平年値（旬ごとの値）
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白老（胆振地方) 平年値（旬ごとの値）
| 要素 | 降水量 (mm) | 平均気温 (℃) | 日最高気温 (℃) | 日最低気温 (℃) | 平均風速 (m/s) | 日照時間 (h) | 降雪の深さ合計 (cm) | 最深積雪 (cm) | |
|---|---|---|---|---|---|---|---|---|---|
| 統計期間 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 1月 | 上旬 | 11.8 | -3.0 | 1.1 | -7.6 | 2.7 | 49.2 | 18 | 8 |
| 中旬 | 8.7 | -4.1 | 0.2 | -9.1 | 2.4 | 49.3 | 22 | 13 | |
| 下旬 | 13.6 | -4.0 | 0.2 | -9.0 | 2.7 | 54.8 | 28 | 16 | |
| 2月 | 上旬 | 8.4 | -4.2 | 0.1 | -9.4 | 2.5 | 52.9 | 27 | 18 |
| 中旬 | 12.0 | -3.2 | 0.9 | -8.3 | 2.7 | 55.0 | 26 | 21 | |
| 下旬 | 15.5 | -2.4 | 1.9 | -7.5 | 2.5 | 47.4 | 22 | 20 | |
| 3月 | 上旬 | 25.2 | -1.4 | 2.5 | -6.0 | 2.8 | 55.9 | 26 | 17 |
| 中旬 | 15.3 | 0.3 | 4.3 | -4.2 | 2.6 | 54.7 | 17 | 10 | |
| 下旬 | 20.8 | 1.6 | 6.0 | -3.0 | 2.5 | 68.2 | 12 | 5 | |
| 4月 | 上旬 | 20.9 | 3.5 | 8.0 | -1.3 | 2.5 | 60.3 | 4 | 2 |
| 中旬 | 33.6 | 4.8 | 9.2 | 0.1 | 2.5 | 60.7 | 1 | 1 | |
| 下旬 | 34.8 | 6.6 | 11.3 | 1.9 | 2.4 | 64.2 | 1 | 0 | |
| 5月 | 上旬 | 56.3 | 8.2 | 12.8 | 3.8 | 2.2 | 61.9 | 0 | 0 |
| 中旬 | 49.9 | 9.5 | 13.7 | 5.6 | 2.1 | 58.4 | 0 | 0 | |
| 下旬 | 49.5 | 11.1 | 15.2 | 7.4 | 1.9 | 62.7 | 0 | 0 | |
| 6月 | 上旬 | 45.4 | 12.3 | 15.8 | 9.2 | 1.8 | 45.7 | 0 | 0 |
| 中旬 | 56.9 | 13.8 | 17.1 | 10.8 | 1.7 | 39.2 | 0 | 0 | |
| 下旬 | 46.9 | 15.2 | 18.6 | 12.3 | 1.8 | 44.9 | 0 | 0 | |
| 7月 | 上旬 | 69.3 | 16.6 | 19.8 | 14.0 | 1.7 | 37.7 | 0 | 0 |
| 中旬 | 56.7 | 17.8 | 20.9 | 15.3 | 1.7 | 35.0 | 0 | 0 | |
| 下旬 | 81.8 | 19.2 | 22.1 | 16.8 | 1.6 | 36.1 | 0 | 0 | |
| 8月 | 上旬 | 62.2 | 20.2 | 23.4 | 17.7 | 1.7 | 41.2 | 0 | 0 |
| 中旬 | 79.0 | 20.1 | 23.3 | 17.5 | 1.9 | 37.5 | 0 | 0 | |
| 下旬 | 89.3 | 19.7 | 23.3 | 16.3 | 2.2 | 52.9 | 0 | 0 | |
| 9月 | 上旬 | 67.4 | 19.1 | 22.9 | 15.3 | 2.3 | 50.4 | 0 | 0 |
| 中旬 | 64.5 | 17.3 | 21.7 | 12.9 | 2.3 | 51.8 | 0 | 0 | |
| 下旬 | 75.0 | 15.2 | 20.1 | 10.3 | 2.6 | 56.3 | 0 | 0 | |
| 10月 | 上旬 | 55.4 | 13.3 | 18.3 | 8.2 | 2.7 | 51.9 | 0 | 0 |
| 中旬 | 42.3 | 10.8 | 16.2 | 5.3 | 2.6 | 55.3 | 0 | 0 | |
| 下旬 | 36.7 | 9.2 | 14.2 | 3.9 | 2.8 | 53.1 | 0 | 0 | |
| 11月 | 上旬 | 29.9 | 7.1 | 11.9 | 1.9 | 2.8 | 49.6 | 0 | 0 |
| 中旬 | 29.1 | 4.4 | 9.0 | -0.4 | 2.8 | 45.2 | 1 | 0 | |
| 下旬 | 30.5 | 2.2 | 6.6 | -2.3 | 2.8 | 45.3 | 3 | 2 | |
| 12月 | 上旬 | 23.2 | 0.0 | 4.1 | -4.3 | 2.8 | 44.3 | 8 | 5 |
| 中旬 | 17.8 | -1.7 | 2.3 | -6.3 | 2.7 | 45.2 | 14 | 6 | |
| 下旬 | 15.8 | -2.2 | 1.8 | -6.8 | 2.6 | 47.1 | 17 | 7 | |