半旬ごとの値
 |  |
 |  |
 |  |  |  |  |
 |  |  |  |  |  |
 |  |  |  |  |
八丈島（東京都) 2009年（半旬ごとの値） 詳細（気温・蒸気圧・湿度）
| 月 | 半旬 | 日～日 | 気温(℃) | 蒸気圧 (hPa) | 湿度(％) | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 日平均 | 最高気温 | 最低気温 | 各階級の日数（平均） | 各階級の日数（最低） | 各階級の日数（最高） | ||||||||||||||||||||
| 平均 | 平均 | 最高 | 最低 | 平均 | 最低 | 最高 | ＜0℃ | ≧25℃ | ＜0℃ | ≧25℃ | ＜0℃ | ≧25℃ | ≧30℃ | ≧35℃ | 平均 | 平均 | 最小 | ||||||||
| 値 | 日 | 値 | 日 | 値 | 日 | 値 | 日 | 値 | 日 | ||||||||||||||||
| 第1半旬 | 1～ 5 | 9.0 | 11.5 | 13.6 | 05 | 10.5 | 03 | 6.4 | 5.2 | 04 | 7.7 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 64 | 44 | 05* | |
| 第2半旬 | 6～10 | 11.0 | 13.8 | 15.7 | 09 | 11.9 | 10 | 8.8 | 6.7 | 10 | 11.0 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.4 | 79 | 40 | 10 | |
| 第3半旬 | 11～15 | 7.6 | 10.5 | 12.1 | 14 | 9.0 | 15 | 5.5 | 5.0 | 11 | 6.0 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.5 | 62 | 34 | 14 | |
| 第4半旬 | 16～20 | 10.4 | 13.8 | 16.7 | 19 | 11.2 | 16 | 6.8 | 5.3 | 16 | 9.3 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.8 | 69 | 46 | 18 | |
| 第5半旬 | 21～25 | 11.2 | 14.9 | 18.8 | 23 | 10.9 | 25 | 8.5 | 5.0 | 25 | 12.7 | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.1 | 80 | 45 | 25 | |
| 第6半旬 | 26～31 | 11.9 | 15.0 | 19.7 | 30 | 10.7 | 27 | 7.9 | 5.4 | 27 | 13.7 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.2 | 86 | 56 | 27 | |
| 第1半旬 | 1～ 5 | 11.0 | 14.6 | 15.3 | 03 | 13.2 | 01 | 8.1 | 6.6 | 02 | 9.2 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.0 | 76 | 42 | 01 | |
| 第2半旬 | 6～10 | 10.2 | 13.7 | 15.4 | 09 | 11.7 | 10 | 6.8 | 6.4 | 10 | 7.3 | 06 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.8 | 71 | 42 | 08 | |
| 第3半旬 | 11～15 | 13.2 | 17.2 | 21.9 | 15 | 14.0 | 11 | 9.5 | 5.7 | 11 | 13.6 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.8 | 70 | 11 | 15 | |
| 第4半旬 | 16～20 | 8.8 | 11.6 | 16.3 | 20 | 8.0 | 17 | 5.5 | 3.4 | 17 | 8.7 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.1 | 69 | 46 | 17 | |
| 第5半旬 | 21～25 | 12.2 | 15.0 | 17.7 | 25 | 10.0 | 21 | 9.4 | 6.1 | 21 | 13.2 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.2 | 83 | 48 | 21 | |
| 第6半旬 | 26～28 | 11.8 | 13.8 | 17.4 | 26 | 10.7 | 28 | 10.2 | 9.0 | 28 | 11.7 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.1 | 94 | 71 | 26 | |
| 第1半旬 | 1～ 5 | 10.5 | 13.1 | 15.8 | 05 | 10.8 | 01 | 8.3 | 5.6 | 02 | 9.6 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.4 | 82 | 55 | 02 | |
| 第2半旬 | 6～10 | 12.5 | 15.9 | 18.0 | 06 | 13.5 | 07 | 10.2 | 8.2 | 08 | 13.1 | 06 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.2 | 83 | 53 | 07 | |
| 第3半旬 | 11～15 | 9.8 | 13.4 | 15.9 | 14 | 11.7 | 15* | 6.6 | 5.1 | 13 | 8.1 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.5 | 68 | 34 | 12 | |
| 第4半旬 | 16～20 | 14.2 | 17.7 | 19.4 | 19* | 15.5 | 20 | 10.6 | 8.0 | 18 | 13.4 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.6 | 77 | 31 | 17 | |
