月ごとの値
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室蘭（胆振地方) 1997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 | ||||||||||||||
| -0.8 | 1.5 | 6.8 | 02 | -3.6 | 21 | -3.3 | -7.4 | 25 | 0.7 | 05 | 22 | 0 | 28 | 0 | 8 | 0 | 0 | 0 | 3.9 | 65 | 36 | 08 | |
| -0.6 | 1.5 | 7.7 | 25 | -1.3 | 22* | -2.7 | -5.0 | 15 | 2.4 | 25 | 22 | 0 | 25 | 0 | 6 | 0 | 0 | 0 | 4.1 | 69 | 34 | 20 | |
| 0.8 | 3.8 | 10.7 | 28 | -3.0 | 03 | -2.2 | -8.1 | 03 | 3.4 | 29 | 14 | 0 | 24 | 0 | 4 | 0 | 0 | 0 | 4.4 | 67 | 30 | 13 | |
| 6.4 | 10.6 | 21.2 | 28 | 4.7 | 05 | 3.3 | -0.4 | 16* | 9.5 | 28* | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 6.3 | 66 | 21 | 28 | |
| 9.5 | 13.5 | 20.8 | 28 | 8.2 | 22 | 6.8 | 3.2 | 01 | 9.5 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.1 | 78 | 22 | 03 | |
| 13.6 | 17.1 | 25.2 | 24 | 7.9 | 01 | 10.9 | 7.2 | 02* | 15.9 | 26 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 13.5 | 86 | 56 | 24 | |
| 19.4 | 22.9 | 28.3 | 13 | 18.7 | 02 | 17.0 | 14.0 | 09 | 20.3 | 27 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 18.8 | 83 | 45 | 13 | |
| 19.1 | 22.0 | 29.6 | 03 | 15.7 | 18 | 17.1 | 14.0 | 17* | 21.8 | 04 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 19.2 | 86 | 48 | 30 | |
| 16.9 | 19.6 | 25.0 | 05 | 14.3 | 24 | 14.4 | 9.5 | 23 | 19.6 | 01 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 15.2 | 78 | 35 | 12 | |
| 11.4 | 14.8 | 19.1 | 01 | 7.8 | 26 | 8.2 | 2.8 | 26 | 15.3 | 04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10.0 | 72 | 37 | 01 | |
| 8.0 | 10.9 | 15.4 | 27 | 6.3 | 19 | 5.3 | 0.7 | 30 | 9.2 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.9 | 71 | 37 | 09 | |
| 1.7 | 4.0 | 10.0 | 09 | -3.1 | 03 | -0.5 | -6.5 | 03 | 4.4 | 19 | 10 | 0 | 18 | 0 | 4 | 0 | 0 | 0 | 4.8 | 66 | 40 | 31 | |