 8.7 | 2.1 | -6.0 | -16.5 | -23.2 | -31.3 | -41.1 | -52.2 | -58.1 | -64.1 | -69.6 | -72.9 | -67.9 | -61.3 | -58.2 | /// | /// | /// | /// | /// |
| 24日 | /// | 19.2 | 18.2 | 15.8 | 13.5 | 8.6 | 2.0 | -6.1 | -16.6 | -23.3 | -31.4 | -41.2 | -52.2 | -58.2 | -64.0 | -69.6 | -72.8 | -67.9 | -61.3 | -58.3 | /// | /// | /// | /// | /// |
| 25日 | /// | 19.1 | 18.0 | 15.7 | 13.4 | 8.5 | 1.9 | -6.2 | -16.7 | -23.4 | -31.6 | -41.3 | -52.3 | -58.2 | -64.0 | -69.6 | -72.8 | -67.9 | -61.3 | -58.3 | -54.9 | /// | /// | /// | /// |
| 26日 | /// | 19.0 | 17.9 | 15.6 | 13.3 | 8.4 | 1.8 | -6.3 | -16.8 | -23.5 | -31.7 | -41.4 | -52.3 | -58.2 | -64.0 | -69.5 | -72.9 | -67.9 | -61.4 | -58.4 | -54.9 | /// | /// | /// | /// |
| 27日 | /// | 18.9 | 17.8 | 15.5 | 13.2 | 8.4 | 1.7 | -6.4 | -16.9 | -23.6 | -31.8 | -41.5 | -52.4 | -58.2 | -64.0 | -69.5 | -72.9 | -68.0 | -61.4 | -58.4 | -55.0 | /// | /// | /// | /// |
| 28日 | /// | 18.8 | 17.7 | 15.4 | 13.2 | 8.3 | 1.6 | -6.4 | -17.0 | -23.7 | -31.9 | -41.5 | -52.4 | -58.3 | -64.0 | -69.5 | -72.9 | -68.0 | -61.4 | -58.4 | -55.0 | /// | /// | /// | /// |
| 29日 | /// | 18.7 | 17.6 | 15.3 | 13.1 | 8.2 | 1.5 | -6.5 | -17.1 | -23.8 | -32.0 | -41.6 | -52.5 | -58.3 | -64.0 | -69.5 | -72.9 | -68.1 | -61.5 | -58.4 | -55.0 | /// | /// | /// | /// |
| 30日 | /// | 18.6 | 17.5 | 15.2 | 13.0 | 8.1 | 1.5 | -6.6 | -17.2 | -23.9 | -32.0 | -41.7 | -52.5 | -58.3 | -64.0 | -69.5 | -73.0 | -68.1 | -61.5 | -58.5 | -55.0 | /// | /// | /// | /// |