旬ごとの値
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八丈島（東京都) 1999年（旬ごとの値） 詳細（日照・雪・その他）
| 月 | 旬 | 日照時間(h) | 全天日射量 (MJ/㎡) | 雪(cm) | 雲量 | 大気現象 | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 合計 | 日照率 | 各階級の日数 | 降雪 | 各階級の日数（降雪） | 最深積雪 | 各階級の日数（最深積雪） | 平均 | 各階級の日数 | 雪日数 | 霧日数 | 雷日数 | |||||||||||||||||||
| 不照 | 日照率 ≧40% | 平均 | 合計 | 日合計の最大 | ≧3cm | ≧5cm | ≧10cm | ≧20cm | ≧50cm | ≧100cm | 値 | 日 | ≧0cm | ≧1cm | ≧5cm | ≧10cm | ≧20cm | ≧50cm | ≧100cm | ＜1.5 | ≧8.5 | |||||||||
| 値 | 日 | |||||||||||||||||||||||||||||
| 上旬 | 34.9 | 35 | 0 | 3 | 7.9 | 0 | 0 | 09* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 0 | 3 | 1 | 0 | 0 | ||
| 中旬 | 31.4 | 31 | 2 | 3 | 7.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 0 | 1 | 0 | 0 | 0 | |||
| 下旬 | 38.6 | 34 | 1 | 4 | 8.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.9 | 0 | 4 | 0 | 0 | 0 | |||
| 上旬 | 31.1 | 29 | 2 | 4 | 9.0 | 0 | 0 | 05* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 04 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 0 | 3 | 2 | 0 | 1 | |
| 中旬 | 33.9 | 31 | 0 | 2 | 10.1 | 0 | 0 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 0 | 4 | 1 | 0 | 0 | ||
| 下旬 | 37.6 | 42 | 1 | 6 | 11.6 | 0 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.6 | 0 | 2 | 0 | 0 | 0 | ||
| 上旬 | 36.2 | 31 | 1 | 2 | 10.8 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 1 | 3 | 0 | 0 | 0 | |||
| 中旬 | 22.7 | 19 | 3 | 3 | 9.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.6 | 0 | 6 | 0 | 0 | 0 | |||
| 下旬 | 32.1 | 24 | 4 | 4 | 10.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.0 | 0 | 6 | 0 | 0 | 0 | |||
| 上旬 | 57.6 | 46 | 2 | 5 | 17.0 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.9 | 0 | 4 | 0 | 0 | 0 | |||
| 中旬 | 33.1 | 26 | 2 | 3 | 12.7 ) | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.3 | 0 | 6 | 0 | 0 | 1 | |||
| 下旬 | 53.7 | 40 | 1 | 6 | 16.5 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 0 | 3 | 0 | 0 | 0 | |||
| 上旬 | 59.0 | 44 | 2 | 6 | 19.2 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 0 | 4 | 0 | 0 | 0 | |||
| 中旬 | 63.4 | 46 | 1 | 7 | 18.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.6 | 0 | 4 | 0 | 0 | 0 | |||
| 下旬 | 40.7 | 26 | 4 | 3 | 14.5 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.9 | 0 | 8 | 0 | 0 | 0 | |||
| 上旬 | 48.7 | 34 | 1 | 4 | 18.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.1 | 0 | 5 | 0 | 0 | 1 | |||
| 中旬 | 19.6 | 14 | 2 | 1 | 14.5 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.3 | 0 | 9 | 0 | 0 | 0 | |||
| 下旬 | 17.5 | 12 | 2 | 1 | 13.7 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.9 | 0 | 10 | 0 | 0 | 0 | |||
| 上旬 | 16.6 | 12 | 2 | 0 | 12.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.7 | 0 | 10 | 0 | 0 | 1 | |||
| 中旬 | 35.5 | 25 | 0 | 3 | 16.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.6 | 0 | 7 | 0 | 0 | 1 | |||
| 下旬 | 87.0 | 57 | 0 | 8 | 23.2 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.4 | 0 | 4 | 0 | 0 | 0 | |||
| 上旬 | 51.6 | 38 | 1 | 5 | 18.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 0 | 4 | 0 | 0 | 0 | |||
| 中旬 | 65.1 | 49 | 0 | 5 | 19.3 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 0 | 3 | 0 | 0 | 1 | |||
| 下旬 | 76.5 | 53 | 0 | 6 | 19.2 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 0 | 4 | 0 | 0 | 1 | |||
| 上旬 | 67.0 | 53 | 1 | 7 | 18.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.2 | 0 | 2 | 0 | 0 | 2 | |||
| 中旬 | 60.3 ) | 49 ) | 0 | 8 | 16.1 ) | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 0 | 1 | 0 | 0 | 3 | |||
| 下旬 | 41.4 | 34 | 1 | 4 | 13.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.3 | 0 | 5 | 0 | 0 | 1 | |||
| 上旬 | 49.9 | 43 | 0 | 6 | 13.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 0 | 4 | 0 | 0 | 1 | |||
| 中旬 | 36.8 | 32 | 2 | 4 | 10.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.9 | 0 | 5 | 0 | 0 | 1 | |||
| 下旬 | 45.4 | 37 | 1 | 6 | 10.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.6 | 0 | 5 | 0 | 0 | 0 | |||
| 上旬 | 40.1 | 37 | 1 | 5 | 9.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.9 | 0 | 3 | 0 | 0 | 4 | |||
| 中旬 | 52.4 | 50 | 0 | 7 | 10.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.5 | 0 | 3 | 0 | 0 | 0 | |||
| 下旬 | 29.2 | 29 | 2 | 4 | 7.3 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 0 | 5 | 0 | 0 | 1 | |||
| 上旬 | 31.7 | 32 | 3 | 4 | 7.0 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.6 | 0 | 3 | 0 | 0 | 0 | |||
| 中旬 | 28.7 | 29 | 1 | 4 | 6.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 0 | 3 | 0 | 0 | 0 | |||
| 下旬 | 46.0 | 42 | 0 | 7 | 8.4 | 0 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.3 | 0 | 1 | 0 | 0 | 0 | ||