月ごとの値
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室蘭（胆振地方) 1991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 | ||||||||||||||||||||||||||||
| 96.9 | 33 | 3 | 10 | 5.8 | 10 | 2 | 18* | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 07* | 20 | 12 | 0 | 0 | 0 | 0 | 0 | 7.7 | 0 | 13 | 28 | 0 | 0 | |
| 116.4 | 40 | 2 | 12 | 8.5 | 41 | 12 | 23 | 4 | 3 | 1 | 0 | 0 | 0 | 15 | 23 | 28 | 25 | 12 | 5 | 0 | 0 | 0 | 7.5 | 0 | 13 | 23 | 0 | 0 | |
| 159.2 | 43 | 5 | 18 | 12.4 | 17 | 7 | 09 | 3 | 1 | 0 | 0 | 0 | 0 | 12 | 10 | 14 | 10 | 3 | 1 | 0 | 0 | 0 | 6.9 | 2 | 13 | 22 | 2 | 0 | |
| 220.3 | 55 | 3 | 20 | 17.0 | 0 | 0 | 22* | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.7 | 4 | 5 | 4 | 3 | 1 | ||
| 266.8 | 59 | 5 | 22 | 20.9 | 0 | 0 | 03 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.5 | 5 | 7 | 0 | 5 | 0 | ||
| 160.9 | 35 | 5 | 13 | 17.9 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.9 | 1 | 17 | 0 | 12 | 0 | |||
| 119.0 | 26 | 10 | 10 | 14.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.5 | 0 | 21 | 0 | 2 | 0 | |||
| 159.6 | 37 | 7 | 14 | 15.6 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.2 | 3 | 18 | 0 | 6 | 0 | |||
| 203.7 | 54 | 4 | 20 | 14.7 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.9 | 1 | 10 | 0 | 2 | 3 | |||
| 118.3 | 35 | 6 | 14 | 8.5 | -- | -- | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.5 | 1 | 14 | 0 | 0 | 2 | |||
| 109.1 | 37 | 1 | 13 | 6.4 | 1 | 1 | 05 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 25 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 7.4 | 1 | 9 | 13 | 0 | 1 | |
| 71.9 | 26 | 5 | 8 | 4.5 | 11 | 8 | 28 | 1 | 1 | 0 | 0 | 0 | 0 | 9 | 29* | 16 | 11 | 4 | 0 | 0 | 0 | 0 | 7.7 | 1 | 16 | 21 | 0 | 0 | |