半旬ごとの値
 |  |
 |  |
 |  |  |  |  |
 |  |  |  |  |  |
 |  |  |  |  |
室蘭（胆振地方) 2021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 | -5.8 | -4.2 | -2.4 | 04 | -7.4 | 01 | -7.2 | -9.6 | 01 | -5.4 | 04 | 5 | 0 | 5 | 0 | 5 | 0 | 0 | 0 | 2.7 | 67 | 47 | 01 | |
| 第2半旬 | 6～10 | -5.2 | -2.8 | -1.1 | 07 | -3.8 | 10 | -6.7 | -7.4 | 10 | -5.3 | 07 | 5 | 0 | 5 | 0 | 5 | 0 | 0 | 0 | 2.8 | 68 | 50 | 08 | |
| 第3半旬 | 11～15 | -0.9 | 2.1 | 3.5 | 13 | -2.0 | 11 | -3.6 | -5.9 | 11 | 0.8 | 13 | 4 | 0 | 4 | 0 | 1 | 0 | 0 | 0 | 4.3 | 72 | 49 | 14 | |
| 第4半旬 | 16～20 | -3.0 | -0.6 | 6.1 | 16 | -4.4 | 19 | -5.7 | -7.9 | 19 | -2.5 | 16 | 4 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 3.8 | 74 | 44 | 18 | |
| 第5半旬 | 21～25 | -0.1 | 2.8 | 5.0 | 25 | -0.3 | 23 | -3.3 | -4.8 | 23 | -0.7 | 25 | 2 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 4.6 | 76 | 50 | 22 | |
| 第6半旬 | 26～31 | -1.0 | 1.4 | 5.6 | 27 | -2.6 | 31 | -3.1 | -5.6 | 31 | -1.1 | 29 | 3 | 0 | 6 | 0 | 2 | 0 | 0 | 0 | 4.7 | 79 | 48 | 28 | |
| 第1半旬 | 1～ 5 | -4.0 | -0.1 | 5.1 | 02 | -6.4 | 03 | -7.6 | -9.3 | 03 | -5.0 | 01 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 3.5 | 73 | 52 | 04 | |
| 第2半旬 | 6～10 | -2.1 | -0.1 | 5.2 | 06 | -4.0 | 08 | -4.5 | -6.7 | 08 | -0.7 | 06 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 4.0 | 75 | 54 | 08 | |
| 第3半旬 | 11～15 | 1.2 | 4.0 | 5.1 | 15* | 1.7 | 11 | -1.7 | -3.6 | 12 | 1.4 | 15 | 2 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 5.5 | 81 | 49 | 12 | |
| 第4半旬 | 16～20 | -0.2 | 2.6 | 5.9 | 20 | -2.4 | 17 | -2.9 | -5.1 | 17* | -0.7 | 19 | 2 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 4.8 | 78 | 51 | 20 | |
| 第5半旬 | 21～25 | -2.6 | -0.4 | 1.5 | 21 | -3.4 | 24 | -4.7 | -6.8 | 24 | -2.7 | 21 | 5 | 0 | 5 | 0 | 3 | 0 | 0 | 0 | 3.8 | 74 | 46 | 21 | |
| 第6半旬 | 26～28 | -1.6 | 2.0 | 5.6 | 28 | -0.7 | 26 | -5.4 | -6.3 | 27 | -3.6 | 28 | 2 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 4.0 | 73 | 50 | 27 | |
| 第1半旬 | 1～ 5 | 1.3 | 4.8 | 12.0 | 05 | -0.1 | 03 | -2.3 | -5.2 | 04 | 1.3 | 05 | 2 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 5.8 | 85 | 55 | 03 | |
| 第2半旬 | 6～10 | 0.2 | 4.2 | 6.3 | 06 | 0.7 | 07 | -2.6 | -5.2 | 07* | -0.2 | 10 | 2 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 4.3 | 69 | 43 | 08 | |
| 第3半旬 | 11～15 | 4.5 | 9.0 | 14.2 | 15 | 4.6 | 13 | 0.5 | -1.7 | 13 | 2.4 | 14 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 5.9 | 72 | 30 | 15 | |
| 第4半旬 | 16～20 | 3.5 | 7.7 | 10.6 | 16 | 5.4 | 20 | 0.9 | -0.8 | 20 | 2.5 | 18 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 5.6 | 72 | 31 | 16 | |
| 第5半旬 | 21～25 | 5.4 | 8.8 | 12.5 | 24 | 4.4 | 21 | 2.6 | -0.4 | 21 | 5.5 | 24 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 7.4 | 82 | 46 | 23 | |
