半旬ごとの値
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室蘭（胆振地方) 1987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 | -4.4 | -1.3 | 3.2 | 03 | -5.1 | 02 | -7.1 | -7.9 | 02 | -6.1 | 03 | 5 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 3.5 | 74 | 53 | 05 | |
| 第2半旬 | 6～10 | -3.6 | -1.0 | 3.7 | 08 | -3.4 | 10 | -5.6 | -7.0 | 09 | -2.6 | 08 | 4 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 3.4 | 71 | 54 | 07* | |
| 第3半旬 | 11～15 | -4.2 | -2.5 | -1.0 | 13 | -3.6 | 12 | -6.6 | -8.4 | 11 | -4.6 | 13 | 5 | 0 | 5 | 0 | 5 | 0 | 0 | 0 | 3.2 | 70 | 41 | 11 | |
| 第4半旬 | 16～20 | -2.4 | -0.5 | 5.6 | 17 | -5.3 | 20 | -4.4 | -7.4 | 20 | -1.2 | 17 | 3 | 0 | 5 | 0 | 3 | 0 | 0 | 0 | 3.9 | 73 | 43 | 19 | |
| 第5半旬 | 21～25 | -2.0 | 0.0 | 4.4 | 23 | -3.3 | 21 | -4.9 | -7.6 | 21 | -2.3 | 23 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 3.9 | 70 | 39 | 25 | |
| 第6半旬 | 26～31 | -2.1 | 0.0 | 3.4 | 29 | -3.8 | 31 | -4.0 | -7.2 | 31 | -0.2 | 29 | 4 | 0 | 6 | 0 | 3 | 0 | 0 | 0 | 3.5 | 65 | 52 | 31* | |
| 第1半旬 | 1～ 5 | -3.6 | -1.7 | 0.6 | 05 | -4.9 | 01 | -5.7 | -7.5 | 02 | -3.9 | 05 | 5 | 0 | 5 | 0 | 4 | 0 | 0 | 0 | 2.7 | 57 | 28 | 03 | |
| 第2半旬 | 6～10 | 0.5 | 2.8 | 5.4 | 10 | 0.5 | 06 | -2.1 | -3.4 | 09* | 0.6 | 10 | 2 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4.3 | 66 | 36 | 10 | |
| 第3半旬 | 11～15 | -4.2 | -1.5 | 4.0 | 11 | -7.0 | 15 | -5.9 | -9.4 | 15 | 1.7 | 11 | 4 | 0 | 4 | 0 | 3 | 0 | 0 | 0 | 3.4 | 70 | 48 | 13 | |
| 第4半旬 | 16～20 | -5.1 | -3.2 | -1.6 | 18 | -6.2 | 16 | -6.9 | -9.0 | 16 | -6.2 | 19* | 5 | 0 | 5 | 0 | 5 | 0 | 0 | 0 | 2.8 | 65 | 48 | 18 | |
| 第5半旬 | 21～25 | -0.1 | 1.9 | 3.9 | 23 | -0.9 | 21 | -2.6 | -5.3 | 21 | -1.0 | 23 | 2 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 4.5 | 73 | 45 | 21 | |
| 第6半旬 | 26～28 | -3.1 | -1.2 | 0.4 | 28 | -2.0 | 27 | -4.6 | -5.1 | 28 | -3.6 | 27 | 3 | 0 | 3 | 0 | 2 | 0 | 0 | 0 | 3.7 | 75 | 53 | 28 | |
| 第1半旬 | 1～ 5 | -0.8 | 1.5 | 4.2 | 05 | 0.4 | 04 | -3.0 | -3.4 | 01 | -2.1 | 03 | 4 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 4.0 | 69 | 44 | 03 | |
| 第2半旬 | 6～10 | -2.0 | 0.4 | 1.9 | 09 | -2.9 | 06 | -3.7 | -6.2 | 06 | -2.3 | 09 | 5 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 3.4 | 64 | 48 | 06 | |
| 第3半旬 | 11～15 | 0.1 | 2.7 | 4.2 | 14 | -0.2 | 15 | -2.3 | -4.6 | 15 | -0.4 | 14 | 2 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 4.6 | 73 | 38 | 15 | |
| 第4半旬 | 16～20 | 1.0 | 4.0 | 6.1 | 19 | 0.8 | 16 | -1.0 | -3.4 | 16 | 0.4 | 20 | 1 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 4.6 | 68 | 37 | 16 | |
| 第5半旬 | 21～25 | 2.4 | 5.0 | 6.1 | 22 | 3.4 | 23 | 0.8 | -0.3 | 25 | 2.2 | 24 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 6.3 | 87 | 54 | 22 | |
| 第6半旬 | 26～31 | 1.2 | 3.8 | 9.3 | 29 | -0.1 | 31 | -1.2 | -3.9 | 31 | 2.6 | 29 | 2 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 4.6 | 67 | 42 | 31 | |
