月ごとの値
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室蘭（胆振地方) 1978年（月ごとの値） 詳細（日照・雪・その他）
| 月 | 日照時間(h) | 全天日射量 (MJ/㎡) | 雪(cm) | 雲量 | 大気現象 | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 合計 | 日照率 | 各階級の日数 | 降雪 | 各階級の日数（降雪） | 最深積雪 | 各階級の日数（最深積雪） | 平均 | 各階級の日数 | 雪日数 | 霧日数 | 雷日数 | ||||||||||||||||||
| 不照 | 日照率 ≧40% | 平均 | 合計 | 日合計の最大 | ≧3cm | ≧5cm | ≧10cm | ≧20cm | ≧50cm | ≧100cm | 値 | 日 | ≧0cm | ≧1cm | ≧5cm | ≧10cm | ≧20cm | ≧50cm | ≧100cm | ＜1.5 | ≧8.5 | ||||||||
| 値 | 日 | ||||||||||||||||||||||||||||
| 81.3 | 28 | 2 | 7 | 5.0 | 25 | 10 | 25 | 2 | 1 | 1 | 0 | 0 | 0 | 13 | 30* | 27 | 20 | 10 | 7 | 0 | 0 | 0 | 7.9 | 0 | 13 | 30 | 0 | 1 | |
| 125.8 | 43 | 3 | 14 | 8.8 | 36 | 17 | 18 | 4 | 3 | 1 | 0 | 0 | 0 | 22 | 18 | 28 | 28 | 23 | 9 | 1 | 0 | 0 | 7.6 | 0 | 12 | 26 | 0 | 0 | |
| 222.0 | 60 | 2 | 23 | 14.7 | 56 | 34 | 11 | 3 | 3 | 2 | 1 | 0 | 0 | 51 | 11 | 29 | 28 | 26 | 25 | 16 | 1 | 0 | 5.1 | 6 | 6 | 20 | 0 | 0 | |
| 153.8 | 39 | 9 | 14 | 13.3 | 1 | 1 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 03 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 6.9 | 0 | 12 | 6 | 5 | 0 | |
| 203.0 | 45 | 8 | 17 | 17.6 ) | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 2 | 14 | 0 | 8 | 2 | |||
| 184.1 | 40 | 7 | 15 | 17.0 ) | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.5 | 1 | 17 | 0 | 11 | 1 | |||
| 181.8 | 39 | 6 | 18 | 17.7 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.4 | 1 | 15 | 0 | 19 | 0 | |||
| 229.8 | 54 | 4 | 21 | 17.2 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.5 | 3 | 10 | 0 | 5 | 1 | |||
| 219.2 | 59 | 4 | 21 | 14.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.4 | 4 | 8 | 0 | 0 | 2 | |||
| 187.4 | 55 | 2 | 21 | 10.5 | 0 | 0 | 13* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.8 | 1 | 6 | 1 | 0 | 2 | ||
| 135.6 | 46 | 5 | 17 | 6.9 | 0 | 0 | 24* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.5 | 3 | 10 | 5 | 0 | 0 | ||
| 79.9 | 28 | 4 | 9 | 4.4 | 28 | 14 | 19 | 2 | 2 | 1 | 0 | 0 | 0 | 16 | 19 | 17 | 12 | 6 | 3 | 0 | 0 | 0 | 7.1 | 1 | 12 | 16 | 0 | 0 | |