月ごとの値
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室蘭（胆振地方) 1983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 | ||||||||||||||
| -1.3 | 0.8 | 8.7 | 08 | -5.0 | 09 | -3.6 | -7.2 | 10* | 3.6 | 28 | 23 | 0 | 29 | 0 | 15 | 0 | 0 | 0 | 3.7 | 64 | 36 | 22 | |
| -3.2 | -1.3 | 2.3 | 15 | -6.2 | 12 | -5.3 | -8.9 | 12 | -1.3 | 05 | 28 | 0 | 28 | 0 | 19 | 0 | 0 | 0 | 3.5 | 71 | 43 | 28 | |
| 1.0 | 4.0 | 10.9 | 30 | -1.6 | 02 | -1.6 | -5.5 | 05 | 2.7 | 30 | 12 | 0 | 23 | 0 | 3 | 0 | 0 | 0 | 4.7 | 70 | 35 | 02 | |
| 7.4 | 11.1 | 19.4 | 28 | 4.6 | 09 | 4.4 | 1.5 | 09 | 8.5 | 25* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.0 | 69 | 23 | 07 | |
| 10.9 | 15.4 | 23.8 | 12 | 8.7 | 25 | 7.8 | 4.5 | 10 | 12.0 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9.9 | 75 | 28 | 15 | |
| 11.2 | 13.9 | 21.5 | 08 | 9.8 | 27 | 9.4 | 5.7 | 03 | 11.4 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11.7 | 88 | 39 | 04 | |
| 15.5 | 18.2 | 24.1 | 24 | 11.9 | 03 | 13.7 | 9.5 | 03 | 17.4 | 24* | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15.6 | 88 | 62 | 14 | |
| 20.6 | 23.2 | 30.2 | 06 | 17.9 | 02 | 18.8 | 15.9 | 23 | 22.1 | 08 | 0 | 1 | 0 | 0 | 0 | 6 | 1 | 0 | 21.5 | 88 | 61 | 06 | |
| 17.6 | 20.5 | 27.3 | 05 | 16.6 | 16 | 15.1 | 8.9 | 29 | 21.4 | 04 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 16.2 | 78 | 38 | 28 | |
| 10.6 | 13.3 | 18.7 | 10 | 6.9 | 29 | 7.5 | 1.0 | 30 | 14.2 | 01 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.6 | 65 | 35 | 14 | |
| 6.2 | 8.8 | 13.4 | 10 | -0.5 | 26 | 3.2 | -4.4 | 26 | 10.2 | 11 | 2 | 0 | 7 | 0 | 1 | 0 | 0 | 0 | 6.9 | 70 | 41 | 04* | |
| -0.4 | 1.8 | 8.5 | 02 | -4.4 | 16 | -2.9 | -6.6 | 17 | 2.2 | 11 | 17 | 0 | 25 | 0 | 8 | 0 | 0 | 0 | 4.1 | 66 | 41 | 29 | |