平年値（日ごとの値）
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八丈島 4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 | /// | 9.3 | 7.9 | 5.6 | 3.2 | -1.7 | -8.3 | -16.3 | -26.7 | -33.4 | -41.0 | -48.8 | -54.8 | -56.8 | -58.9 | -62.1 | -65.1 | -65.2 | -60.7 | -57.1 | -54.5 | -51.7 | /// | /// | /// |
| 2日 | /// | 9.4 | 8.1 | 5.7 | 3.4 | -1.6 | -8.2 | -16.1 | -26.7 | -33.4 | -40.9 | -48.9 | -54.9 | -56.9 | -59.0 | -62.1 | -65.1 | -65.2 | -60.7 | -57.1 | -54.5 | -51.6 | /// | /// | /// |
| 3日 | /// | 9.6 | 8.3 | 5.9 | 3.5 | -1.4 | -8.0 | -16.0 | -26.6 | -33.3 | -40.9 | -48.9 | -55.1 | -57.0 | -59.0 | -62.1 | -65.1 | -65.2 | -60.6 | -57.1 | -54.4 | -51.6 | /// | /// | /// |
| 4日 | /// | 9.7 | 8.4 | 6.1 | 3.7 | -1.2 | -7.9 | -15.9 | -26.5 | -33.2 | -40.8 | -48.9 | -55.2 | -57.1 | -59.1 | -62.2 | -65.1 | -65.2 | -60.6 | -57.1 | -54.4 | -51.6 | /// | /// | /// |
| 5日 | /// | 9.9 | 8.6 | 6.3 | 3.9 | -1.1 | -7.7 | -15.7 | -26.3 | -33.1 | -40.7 | -48.9 | -55.3 | -57.2 | -59.2 | -62.2 | -65.1 | -65.2 | -60.6 | -57.1 | -54.4 | -51.6 | /// | /// | /// |
| 6日 | /// | 10.0 | 8.8 | 6.4 | 4.0 | -0.9 | -7.6 | -15.6 | -26.2 | -32.9 | -40.6 | -48.9 | -55.4 | -57.3 | -59.3 | -62.3 | -65.1 | -65.2 | -60.6 | -57.1 | -54.4 | -51.6 | /// | /// | /// |
| 7日 | /// | 10.2 | 9.0 | 6.6 | 4.2 | -0.8 | -7.4 | -15.4 | -26.1 | -32.8 | -40.5 | -48.9 | -55.5 | -57.5 | -59.4 | -62.3 | -65.2 | -65.2 | -60.6 | -57.1 | -54.3 | -51.6 | /// | /// | /// |
| 8日 | /// | 10.3 | 9.1 | 6.8 | 4.4 | -0.6 | -7.2 | -15.3 | -26.0 | -32.7 | -40.4 | -48.8 | -55.6 | -57.6 | -59.5 | -62.4 | -65.2 | -65.2 | -60.6 | -57.1 | -54.3 | -51.6 | /// | /// | /// |
| 9日 | /// | 10.5 | 9.3 | 6.9 | 4.5 | -0.5 | -7.1 | -15.1 | -25.9 | -32.6 | -40.3 | -48.8 | -55.7 | -57.7 | -59.6 | -62.5 | -65.3 | -65.2 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 10日 | /// | 10.6 | 9.5 | 7.1 | 4.7 | -0.3 | -6.9 | -15.0 | -25.7 | -32.4 | -40.2 | -48.7 | -55.8 | -57.9 | -59.8 | -62.6 | -65.4 | -65.2 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 11日 | /// | 10.7 | 9.6 | 7.3 | 4.9 | -0.2 | -6.7 | -14.9 | -25.6 | -32.3 | -40.1 | -48.7 | -55.9 | -58.0 | -59.9 | -62.6 | -65.5 | -65.2 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 12日 | /// | 10.9 | 9.8 | 7.4 | 5.0 | 0.0 | -6.6 | -14.7 | -25.5 | -32.2 | -39.9 | -48.6 | -56.0 | -58.2 | -60.1 | -62.7 | -65.5 | -65.3 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 13日 | /// | 11.0 | 9.9 | 7.6 | 5.2 | 0.2 | -6.4 | -14.6 | -25.4 | -32.0 | -39.8 | -48.5 | -56.1 | -58.3 | -60.2 | -62.8 | -65.6 | -65.3 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 14日 | /// | 11.2 | 10.1 | 7.8 | 5.4 | 0.3 | -6.2 | -14.4 | -25.2 | -31.9 | -39.7 | -48.5 | -56.2 | -58.5 | -60.4 | -62.9 | -65.7 | -65.3 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 15日 | /// | 11.3 | 10.2 | 7.9 | 5.6 | 0.5 | -6.0 | -14.2 | -25.1 | -31.7 | -39.6 | -48.4 | -56.3 | -58.6 | -60.5 | -63.0 | -65.8 | -65.4 | -60.6 | -57.1 | -54.3 | /// | /// | /// | /// |