| 第6半旬 | 26～31 | 6.6 | 11.6 | 14.7 | 31 | 8.6 | 28* | 3.2 | 1.9 | 27 | 5.3 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.7 | 79 | 30 | 27 | |
| 第1半旬 | 1～ 5 | 5.8 | 10.0 | 13.2 | 01 | 8.0 | 04 | 2.9 | 1.3 | 02 | 4.5 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.5 | 83 | 35 | 01 | |
| 第2半旬 | 6～10 | 3.5 | 7.7 | 10.9 | 10 | 6.3 | 09 | 0.5 | -1.4 | 09* | 1.9 | 07 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 5.7 | 74 | 33 | 10 | |
| 第3半旬 | 11～15 | 6.7 | 11.3 | 13.8 | 12 | 8.3 | 14 | 2.9 | 1.2 | 14 | 5.6 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 71 | 33 | 15 | |
| 第4半旬 | 16～20 | 7.7 | 11.2 | 13.1 | 20 | 9.1 | 17 | 5.1 | 3.8 | 16 | 6.4 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.4 | 81 | 24 | 20 | |
| 第5半旬 | 21～25 | 8.2 | 14.6 | 19.0 | 24 | 11.6 | 25 | 3.7 | 2.1 | 23 | 4.9 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.8 | 64 | 27 | 24 | |
| 第6半旬 | 26～30 | 8.0 | 12.3 | 14.7 | 27 | 9.9 | 26 | 4.8 | 1.8 | 26 | 7.6 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.5 | 69 | 36 | 27 | |
| 第1半旬 | 1～ 5 | 8.4 | 13.3 | 17.6 | 04 | 11.1 | 03 | 5.6 | 4.4 | 03 | 7.2 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.2 | 75 | 41 | 04 | |
| 第2半旬 | 6～10 | 11.4 | 16.6 | 18.4 | 06 | 14.0 | 10 | 8.0 | 7.2 | 10 | 9.0 | 08 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.4 | 71 | 38 | 07 | |
| 第3半旬 | 11～15 | 10.6 | 15.9 | 21.9 | 14 | 12.0 | 13 | 6.9 | 5.3 | 12 | 8.1 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.3 | 81 | 44 | 14 | |
| 第4半旬 | 16～20 | 12.4 | 16.9 | 20.3 | 17 | 11.6 | 16 | 9.3 | 8.3 | 19 | 10.1 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.2 | 92 | 62 | 18 | |
| 第5半旬 | 21～25 | 12.7 | 16.0 | 18.0 | 25 | 13.1 | 22 | 10.6 | 10.2 | 24 | 11.0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.6 | 93 | 58 | 25 | |
| 第6半旬 | 26～31 | 11.9 | 15.9 | 18.7 | 26 | 12.2 | 29 | 9.6 | 8.4 | 31 | 10.4 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.8 | 86 | 41 | 26 | |
| 第1半旬 | 1～ 5 | 13.3 | 17.5 | 22.1 | 05 | 14.5 | 01 | 9.9 | 8.2 | 01 | 11.5 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.3 | 87 | 56 | 05 | |
| 第2半旬 | 6～10 | 17.3 | 23.8 | 27.2 | 10 | 20.7 | 09 | 12.7 | 11.9 | 09 | 13.3 | 08 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 14.8 | 77 | 37 | 10 | |
| 第3半旬 | 11～15 | 17.7 | 22.0 | 26.1 | 13 | 15.9 | 15 | 14.9 | 12.8 | 15 | 16.4 | 13 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 17.3 | 86 | 57 | 13 | |
| 第4半旬 | 16～20 | 13.9 | 16.6 | 18.3 | 20 | 14.6 | 19 | 12.5 | 11.9 | 20 | 13.5 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.0 | 94 | 78 | 20 | |
| 第5半旬 | 21～25 | 15.6 | 18.2 | 22.6 | 25 | 16.2 | 24 | 14.2 | 13.4 | 21 | 15.3 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.4 | 93 | 61 | 22 | |
| 第6半旬 | 26～30 | 18.0 | 22.7 | 25.9 | 26 | 19.4 | 29 | 15.2 | 14.2 | 26 | 15.9 | 30 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 18.6 | 91 | 54 | 26 | |
