３か月ごとの値
 |  |
 |  |
 |  |  |  |  |
 |  |  |  |  |  |
 |  |  |  |  |
八丈島（東京都) 1993年（３か月ごとの値） 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 | ||||||||||||||||||||||||||||
11～1 | 231.6 | 25 | 15 | 25 | 6.1 | 0 | 0 | 01/28* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 01/22 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 7.5 | 1 | 35 | 1 | 0 | 15 |
12～2 | 223.2 | 24 | 10 | 21 | 6.5 | 0 | 0 | 02/24* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 01/22 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 0 | 33 | 2 | 0 | 19 |
1～3 | 235.9 | 24 | 15 | 23 | 7.8 | 0 | 0 | 03/13* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 01/22 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 7.8 | 1 | 42 | 3 | 0 | 14 |
2～4 | 357.2 | 34 | 10 | 35 | 11.3 | 0 | 0 | 04/12* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.1 | 3 | 33 | 2 | 4 | 12 | |
3～5 | 435.0 | 37 | 17 | 45 | 13.6 | 0 | 0 | 04/12* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 3 | 41 | 1 | 8 | 9 | |
4～6 | 463.8 | 37 | 18 | 47 | 14.8 | 0 | 0 | 04/12 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 2 | 41 | 0 | 17 | 6 | |
5～7 | 354.5 | 27 | 28 | 35 | 13.1 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.5 | 1 | 60 | 0 | 13 | 5 | ||
6～8 | 326.0 | 26 | 24 | 29 | 12.7 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.4 | 2 | 64 | 0 | 9 | 9 | ||
7～9 | 341.4 | 28 | 16 | 29 | 12.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.1 | 3 | 59 | 0 | 0 | 14 | ||
8～10 | 392.2 | 35 | 7 | 38 | 12.4 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 3 | 45 | 0 | 0 | 11 | ||
9～11 | 369.2 | 36 | 9 | 39 | 10.3 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 3 | 37 | 0 | 0 | 6 | ||
10～12 | 299.9 | 31 | 14 | 34 | 7.9 | 0 | 0 | 12/23* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 2 | 39 | 0 | 0 | 3 | |