| 第5半旬 | 21～25 | 12.7 | 16.7 | 17.8 | 25 | 15.6 | 24 | 8.7 | 5.9 | 25 | 12.4 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.2 ] | 77 ] | 20 ] | 24 | |
| 第6半旬 | 26～31 | 10.1 | 13.4 | 14.5 | 27 | 11.5 | 26 | 6.6 | 5.7 | 27 | 7.4 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.3 ) | 66 ) | 38 ) | 28 | |
| 第1半旬 | 1～ 5 | 12.2 | 16.2 | 19.6 | 04 | 13.9 | 02 | 8.6 | 7.9 | 04* | 9.8 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.8 | 76 | 37 | 02 | |
| 第2半旬 | 6～10 | 14.8 | 19.8 | 22.2 | 10 | 17.1 | 06 | 10.9 | 8.2 | 06 | 12.4 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.5 | 70 | 33 | 07 | |
| 第3半旬 | 11～15 | 17.1 | 20.1 | 20.9 | 15 | 18.2 | 12 | 14.0 | 10.9 | 13 | 16.6 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.3 | 79 | 42 | 11 | |
| 第4半旬 | 16～20 | 18.1 | 21.0 | 22.5 | 19 | 18.7 | 18 | 15.3 | 14.4 | 16 | 16.9 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.3 | 79 | 55 | 16 | |
| 第5半旬 | 21～25 | 17.9 | 20.7 | 21.3 | 22 | 19.8 | 23 | 15.0 | 12.5 | 24 | 17.0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.5 | 75 | 40 | 23 | |
| 第6半旬 | 26～30 | 14.6 | 18.7 | 21.2 | 30 | 15.5 | 27 | 11.7 | 9.5 | 29 | 14.4 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.1 | 62 | 33 | 30 | |
| 第1半旬 | 1～ 5 | 17.2 | 21.4 | 22.4 | 04* | 18.5 | 05 | 13.4 | 11.9 | 01 | 16.0 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.6 | 70 | 38 | 01 | |
| 第2半旬 | 6～10 | 18.8 | 22.3 | 24.0 | 09 | 21.5 | 07 | 16.7 | 15.3 | 09 | 17.4 | 07 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.3 | 89 | 53 | 09 | |
| 第3半旬 | 11～15 | 18.5 | 21.3 | 23.6 | 14 | 19.5 | 15 | 16.8 | 14.4 | 15 | 18.2 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.5 | 81 | 49 | 14 | |
| 第4半旬 | 16～20 | 18.6 | 22.2 | 23.2 | 20 | 20.8 | 16 | 15.7 | 13.1 | 16 | 17.6 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.4 | 81 | 46 | 18 | |
| 第5半旬 | 21～25 | 19.1 | 22.3 | 23.8 | 21 | 20.3 | 24 | 16.7 | 15.7 | 24 | 17.8 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.1 | 87 | 30 | 21 | |
| 第6半旬 | 26～31 | 19.2 | 22.7 | 24.5 | 29 | 20.8 | 28 | 16.7 | 14.6 | 26 | 18.8 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.9 | 89 | 50 | 26 | |
| 第1半旬 | 1～ 5 | 18.9 | 21.6 | 24.7 | 02 | 18.4 | 05 | 16.0 | 14.6 | 02 | 17.0 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.2 | 84 | 51 | 01 | |
| 第2半旬 | 6～10 | 20.3 | 23.0 | 24.5 | 08 | 20.2 | 06 | 18.4 | 17.5 | 07 | 19.8 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 21.8 | 92 | 70 | 08 | |
| 第3半旬 | 11～15 | 20.5 | 23.0 | 24.3 | 15 | 21.5 | 11 | 18.6 | 17.1 | 12 | 19.6 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 21.6 | 90 | 56 | 12 | |
| 第4半旬 | 16～20 | 21.2 | 24.6 | 26.8 | 20 | 23.4 | 18 | 18.1 | 17.1 | 18 | 19.4 | 20 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 21.8 | 87 | 62 | 20 | |
| 第5半旬 | 21～25 | 21.9 | 23.6 | 24.5 | 22 | 22.1 | 25 | 20.7 | 18.1 | 25 | 21.7 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 25.7 | 98 ) | 83 ] | 25 | |