| 第1半旬 | 1～ 5 | 4.0 | 7.8 | 9.7 | 05 | 4.2 | 01 | 0.9 | -2.4 | 01 | 2.4 | 02 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 5.3 | 64 | 33 | 05* | |
| 第2半旬 | 6～10 | 4.8 | 8.5 | 10.8 | 09 | 4.6 | 07 | 2.2 | 0.9 | 07 | 3.7 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 78 | 31 | 06 | |
| 第3半旬 | 11～15 | 2.2 | 5.2 | 9.7 | 15 | 1.9 | 12 | -0.2 | -1.7 | 13 | 1.9 | 15 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 4.9 | 69 | 31 | 15 | |
| 第4半旬 | 16～20 | 7.3 | 13.1 | 15.2 | 19 | 9.5 | 20 | 2.2 | 0.9 | 16 | 3.8 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.6 | 66 | 24 | 16 | |
| 第5半旬 | 21～25 | 5.1 | 8.6 | 11.5 | 21 | 4.0 | 25 | 2.3 | 1.3 | 25 | 4.1 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 77 | 37 | 23 | |
| 第6半旬 | 26～30 | 6.9 | 11.5 | 19.0 | 30 | 5.6 | 26 | 2.4 | 0.9 | 27* | 4.1 | 28 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.4 | 66 | 29 | 30 | |
| 第1半旬 | 1～ 5 | 9.2 | 13.5 | 19.4 | 02 | 9.4 | 05* | 6.1 | 3.0 | 04 | 11.5 | 01 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.7 | 73 | 29 | 02 | |
| 第2半旬 | 6～10 | 10.8 | 16.7 | 23.5 | 09 | 10.3 | 06 | 5.2 | 2.5 | 07 | 9.9 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.1 | 60 | 19 | 09 | |
| 第3半旬 | 11～15 | 10.6 | 15.2 | 19.6 | 11 | 10.3 | 15 | 6.9 | 5.2 | 15 | 9.5 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.6 | 74 | 32 | 14 | |
| 第4半旬 | 16～20 | 11.2 | 16.7 | 21.0 | 20 | 11.6 | 17 | 7.2 | 3.3 | 16 | 9.1 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.6 | 75 | 39 | 19 | |
| 第5半旬 | 21～25 | 10.2 | 14.3 | 19.2 | 22 | 8.8 | 24 | 7.7 | 6.2 | 24 | 9.4 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.5 | 83 | 48 | 21 | |
| 第6半旬 | 26～31 | 11.8 | 17.0 | 21.7 | 31 | 13.1 | 28 | 7.6 | 4.8 | 28 | 10.0 | 31 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.6 | 77 | 35 | 31 | |
| 第1半旬 | 1～ 5 | 16.4 | 21.3 | 24.1 | 04 | 16.0 | 03 | 11.7 | 10.1 | 01 | 13.4 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.3 | 73 | 28 | 01 | |
| 第2半旬 | 6～10 | 16.6 | 20.7 | 26.1 | 07 | 15.5 | 09 | 13.1 | 11.5 | 10 | 15.9 | 07 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 15.1 | 81 | 49 | 07 | |
| 第3半旬 | 11～15 | 13.0 | 17.0 | 19.3 | 15 | 12.9 | 12 | 10.7 | 10.2 | 15 | 11.5 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.2 | 89 | 48 | 15 | |
| 第4半旬 | 16～20 | 14.6 | 17.8 | 18.7 | 18 | 17.1 | 20* | 12.6 | 11.5 | 16 | 13.5 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14.6 | 88 | 67 | 16 | |
| 第5半旬 | 21～25 | 17.7 | 21.8 | 24.5 | 24 | 19.7 | 25 | 14.8 | 13.9 | 21 | 16.7 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.5 | 82 | 53 | 22 | |
| 第6半旬 | 26～30 | 15.7 | 18.9 | 26.9 | 26 | 14.3 | 29 | 13.4 | 12.9 | 29 | 14.7 | 26 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 14.6 | 82 | 42 | 26 | |
