平年値（旬ごとの値）
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幌糠（留萌地方) 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 | 56.6 | -5.5 | -1.8 | -10.4 | 1.8 | 8.8 | 101 | 129 |
| 中旬 | 51.1 | -7.1 | -2.6 | -12.8 | 1.6 | 14.2 | 93 | 156 | |
| 下旬 | 54.0 | -6.8 | -2.4 | -12.8 | 1.7 | 17.7 | 102 | 171 | |
| 2月 | 上旬 | 40.1 | -7.2 | -2.3 | -13.6 | 1.8 | 19.6 | 84 | 176 |
| 中旬 | 40.9 | -5.7 | -1.4 | -11.6 | 2.0 | 18.0 | 85 | 185 | |
| 下旬 | 26.7 | -5.0 | 0.3 | -12.0 | 1.9 | 22.4 | 56 | 184 | |
| 3月 | 上旬 | 32.7 | -3.9 | 0.8 | -10.2 | 2.1 | 29.3 | 65 | 184 |
| 中旬 | 27.8 | -1.6 | 2.9 | -7.3 | 2.2 | 36.3 | 47 | 175 | |
| 下旬 | 21.8 | -0.1 | 4.6 | -5.5 | 2.1 | 50.1 | 40 | 155 | |
| 4月 | 上旬 | 17.9 | 1.9 | 6.8 | -3.5 | 2.0 | 54.1 | 28 | 127 |
| 中旬 | 20.1 | 3.8 | 9.1 | -1.5 | 2.1 | 56.8 | 17 | 89 | |
| 下旬 | 19.1 | 6.1 | 12.4 | 0.0 | 2.2 | 57.3 | 8 | 44 | |
| 5月 | 上旬 | 26.5 | 8.6 | 14.9 | 2.3 | 2.3 | 60.9 | 2 | 11 |
| 中旬 | 21.5 | 10.8 | 17.0 | 4.5 | 2.3 | 62.3 | 0 | 0 | |
| 下旬 | 18.7 | 13.1 | 19.5 | 7.1 | 2.2 | 74.6 | 0 | 0 | |
| 6月 | 上旬 | 19.5 | 14.1 | 20.2 | 8.8 | 1.9 | 58.0 | 0 | 0 |
| 中旬 | 22.0 | 15.6 | 21.2 | 10.8 | 1.9 | 51.3 | 0 | 0 | |
| 下旬 | 18.3 | 16.9 | 22.5 | 12.1 | 1.8 | 57.8 | 0 | 0 | |
| 7月 | 上旬 | 32.4 | 18.4 | 23.8 | 13.8 | 1.6 | 54.3 | 0 | 0 |
| 中旬 | 35.2 | 19.3 | 24.6 | 15.0 | 1.7 | 54.5 | 0 | 0 | |
| 下旬 | 51.8 | 20.9 | 26.1 | 16.7 | 1.7 | 53.0 | 0 | 0 | |
| 8月 | 上旬 | 40.3 | 21.1 | 26.4 | 16.8 | 1.6 | 57.2 | 0 | 0 |
| 中旬 | 44.7 | 20.4 | 25.7 | 16.1 | 1.5 | 48.4 | 0 | 0 | |
| 下旬 | 50.4 | 19.4 | 25.1 | 14.6 | 1.5 | 58.4 | 0 | 0 | |
| 9月 | 上旬 | 62.3 | 18.2 | 24.1 | 13.1 | 1.5 | 56.5 | 0 | 0 |
| 中旬 | 51.3 | 15.7 | 21.7 | 10.4 | 1.4 | 50.9 | 0 | 0 | |
| 下旬 | 48.8 | 13.2 | 19.7 | 7.5 | 1.4 | 51.3 | 0 | 0 | |
| 10月 | 上旬 | 51.7 | 11.2 | 17.4 | 5.7 | 1.5 | 44.1 | 0 | 0 |
| 中旬 | 48.0 | 9.0 | 15.0 | 3.4 | 1.6 | 39.8 | 0 | 0 | |
| 下旬 | 60.9 | 7.2 | 12.8 | 2.1 | 1.8 | 37.5 | 0 | 0 | |
| 11月 | 上旬 | 60.4 | 5.1 | 9.9 | 0.5 | 1.9 | 23.3 | 9 | 5 |
| 中旬 | 71.1 | 2.1 | 6.2 | -1.5 | 1.7 | 16.1 | 38 | 21 | |
| 下旬 | 71.3 | 0.1 | 3.7 | -3.2 | 1.9 | 13.9 | 59 | 36 | |
| 12月 | 上旬 | 64.8 | -2.0 | 1.2 | -5.4 | 1.9 | 8.6 | 83 | 58 |
| 中旬 | 68.2 | -3.8 | -0.5 | -7.8 | 1.8 | 8.0 | 100 | 88 | |
| 下旬 | 62.5 | -4.9 | -1.1 | -9.5 | 1.8 | 11.0 | 107 | 110 | |