| 第1半旬 | 1～ 5 | 16.6 | 18.5 | 20.2 | 03 | 17.5 | 01 | 15.5 | 14.7 | 04 | 16.2 | 02 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.1 | 96 | 77 | 04 | |
| 第2半旬 | 6～10 | 17.3 | 19.4 | 22.9 | 07 | 16.7 | 10* | 16.2 | 15.4 | 09 | 17.4 | 06 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.3 | 98 | 73 | 06 | |
| 第3半旬 | 11～15 | 18.1 | 20.5 | 21.8 | 15 | 18.5 | 11 | 16.8 | 16.0 | 11 | 17.2 | 13* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20.3 | 98 | 83 | 14 | |
| 第4半旬 | 16～20 | 24.1 | 28.7 | 31.2 | 20 | 23.1 | 16 | 20.1 | 17.9 | 16 | 21.8 | 20 | 0 | 3 | 0 | 0 | 0 | 4 | 2 | 0 | 24.3 | 82 | 57 | 18 | |
| 第5半旬 | 21～25 | 22.1 | 24.7 | 26.7 | 24 | 22.3 | 23 | 20.6 | 20.0 | 23 | 21.3 | 25 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 25.2 | 95 | 75 | 21 | |
| 第6半旬 | 26～31 | 22.2 | 25.2 | 28.5 | 28 | 22.4 | 30 | 20.0 | 18.2 | 27 | 21.0 | 28 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 25.0 | 94 | 60 | 27 | |
| 第1半旬 | 1～ 5 | 24.4 | 28.2 | 30.4 | 05 | 24.1 | 02 | 22.1 | 21.6 | 02 | 23.1 | 05 | 0 | 2 | 0 | 0 | 0 | 4 | 2 | 0 | 28.3 | 93 | 69 | 05 | |
| 第2半旬 | 6～10 | 22.5 | 24.7 | 30.3 | 06 | 19.0 | 10 | 20.8 | 15.9 | 10 | 24.0 | 07 | 0 | 1 | 0 | 0 | 0 | 2 | 1 | 0 | 26.3 | 95 | 73 | 06 | |
| 第3半旬 | 11～15 | 17.8 | 20.0 | 21.5 | 11 | 18.5 | 14 | 16.3 | 15.8 | 14 | 17.1 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.3 | 80 | 66 | 11 | |
| 第4半旬 | 16～20 | 18.9 | 21.9 | 25.1 | 20* | 18.7 | 18 | 17.1 | 16.4 | 17 | 18.0 | 19 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 19.9 | 91 | 63 | 20 | |
| 第5半旬 | 21～25 | 19.3 | 20.6 | 23.0 | 21 | 20.0 | 25* | 18.3 | 17.8 | 22 | 18.6 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 21.9 | 98 | 79 | 21 | |
| 第6半旬 | 26～31 | 22.5 | 26.3 | 27.9 | 28 | 23.7 | 31 | 19.8 | 17.9 | 31 | 21.1 | 29 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 22.2 | 82 | 54 | 31 | |
| 第1半旬 | 1～ 5 | 19.7 | 23.2 | 25.1 | 01 | 21.9 | 05 | 17.0 | 15.5 | 02 | 18.3 | 04 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 18.5 | 81 | 60 | 01 | |
| 第2半旬 | 6～10 | 19.5 | 22.8 | 24.6 | 09 | 20.1 | 08 | 17.2 | 15.5 | 06 | 19.0 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.4 | 85 | 59 | 10 | |
| 第3半旬 | 11～15 | 18.3 | 22.2 | 24.1 | 12* | 20.1 | 15 | 15.1 | 12.7 | 14 | 17.9 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.8 | 79 | 49 | 14 | |
| 第4半旬 | 16～20 | 18.1 | 21.6 | 24.0 | 19 | 20.2 | 16 | 15.6 | 13.6 | 16 | 17.0 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.7 | 80 | 49 | 19 | |
| 第5半旬 | 21～25 | 17.9 | 21.3 | 23.1 | 23 | 19.6 | 25 | 15.1 | 11.2 | 25 | 18.8 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.1 | 86 | 52 | 25 | |