| 第1半旬 | 1～ 5 | 17.4 | 21.2 | 23.7 | 02 | 17.0 | 01 | 14.6 | 13.7 | 01 | 15.2 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.2 | 83 | 42 | 03 | |
| 第2半旬 | 6～10 | 17.4 | 20.4 | 23.9 | 08 | 15.5 | 06 | 15.4 | 14.7 | 06 | 16.1 | 09 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.9 | 90 | 64 | 08 | |
| 第3半旬 | 11～15 | 18.1 | 21.8 | 24.5 | 15 | 19.7 | 13 | 16.3 | 16.0 | 12 | 16.7 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.4 | 89 | 68 | 11 | |
| 第4半旬 | 16～20 | 18.3 | 21.0 | 26.3 | 19 | 17.4 | 17 | 16.2 | 15.2 | 20 | 18.8 | 19 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 18.7 | 90 | 59 | 19 | |
| 第5半旬 | 21～25 | 19.6 | 22.3 | 26.3 | 24 | 17.1 | 21 | 17.9 | 14.9 | 21 | 20.2 | 25 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 20.7 | 91 | 67 | 25 | |
| 第6半旬 | 26～31 | 21.4 | 25.2 | 28.1 | 28 | 20.8 | 31 | 19.0 | 16.0 | 31 | 20.0 | 30 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 20.8 | 81 | 55 | 28 | |
| 第1半旬 | 1～ 5 | 16.5 | 17.5 | 18.6 | 04 | 16.7 | 02* | 15.4 | 14.2 | 02 | 16.6 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.3 | 92 | 79 | 01 | |
| 第2半旬 | 6～10 | 19.3 | 21.9 | 24.8 | 09 | 18.0 | 08 | 17.3 | 16.2 | 07 | 18.1 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19.5 | 87 | 65 | 09 | |
| 第3半旬 | 11～15 | 20.6 | 23.8 | 25.6 | 14 | 22.0 | 11 | 18.8 | 18.1 | 13 | 19.5 | 14 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 21.2 | 88 | 62 | 15 | |
| 第4半旬 | 16～20 | 19.1 | 21.1 | 23.1 | 20 | 19.8 | 19 | 17.8 | 17.0 | 19 | 18.9 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20.0 | 91 | 78 | 17 | |
| 第5半旬 | 21～25 | 19.2 | 21.8 | 24.4 | 21 | 17.9 | 23 | 17.7 | 16.1 | 23 | 19.3 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20.6 | 92 | 76 | 21 | |
| 第6半旬 | 26～31 | 19.5 | 21.5 | 25.0 | 31 | 19.4 | 28 | 18.5 | 17.7 | 28 | 19.6 | 31 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 21.1 | 94 | 64 | 31 | |
| 第1半旬 | 1～ 5 | 19.0 | 22.3 | 24.3 | 01 | 21.1 | 05 | 16.9 | 15.9 | 02 | 17.6 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18.4 | 83 | 51 | 02 | |
| 第2半旬 | 6～10 | 20.1 | 21.7 | 22.9 | 09 | 20.9 | 07 | 19.0 | 16.5 | 10 | 20.2 | 08* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 21.9 | 93 | 63 | 09 | |
| 第3半旬 | 11～15 | 19.4 | 22.9 | 23.4 | 15 | 22.6 | 12 | 16.7 | 13.6 | 12 | 18.8 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17.4 | 77 | 52 | 12 | |
| 第4半旬 | 16～20 | 16.4 | 19.3 | 21.2 | 16 | 17.2 | 17 | 13.8 | 12.2 | 20 | 16.0 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.9 | 69 | 50 | 16 | |
| 第5半旬 | 21～25 | 18.2 | 21.2 | 22.0 | 24* | 19.8 | 25 | 14.9 | 12.6 | 23 | 16.8 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.8 | 75 | 39 | 22 | |