| 第6半旬 | 26～30 | 22.3 | 25.0 | 28.3 | 29 | 22.9 | 28 | 19.8 | 18.5 | 26 | 21.8 | 30 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 24.5 | 91 | 47 | 29 | |
| 第1半旬 | 1～ 5 | 22.7 | 25.0 | 26.8 | 05 | 23.5 | 01 | 21.3 | 19.9 | 03 | 22.1 | 01 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 26.5 | 96 | 76 | 05 | |
| 第2半旬 | 6～10 | 24.1 | 26.5 | 28.3 | 07 | 25.1 | 09 | 22.3 | 20.7 | 06 | 23.4 | 08 | 0 | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 29.4 | 98 | 82 | 07 | |
| 第3半旬 | 11～15 | 24.5 | 26.4 | 27.7 | 15 | 24.3 | 11 | 23.2 | 22.3 | 11 | 23.5 | 14* | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 30.2 | 98 | 85 | 15 | |
| 第4半旬 | 16～20 | 25.2 | 27.7 | 28.7 | 19 | 26.4 | 17 | 23.8 | 23.4 | 19 | 24.3 | 20 | 0 | 2 | 0 | 0 | 0 | 5 | 0 | 0 | 31.2 | 97 | 67 | 16 | |
| 第5半旬 | 21～25 | 25.5 | 28.1 | 29.4 | 24 | 26.5 | 22 | 23.5 | 22.6 | 22 | 25.5 | 25 | 0 | 3 | 0 | 1 | 0 | 5 | 0 | 0 | 30.8 | 95 | 80 | 24 | |
| 第6半旬 | 26～31 | 26.7 | 30.1 | 31.5 | 30 | 28.4 | 31 | 24.7 | 24.1 | 31 | 25.3 | 28 | 0 | 6 | 0 | 2 | 0 | 6 | 3 | 0 | 31.2 | 89 | 67 | 28 | |
| 第1半旬 | 1～ 5 | 25.8 | 28.6 | 29.8 | 03 | 27.7 | 05 | 24.0 | 23.7 | 03* | 24.4 | 01 | 0 | 5 | 0 | 0 | 0 | 5 | 0 | 0 | 31.5 | 95 | 73 | 03 | |
| 第2半旬 | 6～10 | 27.6 | 30.8 | 32.3 | 08 | 29.8 | 06 | 25.4 | 24.1 | 07 | 26.4 | 10 | 0 | 5 | 0 | 4 | 0 | 5 | 4 | 0 | 32.1 | 87 | 68 | 08 | |
| 第3半旬 | 11～15 | 26.6 | 29.1 | 31.2 | 14 | 27.6 | 11 | 25.0 | 23.9 | 12 | 26.5 | 13 | 0 | 5 | 0 | 2 | 0 | 5 | 1 | 0 | 31.0 | 89 | 62 | 14 | |
| 第4半旬 | 16～20 | 25.3 | 27.4 | 28.9 | 20 | 26.4 | 18 | 24.0 | 23.2 | 19 | 24.8 | 18 | 0 | 4 | 0 | 0 | 0 | 5 | 0 | 0 | 28.0 | 87 | 69 | 16 | |
| 第5半旬 | 21～25 | 25.4 ) | 28.2 ) | 29.4 ) | 22 | 25.2 ) | 24 | 22.8 | 19.8 | 24 | 25.9 | 22 | 0 ) | 3 ) | 0 | 1 | 0 | 5 | 0 ) | 0 ) | 28.8 ) | 89 ) | 67 ] | 25 | |
| 第6半旬 | 26～31 | 24.8 | 27.8 | 30.0 | 28 | 25.4 | 31 | 22.3 | 20.3 | 31 | 23.8 | 30 | 0 | 3 | 0 | 0 | 0 | 6 | 1 | 0 | 27.1 | 87 | 60 | 26 | |
| 第1半旬 | 1～ 5 | 23.9 | 26.4 | 29.7 | 01 | 23.6 | 03 | 22.5 | 21.9 | 03 | 24.1 | 01 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 28.3 | 96 | 78 | 01 | |
| 第2半旬 | 6～10 | 23.4 | 25.7 | 27.1 | 08 | 23.1 | 09 | 21.4 | 18.7 | 10 | 22.7 | 08 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 25.8 | 89 | 51 | 10 | |
| 第3半旬 | 11～15 | 23.1 | 26.9 | 27.3 | 15 | 26.3 | 13 | 20.1 | 19.1 | 14 | 21.3 | 12 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 23.9 | 84 | 51 | 14 | |
| 第4半旬 | 16～20 | 21.4 | 23.5 | 25.6 | 17 | 22.0 | 18 | 20.0 | 19.3 | 20* | 21.0 | 18 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 22.5 | 88 | 51 | 20 | |
| 第5半旬 | 21～25 | 22.3 | 24.7 | 26.5 | 23 | 23.2 | 25 | 19.9 | 17.6 | 22 | 22.3 | 25 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 22.0 | 82 | 55 | 23* | |
| 第6半旬 | 26～30 | 23.9 | 26.4 | 28.1 | 29 | 23.9 | 26 | 22.4 | 22.1 | 26 | 22.9 | 29 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 25.8 | 86 | 63 | 27 | |