| 第6半旬 | 26～30 | 18.4 | 20.6 | 21.5 | 29 | 19.8 | 26 | 16.4 | 13.2 | 26 | 17.6 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.9 | 84 | 68 | 27* | |
| 第1半旬 | 1～ 5 | 17.5 | 21.3 | 24.6 | 04 | 19.4 | 05 | 14.5 | 11.5 | 05 | 18.7 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.9 | 84 | 45 | 03 | |
| 第2半旬 | 6～10 | 15.0 | 19.1 | 21.4 | 10 | 16.5 | 07 | 11.5 | 9.2 | 07 | 15.4 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.3 | 78 | 42 | 07 | |
| 第3半旬 | 11～15 | 14.9 | 18.6 | 21.6 | 11 | 17.4 | 14 | 11.0 | 9.4 | 15 | 13.0 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.0 | 76 | 50 | 12 | |
| 第4半旬 | 16～20 | 10.0 | 13.5 | 16.9 | 19 | 9.4 | 17 | 6.8 | 3.6 | 17 | 9.1 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.5 | 76 | 41 | 18 | |
| 第5半旬 | 21～25 | 10.1 | 13.6 | 17.2 | 25 | 10.8 | 23 | 6.6 | 4.6 | 23 | 10.0 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.3 | 75 | 49 | 24* | |
| 第6半旬 | 26～31 | 11.4 | 14.6 | 16.3 | 26 | 13.1 | 29 | 8.3 | 5.8 | 30 | 10.8 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.0 | 81 | 58 | 30 | |
| 第1半旬 | 1～ 5 | 11.3 | 14.5 | 16.0 | 05 | 12.2 | 02 | 8.7 | 7.9 | 05 | 9.6 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.6 | 80 | 52 | 01 | |
| 第2半旬 | 6～10 | 11.9 | 15.2 | 15.8 | 09* | 14.1 | 06 | 8.5 | 6.6 | 06 | 12.3 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.8 | 84 | 60 | 10 | |
| 第3半旬 | 11～15 | 9.4 | 12.0 | 13.3 | 14 | 11.4 | 15 | 6.9 | 5.7 | 15 | 8.2 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.2 | 69 | 44 | 15 | |
| 第4半旬 | 16～20 | 7.7 | 10.5 | 13.0 | 19 | 8.4 | 20 | 4.6 | 3.8 | 18 | 5.9 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.1 | 66 | 44 | 16 | |
| 第5半旬 | 21～25 | 5.8 | 8.3 | 14.1 | 22 | 4.0 | 24 | 3.1 | 1.2 | 23 | 6.6 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 75 | 51 | 23 | |
| 第6半旬 | 26～30 | 6.3 | 8.9 | 12.8 | 30 | 5.2 | 26 | 3.3 | 1.3 | 26 | 5.8 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 77 | 50 | 28 | |
| 第1半旬 | 1～ 5 | 3.5 | 6.8 | 13.3 | 01 | 2.5 | 05 | -0.2 | -2.0 | 05 | 3.8 | 03 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 6.4 | 77 | 53 | 05 | |
| 第2半旬 | 6～10 | 6.0 | 9.4 | 10.1 | 10* | 8.5 | 09* | 2.4 | 0.8 | 09 | 4.6 | 07 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 78 | 50 | 08 | |
| 第3半旬 | 11～15 | 4.1 | 6.5 | 10.8 | 11 | 1.8 | 13 | 1.4 | -2.8 | 13 | 5.4 | 11 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 6.5 | 78 | 53 | 15 | |
| 第4半旬 | 16～20 | -0.7 | 1.1 | 4.3 | 16 | -3.0 | 18 | -3.0 | -7.0 | 18 | 1.1 | 16 | 2 | 0 | 4 | 0 | 1 | 0 | 0 | 0 | 4.3 | 73 | 53 | 16 | |
| 第5半旬 | 21～25 | -1.9 | 0.4 | 5.3 | 21 | -3.4 | 25 | -4.5 | -8.4 | 25 | -0.6 | 21 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 4.1 | 74 | 52 | 21 | |
| 第6半旬 | 26～31 | -4.2 | -1.7 | 2.4 | 29 | -4.4 | 31 | -6.6 | -8.6 | 31 | -4.4 | 29 | 6 | 0 | 6 | 0 | 4 | 0 | 0 | 0 | 3.3 | 72 | 45 | 26 | |