| 16日 | /// | 11.4 | 10.4 | 8.1 | 5.8 | 0.7 | -5.8 | -14.1 | -24.9 | -31.6 | -39.4 | -48.3 | -56.4 | -58.7 | -60.6 | -63.1 | -65.9 | -65.5 | -60.7 | -57.1 | -54.3 | /// | /// | /// | /// |
| 17日 | /// | 11.6 | 10.5 | 8.2 | 5.9 | 0.9 | -5.6 | -13.9 | -24.8 | -31.4 | -39.3 | -48.3 | -56.4 | -58.9 | -60.7 | -63.2 | -66.0 | -65.5 | -60.7 | -57.1 | -54.3 | /// | /// | /// | /// |
| 18日 | /// | 11.7 | 10.6 | 8.3 | 6.1 | 1.1 | -5.4 | -13.7 | -24.6 | -31.2 | -39.1 | -48.2 | -56.5 | -59.0 | -60.9 | -63.3 | -66.1 | -65.6 | -60.7 | -57.1 | -54.3 | /// | /// | /// | /// |
| 19日 | /// | 11.8 | 10.7 | 8.5 | 6.2 | 1.2 | -5.3 | -13.6 | -24.5 | -31.1 | -39.0 | -48.1 | -56.5 | -59.1 | -60.9 | -63.4 | -66.2 | -65.7 | -60.7 | -57.1 | -54.2 | /// | /// | /// | /// |
| 20日 | /// | 11.9 | 10.8 | 8.6 | 6.4 | 1.4 | -5.1 | -13.4 | -24.3 | -30.9 | -38.9 | -48.0 | -56.5 | -59.2 | -61.0 | -63.4 | -66.2 | -65.8 | -60.7 | -57.1 | -54.2 | /// | /// | /// | /// |
| 21日 | /// | 12.0 | 10.9 | 8.7 | 6.5 | 1.5 | -5.0 | -13.3 | -24.2 | -30.8 | -38.7 | -47.9 | -56.5 | -59.2 | -61.1 | -63.5 | -66.3 | -65.9 | -60.7 | -57.1 | -54.2 | /// | /// | /// | /// |
| 22日 | /// | 12.1 | 11.0 | 8.8 | 6.6 | 1.6 | -4.9 | -13.2 | -24.0 | -30.7 | -38.6 | -47.8 | -56.5 | -59.3 | -61.2 | -63.5 | -66.4 | -65.9 | -60.7 | -57.1 | -54.1 | /// | /// | /// | /// |
| 23日 | /// | 12.2 | 11.1 | 8.9 | 6.7 | 1.7 | -4.8 | -13.1 | -23.9 | -30.6 | -38.5 | -47.7 | -56.5 | -59.3 | -61.2 | -63.6 | -66.4 | -66.0 | -60.7 | -57.1 | -54.1 | /// | /// | /// | /// |
| 24日 | /// | 12.3 | 11.2 | 9.0 | 6.8 | 1.8 | -4.7 | -13.0 | -23.8 | -30.5 | -38.4 | -47.6 | -56.5 | -59.3 | -61.2 | -63.6 | -66.4 | -66.0 | -60.7 | -57.1 | -54.1 | /// | /// | /// | /// |
| 25日 | /// | 12.4 | 11.3 | 9.2 | 6.9 | 1.9 | -4.6 | -12.9 | -23.8 | -30.4 | -38.3 | -47.5 | -56.4 | -59.3 | -61.2 | -63.6 | -66.4 | -66.1 | -60.7 | -57.2 | -54.0 | /// | /// | /// | /// |
| 26日 | /// | 12.5 | 11.5 | 9.3 | 7.1 | 2.0 | -4.6 | -12.9 | -23.7 | -30.3 | -38.2 | -47.4 | -56.4 | -59.3 | -61.2 | -63.6 | -66.4 | -66.1 | -60.7 | -57.2 | -54.0 | /// | /// | /// | /// |
| 27日 | /// | 12.7 | 11.6 | 9.5 | 7.2 | 2.1 | -4.5 | -12.8 | -23.6 | -30.2 | -38.2 | -47.3 | -56.4 | -59.4 | -61.3 | -63.6 | -66.4 | -66.2 | -60.7 | -57.2 | -54.0 | /// | /// | /// | /// |
| 28日 | /// | 12.8 | 11.8 | 9.7 | 7.4 | 2.2 | -4.4 | -12.7 | -23.5 | -30.1 | -38.1 | -47.2 | -56.3 | -59.4 | -61.3 | -63.6 | -66.4 | -66.2 | -60.7 | -57.2 | -53.9 | /// | /// | /// | /// |
| 29日 | /// | 13.0 | 12.0 | 9.8 | 7.6 | 2.4 | -4.3 | -12.5 | -23.4 | -30.0 | -38.0 | -47.1 | -56.3 | -59.5 | -61.4 | -63.6 | -66.4 | -66.3 | -60.7 | -57.2 | -53.9 | /// | /// | /// | /// |
| 30日 | /// | 13.2 | 12.2 | 10.0 | 7.8 | 2.5 | -4.2 | -12.4 | -23.2 | -29.9 | -37.8 | -47.0 | -56.2 | -59.5 | -61.4 | -63.6 | -66.4 | -66.3 | -60.7 | -57.2 | -53.9 | /// | /// | /// | /// |