月ごとの値
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八丈島（東京都) 1981年（月ごとの値） 詳細（日照・雪・その他）
| 月 | 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 | ||||||||||||||||||||||||||||
| 149.4 | 47 | 0 | 19 | 9.3 | 0 | 0 | 22* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 0 | 5 | 1 | 0 | 3 | ||
| 109.4 | 36 | 4 | 13 | 9.5 | 2 | 2 | 27 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 27 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 8.4 | 0 | 16 | 3 | 0 | 1 | |
| 134.9 | 37 | 7 | 14 | 10.4 ) | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.0 | 0 | 15 | 0 | 0 | 1 | |||
| 172.4 | 44 | 3 | 16 | 14.8 | 0 | 0 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.8 | 0 | 11 | 0 | 0 | 1 | ||
| 195.7 | 46 | 5 | 20 | 17.5 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 0 | 12 | 0 | 0 | 0 | |||
| 142.3 | 33 | 7 | 12 | 15.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.1 | 0 | 18 | 0 | 3 | 1 | |||
| 231.7 | 53 | 0 | 21 | 20.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.1 | 0 | 10 | 0 | 0 | 6 | |||
| 187.6 | 45 | 1 | 18 | 16.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.6 | 0 | 15 | 0 | 0 | 3 | |||
| 124.3 | 34 | 4 | 13 | 12.0 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.4 | 0 | 20 | 0 | 0 | 0 | |||
| 171.8 | 49 | 4 | 20 | 11.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.2 | 3 | 9 | 0 | 0 | 2 | |||
| 103.3 | 33 | 6 | 15 | 7.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.6 | 0 | 12 | 0 | 0 | 1 | |||
| 132.8 | 43 | 1 | 16 | 7.4 | 0 | 0 | 16* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 1 | 6 | 0 | 0 | 2 | ||