月ごとの値
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室蘭（胆振地方) 1964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 | 0.9 | 8.4 | 13 | -3.5 | 02 | -3.6 | -6.2 | 21* | 3.4 | 13 | 25 | 0 | 30 | 0 | 9 | 0 | 0 | 0 | 3.9 | 68 | 42 | 28 | |
| -3.4 | -1.4 | 0.8 | 26 | -3.3 | 18* | -5.7 | -9.5 | 18 | -2.1 | 26 | 29 | 0 | 29 | 0 | 26 | 0 | 0 | 0 | 3.4 | 70 | 37 | 02 | |
| 1.0 | 3.5 | 11.1 | 31 | -1.3 | 01 | -1.4 | -5.8 | 22 | 3.3 | 31 | 9 | 0 | 24 | 0 | 1 | 0 | 0 | 0 | 4.9 | 74 | 41 | 27 | |
| 5.4 | 8.5 | 17.6 | 14 | 1.4 | 08 | 2.7 | -3.1 | 08 | 5.9 | 15 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 6.9 | 76 | 23 | 12 | |
| 10.8 | 14.3 | 19.8 | 15 | 9.2 | 02 | 8.0 | 4.9 | 01 | 10.9 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.9 | 78 | 13 | 15 | |
| 14.4 | 17.5 | 25.1 | 26 | 12.4 | 14 | 11.9 | 9.2 | 12 | 16.1 | 27 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 14.3 | 87 | 50 | 06 | |
| 17.4 | 20.1 | 26.6 | 25 | 13.2 | 10 | 15.4 | 11.9 | 18 | 19.1 | 24 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 17.6 | 89 | 48 | 25 | |
| 19.9 | 22.2 | 27.8 | 03 | 17.8 | 28 | 18.0 | 14.3 | 10 | 23.0 | 16 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 21.2 | 91 | 52 | 09 | |
| 16.8 | 19.4 | 25.3 | 01 | 13.7 | 28 | 14.1 | 7.9 | 27 | 19.8 | 01 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 14.6 | 74 | 40 | 27 | |
| 11.4 | 14.4 | 19.4 | 01 | 6.4 | 24 | 8.3 | -1.0 | 25 | 13.5 | 21 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 9.8 | 70 | 39 | 22 | |
| 5.9 | 8.0 | 13.6 | 01 | 3.2 | 30 | 3.3 | -4.7 | 22 | 9.6 | 01 | 1 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 6.6 | 69 | 42 | 10 | |
| 0.5 | 2.8 | 9.4 | 23 | -2.3 | 12 | -2.0 | -5.8 | 12 | 3.8 | 24 | 14 | 0 | 26 | 0 | 7 | 0 | 0 | 0 | 4.7 | 71 | 34 | 20 | |