平年値（日ごとの値）
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八丈島 12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 | /// | 10.0 | 8.4 | 5.6 | 3.2 | -1.2 | -7.7 | -15.6 | -25.7 | -31.5 | -37.8 | -44.8 | -52.8 | -57.2 | -61.7 | -66.0 | -68.7 | -66.7 | -61.6 | -58.9 | -55.9 | /// | /// | /// | /// |
| 2日 | /// | 9.8 | 8.2 | 5.4 | 3.0 | -1.4 | -7.9 | -15.8 | -25.9 | -31.6 | -37.9 | -44.8 | -52.8 | -57.1 | -61.7 | -65.9 | -68.6 | -66.6 | -61.6 | -58.9 | -55.9 | /// | /// | /// | /// |
| 3日 | /// | 9.6 | 8.0 | 5.2 | 2.8 | -1.6 | -8.1 | -16.0 | -26.0 | -31.7 | -37.9 | -44.8 | -52.8 | -57.1 | -61.6 | -65.8 | -68.5 | -66.5 | -61.6 | -58.8 | -55.9 | /// | /// | /// | /// |
| 4日 | /// | 9.4 | 7.8 | 5.0 | 2.6 | -1.8 | -8.3 | -16.1 | -26.1 | -31.8 | -38.0 | -44.9 | -52.8 | -57.1 | -61.6 | -65.7 | -68.3 | -66.4 | -61.5 | -58.8 | -55.8 | /// | /// | /// | /// |
| 5日 | /// | 9.2 | 7.6 | 4.7 | 2.4 | -2.0 | -8.5 | -16.3 | -26.3 | -31.9 | -38.1 | -44.9 | -52.8 | -57.1 | -61.5 | -65.6 | -68.2 | -66.3 | -61.5 | -58.8 | -55.8 | /// | /// | /// | /// |
| 6日 | /// | 9.0 | 7.4 | 4.5 | 2.2 | -2.2 | -8.7 | -16.5 | -26.4 | -32.0 | -38.1 | -45.0 | -52.8 | -57.1 | -61.5 | -65.4 | -68.1 | -66.3 | -61.5 | -58.7 | -55.8 | /// | /// | /// | /// |
| 7日 | /// | 8.9 | 7.2 | 4.3 | 2.0 | -2.4 | -8.9 | -16.6 | -26.5 | -32.1 | -38.2 | -45.0 | -52.8 | -57.1 | -61.4 | -65.3 | -68.0 | -66.2 | -61.5 | -58.7 | -55.7 | /// | /// | /// | /// |
| 8日 | /// | 8.7 | 7.0 | 4.0 | 1.8 | -2.6 | -9.1 | -16.8 | -26.7 | -32.2 | -38.3 | -45.0 | -52.8 | -57.0 | -61.4 | -65.2 | -67.9 | -66.2 | -61.5 | -58.7 | -55.7 | -51.4 | /// | /// | /// |
| 9日 | /// | 8.5 | 6.8 | 3.8 | 1.6 | -2.8 | -9.3 | -16.9 | -26.8 | -32.3 | -38.3 | -45.0 | -52.8 | -57.0 | -61.3 | -65.2 | -67.8 | -66.2 | -61.4 | -58.6 | -55.6 | -51.5 | /// | /// | /// |
| 10日 | /// | 8.4 | 6.7 | 3.6 | 1.4 | -3.0 | -9.5 | -17.1 | -26.9 | -32.4 | -38.4 | -44.9 | -52.7 | -56.9 | -61.3 | -65.1 | -67.7 | -66.2 | -61.4 | -58.6 | -55.6 | -51.5 | -48.9 | /// | /// |
| 11日 | /// | 8.2 | 6.5 | 3.4 | 1.2 | -3.2 | -9.6 | -17.2 | -27.0 | -32.4 | -38.4 | -44.9 | -52.7 | -56.9 | -61.2 | -65.0 | -67.7 | -66.2 | -61.4 | -58.5 | -55.6 | -51.5 | -48.9 | /// | /// |
| 12日 | /// | 8.0 | 6.3 | 3.2 | 1.0 | -3.4 | -9.8 | -17.3 | -27.0 | -32.5 | -38.4 | -44.8 | -52.6 | -56.8 | -61.2 | -65.0 | -67.6 | -66.1 | -61.4 | -58.5 | -55.5 | -51.5 | -49.0 | /// | /// |
| 13日 | /// | 7.9 | 6.2 | 3.0 | 0.8 | -3.5 | -10.0 | -17.5 | -27.1 | -32.5 | -38.5 | -44.7 | -52.5 | -56.8 | -61.1 | -64.9 | -67.5 | -66.1 | -61.3 | -58.4 | -55.5 | -51.6 | -49.0 | /// | /// |
| 14日 | /// | 7.7 | 6.1 | 2.9 | 0.6 | -3.7 | -10.2 | -17.6 | -27.2 | -32.6 | -38.5 | -44.7 | -52.4 | -56.7 | -61.1 | -64.9 | -67.5 | -66.1 | -61.3 | -58.4 | -55.5 | -51.6 | -49.0 | /// | /// |
| 15日 | /// | 7.6 | 5.9 | 2.7 | 0.4 | -3.9 | -10.3 | -17.7 | -27.3 | -32.6 | -38.4 | -44.6 | -52.4 | -56.7 | -61.1 | -64.8 | -67.4 | -66.0 | -61.2 | -58.3 | -55.5 | -51.7 | -49.0 | /// | /// |
