月ごとの値
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室蘭（胆振地方) 1968年（月ごとの値） 詳細（気温・蒸気圧・湿度）
| 月 | 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 | ||||||||||||||
| -1.2 | 1.1 | 7.8 | 13 | -2.8 | 31 | -3.0 | -5.9 | 18 | 1.9 | 13 | 23 | 0 | 29 | 0 | 11 | 0 | 0 | 0 | 4.2 | 73 | 43 | 09 | |
| -2.3 | 0.1 | 3.7 | 05 | -4.1 | 01 | -4.9 | -8.8 | 01 | -0.7 | 05 | 26 | 0 | 29 | 0 | 12 | 0 | 0 | 0 | 3.7 | 70 | 31 | 25 | |
| 1.7 | 4.5 | 11.5 | 20 | -0.9 | 09 | -0.5 | -4.8 | 09 | 4.0 | 31 | 5 | 0 | 20 | 0 | 1 | 0 | 0 | 0 | 5.4 | 77 | 35 | 27* | |
| 5.6 | 8.9 | 17.8 | 22 | 4.7 | 09 | 3.2 | 0.2 | 12 | 6.9 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.6 | 73 | 24 | 22 | |
| 8.8 | 12.0 | 19.2 | 02 | 7.0 | 17 | 6.5 | 4.0 | 17 | 8.6 | 02 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.1 | 82 | 10 | 02 | |
| 13.2 | 16.2 | 23.2 | 29 | 10.2 | 03 | 10.6 | 5.9 | 02 | 14.7 | 27 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12.9 | 85 | 42 | 25 | |
| 18.6 | 21.4 | 27.0 | 24 | 16.0 | 06 | 16.3 | 11.0 | 04 | 21.5 | 21 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 18.9 | 87 | 43 | 16 | |
| 19.8 | 22.7 | 27.3 | 05 | 15.9 | 21 | 17.9 | 13.3 | 21 | 21.9 | 09 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 20.3 | 87 | 51 | 05 | |
| 17.7 | 20.1 | 23.2 | 02 | 17.3 | 26 | 15.5 | 10.4 | 10 | 17.9 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.5 | 80 | 43 | 24 | |
| 10.9 | 13.8 | 22.3 | 04 | 7.8 | 11 | 7.9 | 2.4 | 11 | 15.5 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.1 | 68 | 38 | 10 | |
| 7.9 | 10.6 | 17.1 | 03 | -0.3 | 28 | 5.4 | -3.4 | 28 | 13.0 | 06 | 2 | 0 | 4 | 0 | 1 | 0 | 0 | 0 | 8.1 | 72 | 41 | 16 | |
| 3.1 | 5.7 | 13.4 | 02 | -4.5 | 29 | 0.4 | -9.9 | 30 | 8.1 | 10 | 8 | 0 | 14 | 0 | 7 | 0 | 0 | 0 | 5.5 | 68 | 37 | 29 | |