| 第1半旬 | 1～ 5 | 23.0 | 25.4 | 27.4 | 03 | 23.2 | 04 | 20.8 | 18.9 | 05 | 21.8 | 03 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 25.6 | 91 | 70 | 03 | |
| 第2半旬 | 6～10 | 21.4 | 24.0 | 26.2 | 08 | 22.0 | 10 | 19.5 | 17.2 | 10 | 21.5 | 08 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 21.3 | 83 | 59 | 08 | |
| 第3半旬 | 11～15 | 19.2 | 22.5 | 23.7 | 13 | 20.9 | 14 | 16.8 | 15.2 | 14 | 18.1 | 13* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.8 | 76 | 49 | 13 | |
| 第4半旬 | 16～20 | 20.3 | 23.9 | 25.5 | 20 | 21.8 | 17 | 17.0 | 15.3 | 17 | 18.5 | 20 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 18.4 | 77 | 52 | 19 | |
| 第5半旬 | 21～25 | 19.0 | 21.3 | 23.4 | 23 | 20.0 | 22 | 16.6 | 15.9 | 24 | 17.8 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.1 | 83 | 56 | 22 | |
| 第6半旬 | 26～31 | 20.2 | 23.0 | 24.3 | 30 | 20.5 | 29 | 17.4 | 16.0 | 27 | 19.2 | 28 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20.1 | 85 | 57 | 28 | |
| 第1半旬 | 1～ 5 | 17.2 | 21.2 | 24.0 | 01 | 16.9 | 03 | 13.3 | 9.1 | 04 | 17.3 | 01 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.4 | 76 | 37 | 03 | |
| 第2半旬 | 6～10 | 18.6 | 23.5 | 24.1 | 10 | 22.5 | 07 | 14.9 | 13.7 | 07 | 15.7 | 09* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.9 | 80 | 53 | 06 | |
| 第3半旬 | 11～15 | 19.4 | 22.0 | 24.3 | 11 | 19.0 | 12 | 16.9 | 16.1 | 13 | 17.8 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.5 | 86 | 59 | 15 | |
| 第4半旬 | 16～20 | 15.6 | 18.8 | 22.0 | 17 | 17.1 | 18 | 12.9 | 11.7 | 20 | 14.0 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14.4 | 81 | 59 | 16 | |
| 第5半旬 | 21～25 | 16.1 | 18.9 | 21.1 | 25 | 16.5 | 21 | 12.8 | 11.2 | 21 | 14.5 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14.9 | 81 | 50 | 22 | |
| 第6半旬 | 26～30 | 17.3 | 20.6 | 23.1 | 27 | 19.3 | 29 | 14.7 | 13.7 | 30 | 16.1 | 27 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14.7 | 75 | 45 | 26 | |
| 第1半旬 | 1～ 5 | 16.1 | 18.4 | 20.5 | 02 | 17.0 | 04 | 13.7 | 12.8 | 05 | 15.0 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14.4 | 78 | 50 | 04 | |
| 第2半旬 | 6～10 | 14.0 | 16.8 | 18.0 | 10* | 14.7 | 07 | 11.1 | 8.6 | 08 | 13.6 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.4 | 78 | 58 | 10* | |
| 第3半旬 | 11～15 | 14.5 | 17.6 | 19.4 | 12 | 15.3 | 15 | 12.6 | 9.8 | 15 | 14.9 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.8 | 76 | 45 | 15* | |
| 第4半旬 | 16～20 | 9.0 | 10.9 | 11.8 | 17* | 10.0 | 19* | 7.1 | 4.9 | 20 | 8.7 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 60 | 35 | 20 | |
| 第5半旬 | 21～25 | 11.0 | 13.8 | 15.6 | 24 | 10.9 | 21 | 8.4 | 6.2 | 22 | 10.4 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.5 | 64 | 44 | 21 | |
| 第6半旬 | 26～31 | 11.6 | 15.5 | 17.3 | 26 | 12.8 | 29 | 7.9 | 5.9 | 31 | 9.5 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.3 | 74 | 42 | 31 | |