平年値（旬ごとの値）
 |
 |  |
 |  |  |  |
別海（根室地方) 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 | -5.9 | -0.5 | -12.3 | 2.1 | 45.5 | 26 | 26 |
| 中旬 | 10.9 | -7.2 | -1.6 | -13.9 | 2.1 | 48.2 | 25 | 32 | |
| 下旬 | 15.5 | -7.1 | -1.4 | -14.4 | 2.1 | 53.0 | 32 | 41 | |
| 2月 | 上旬 | 5.8 | -7.4 | -1.8 | -14.8 | 2.2 | 53.7 | 22 | 42 |
| 中旬 | 11.0 | -6.5 | -0.9 | -13.5 | 2.2 | 51.1 | 29 | 49 | |
| 下旬 | 10.7 | -5.3 | 0.3 | -12.7 | 2.2 | 45.6 | 21 | 50 | |
| 3月 | 上旬 | 20.0 | -3.9 | 1.1 | -10.3 | 2.3 | 57.4 | 30 | 53 |
| 中旬 | 12.3 | -1.7 | 3.1 | -7.4 | 2.3 | 58.3 | 21 | 44 | |
| 下旬 | 22.9 | -0.2 | 4.6 | -5.5 | 2.4 | 65.6 | 25 | 35 | |
| 4月 | 上旬 | 27.4 | 1.7 | 6.7 | -3.3 | 2.4 | 52.8 | 15 | 21 |
| 中旬 | 22.1 | 3.4 | 9.1 | -1.9 | 2.5 | 52.2 | 7 | 7 | |
| 下旬 | 29.6 | 5.7 | 12.2 | -0.3 | 2.7 | 58.6 | 4 | 3 | |
| 5月 | 上旬 | 38.6 | 7.3 | 13.6 | 1.5 | 2.6 | 54.4 | 1 | 0 |
| 中旬 | 32.2 | 8.5 | 14.7 | 2.9 | 2.5 | 54.4 | 1 | 0 | |
| 下旬 | 36.4 | 10.1 | 16.3 | 4.8 | 2.4 | 57.0 | 0 | 0 | |
| 6月 | 上旬 | 32.4 | 11.2 | 17.1 | 6.4 | 2.2 | 51.8 | 0 | 0 |
| 中旬 | 46.5 | 12.3 | 17.4 | 8.3 | 2.0 | 36.0 | 0 | 0 | |
| 下旬 | 32.5 | 13.4 | 18.9 | 9.1 | 2.0 | 44.2 | 0 | 0 | |
| 7月 | 上旬 | 37.0 | 14.9 | 20.1 | 10.9 | 1.8 | 38.8 | 0 | 0 |
| 中旬 | 42.5 | 16.0 | 21.0 | 12.2 | 1.8 | 35.0 | 0 | 0 | |
| 下旬 | 42.3 | 17.6 | 22.4 | 13.9 | 1.8 | 34.8 | 0 | 0 | |
| 8月 | 上旬 | 45.0 | 18.3 | 23.3 | 14.6 | 1.8 | 40.1 | 0 | 0 |
| 中旬 | 52.1 | 18.1 | 22.6 | 14.5 | 1.8 | 34.0 | 0 | 0 | |
| 下旬 | 57.8 | 17.8 | 22.6 | 13.9 | 1.8 | 44.6 | 0 | 0 | |
| 9月 | 上旬 | 51.5 | 17.4 | 22.2 | 13.1 | 1.8 | 41.9 | 0 | 0 |
| 中旬 | 75.9 | 15.7 | 21.0 | 10.8 | 1.8 | 45.7 | 0 | 0 | |
| 下旬 | 56.8 | 13.3 | 18.9 | 7.6 | 1.8 | 50.6 | 0 | 0 | |
| 10月 | 上旬 | 56.0 | 11.7 | 17.5 | 5.8 | 1.9 | 49.8 | 0 | 0 |
| 中旬 | 33.9 | 9.4 | 15.7 | 2.8 | 1.9 | 53.6 | 0 | 0 | |
| 下旬 | 36.0 | 7.6 | 13.6 | 1.3 | 2.0 | 54.6 | 0 | 0 | |
| 11月 | 上旬 | 25.6 | 5.5 | 11.5 | -0.8 | 2.2 | 49.9 | 0 | 0 |
| 中旬 | 28.0 | 2.8 | 8.5 | -3.1 | 2.1 | 47.4 | 2 | 1 | |
| 下旬 | 25.4 | 0.4 | 6.0 | -5.6 | 2.1 | 51.4 | 9 | 4 | |
| 12月 | 上旬 | 26.8 | -2.0 | 3.4 | -8.0 | 2.1 | 46.2 | 15 | 9 |
| 中旬 | 17.3 | -4.2 | 1.3 | -10.6 | 2.1 | 46.1 | 22 | 16 | |
| 下旬 | 19.7 | -5.1 | 0.2 | -11.6 | 2.1 | 52.0 | 29 | 22 | |