| 16日 | /// | 7.5 | 5.8 | 2.6 | 0.2 | -4.1 | -10.5 | -17.9 | -27.4 | -32.6 | -38.4 | -44.6 | -52.3 | -56.6 | -61.0 | -64.8 | -67.3 | -66.0 | -61.1 | -58.3 | -55.4 | -51.7 | -49.1 | /// | /// |
| 17日 | /// | 7.4 | 5.7 | 2.5 | 0.1 | -4.2 | -10.6 | -18.0 | -27.5 | -32.7 | -38.4 | -44.5 | -52.2 | -56.6 | -61.0 | -64.7 | -67.2 | -65.9 | -61.1 | -58.2 | -55.4 | -51.8 | -49.1 | /// | /// |
| 18日 | /// | 7.3 | 5.6 | 2.3 | -0.1 | -4.4 | -10.8 | -18.2 | -27.6 | -32.7 | -38.4 | -44.5 | -52.2 | -56.5 | -60.9 | -64.6 | -67.1 | -65.8 | -61.0 | -58.2 | -55.4 | -51.8 | -49.2 | /// | /// |
| 19日 | /// | 7.2 | 5.5 | 2.2 | -0.2 | -4.5 | -10.9 | -18.3 | -27.7 | -32.8 | -38.4 | -44.5 | -52.1 | -56.5 | -60.8 | -64.5 | -67.0 | -65.7 | -60.9 | -58.2 | -55.4 | -51.9 | -49.3 | /// | /// |
| 20日 | /// | 7.1 | 5.4 | 2.1 | -0.3 | -4.6 | -11.1 | -18.5 | -27.8 | -32.8 | -38.4 | -44.5 | -52.0 | -56.4 | -60.7 | -64.4 | -66.8 | -65.6 | -60.9 | -58.2 | -55.4 | -51.9 | -49.3 | /// | /// |
| 21日 | /// | 7.0 | 5.3 | 2.0 | -0.4 | -4.8 | -11.2 | -18.6 | -27.9 | -32.9 | -38.4 | -44.5 | -51.9 | -56.3 | -60.7 | -64.3 | -66.7 | -65.5 | -60.9 | -58.2 | -55.4 | -51.9 | -49.4 | /// | /// |
| 22日 | /// | 6.9 | 5.1 | 1.9 | -0.5 | -4.9 | -11.3 | -18.8 | -28.1 | -33.0 | -38.5 | -44.4 | -51.9 | -56.2 | -60.5 | -64.2 | -66.6 | -65.5 | -60.8 | -58.2 | -55.4 | -52.0 | -49.5 | /// | /// |
| 23日 | /// | 6.8 | 5.0 | 1.8 | -0.7 | -5.0 | -11.4 | -18.9 | -28.2 | -33.1 | -38.5 | -44.4 | -51.7 | -56.1 | -60.4 | -64.1 | -66.5 | -65.4 | -60.8 | -58.2 | -55.4 | -52.0 | -49.6 | /// | /// |
| 24日 | /// | 6.7 | 4.9 | 1.7 | -0.8 | -5.1 | -11.5 | -19.1 | -28.3 | -33.3 | -38.5 | -44.4 | -51.6 | -55.9 | -60.3 | -64.0 | -66.3 | -65.3 | -60.8 | -58.2 | -55.4 | -52.0 | -49.6 | /// | /// |
| 25日 | /// | 6.6 | 4.8 | 1.6 | -0.9 | -5.2 | -11.6 | -19.2 | -28.5 | -33.4 | -38.6 | -44.4 | -51.5 | -55.8 | -60.1 | -63.9 | -66.2 | -65.2 | -60.8 | -58.2 | -55.4 | -52.0 | -49.7 | /// | /// |
| 26日 | /// | 6.5 | 4.7 | 1.5 | -1.0 | -5.4 | -11.8 | -19.3 | -28.6 | -33.5 | -38.7 | -44.3 | -51.4 | -55.6 | -60.0 | -63.7 | -66.1 | -65.2 | -60.9 | -58.2 | -55.4 | -52.1 | -49.7 | /// | /// |
| 27日 | /// | 6.3 | 4.6 | 1.3 | -1.2 | -5.5 | -11.9 | -19.5 | -28.8 | -33.7 | -38.8 | -44.3 | -51.3 | -55.5 | -59.8 | -63.6 | -66.0 | -65.1 | -60.9 | -58.2 | -55.4 | -52.1 | -49.8 | /// | /// |
| 28日 | /// | 6.2 | 4.4 | 1.2 | -1.3 | -5.6 | -12.0 | -19.6 | -28.9 | -33.9 | -38.9 | -44.3 | -51.2 | -55.3 | -59.7 | -63.5 | -65.9 | -65.0 | -60.9 | -58.2 | -55.4 | -52.1 | -49.8 | /// | /// |
| 29日 | /// | 6.1 | 4.3 | 1.1 | -1.4 | -5.7 | -12.1 | -19.7 | -29.0 | -34.0 | -39.0 | -44.4 | -51.1 | -55.2 | -59.6 | -63.4 | -65.8 | -65.0 | -60.9 | -58.2 | -55.4 | -52.2 | -49.9 | /// | /// |
| 30日 | /// | 6.0 | 4.2 | 1.0 | -1.5 | -5.8 | -12.2 | -19.8 | -29.2 | -34.2 | -39.1 | -44.4 | -51.0 | -55.1 | -59.4 | -63.3 | -65.7 | -64.9 | -60.9 | -58.2 | -55.4 | -52.3 | -50.0 | /// | /// |
| 31日 | /// | 5.9 | 4.1 | 0.9 | -1.6 | -5.9 | -12.3 | -19.9 | -29.3 | -34.3 | -39.2 | -44.5 | -51.0 | -55.0 | -59.3 | -63.2 | -65.6 | -64.9 | -60.9 | -58.2 | -55.3 | -52.4 | -50.1 | /// | /// |