| 第6半旬 | 26～30 | 15.5 | 19.0 | 20.7 | 26 | 17.7 | 27 | 12.6 | 10.7 | 29 | 15.6 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.7 | 65 | 37 | 29 | |
| 第1半旬 | 1～ 5 | 16.6 | 20.0 | 23.2 | 05 | 18.8 | 01 | 13.9 | 13.3 | 03 | 14.7 | 02 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13.8 | 72 | 53 | 01 | |
| 第2半旬 | 6～10 | 14.7 | 18.5 | 23.0 | 07 | 15.7 | 09 | 11.0 | 7.6 | 09 | 15.4 | 07 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.4 | 69 | 40 | 09 | |
| 第3半旬 | 11～15 | 12.5 | 16.2 | 21.1 | 11 | 13.3 | 14 | 9.0 | 6.4 | 15 | 14.1 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.5 | 68 | 40 | 13 | |
| 第4半旬 | 16～20 | 13.2 | 15.5 | 18.7 | 18 | 11.7 | 20 | 9.7 | 5.8 | 20 | 14.2 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.0 | 76 | 49 | 20 | |
| 第5半旬 | 21～25 | 8.8 | 10.7 | 13.9 | 24 | 8.2 | 21 | 6.2 | 5.0 | 21 | 7.2 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 59 | 42 | 24* | |
| 第6半旬 | 26～31 | 11.5 | 15.2 | 19.5 | 29 | 8.6 | 31 | 8.2 | 4.4 | 31 | 12.3 | 28 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.7 | 61 | 35 | 28 | |
| 第1半旬 | 1～ 5 | 9.6 | 11.6 | 12.7 | 05 | 9.5 | 01 | 7.4 | 4.9 | 01 | 8.8 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.0 | 74 | 48 | 01 | |
| 第2半旬 | 6～10 | 8.0 | 11.1 | 13.2 | 10 | 8.6 | 09 | 4.5 | 3.5 | 09 | 6.0 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.7 | 70 | 49 | 08* | |
| 第3半旬 | 11～15 | 6.5 | 10.0 | 15.2 | 12 | 6.5 | 13 | 3.1 | -0.3 | 14 | 7.2 | 11 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 6.3 | 61 | 36 | 11 | |
| 第4半旬 | 16～20 | 4.9 | 9.2 | 12.3 | 16 | 2.6 | 20 | 2.0 | -1.8 | 19 | 7.3 | 16 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 6.2 | 67 | 45 | 19 | |
| 第5半旬 | 21～25 | 1.9 | 5.8 | 10.4 | 21 | 1.3 | 25 | -0.6 | -2.6 | 24 | 1.1 | 21 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 4.7 | 63 | 45 | 22 | |
| 第6半旬 | 26～30 | -2.4 | -0.6 | 2.6 | 26 | -4.0 | 28 | -4.2 | -6.4 | 28 | -0.7 | 26 | 4 | 0 | 5 | 0 | 3 | 0 | 0 | 0 | 3.3 | 63 | 47 | 30* | |
| 第1半旬 | 1～ 5 | -1.9 | -0.5 | 1.6 | 02 | -3.3 | 05 | -3.4 | -5.9 | 05 | -1.9 | 02 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 3.8 | 71 | 49 | 01 | |
| 第2半旬 | 6～10 | 2.1 | 4.4 | 8.6 | 10 | -2.0 | 06 | -0.7 | -4.7 | 06 | 2.2 | 08 | 1 | 0 | 2 | 0 | 1 | 0 | 0 | 0 | 4.7 | 64 | 48 | 06 | |
| 第3半旬 | 11～15 | -0.7 | 2.2 | 8.7 | 11 | -2.0 | 14 | -3.1 | -5.1 | 14 | -0.9 | 11 | 4 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 3.7 | 61 | 43 | 13 | |
| 第4半旬 | 16～20 | -2.0 | 1.1 | 4.6 | 16 | -2.0 | 17 | -5.5 | -9.5 | 17 | -3.2 | 16 | 4 | 0 | 5 | 0 | 1 | 0 | 0 | 0 | 3.8 | 69 | 48 | 20 | |
| 第5半旬 | 21～25 | -0.4 | 1.7 | 7.5 | 24 | -2.2 | 22* | -2.8 | -5.1 | 21 | -0.3 | 25 | 3 | 0 | 5 | 0 | 2 | 0 | 0 | 0 | 4.2 | 69 | 47 | 25* | |
| 第6半旬 | 26～31 | 0.6 | 3.9 | 8.8 | 27 | -4.2 | 31 | -2.4 | -10.2 | 31 | 4.0 | 27 | 2 | 0 | 3 | 0 | 2 | 0 | 0 | 0 | 5.1 | 71 | 39 | 29 | |