平年値（旬ごとの値）
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二戸（岩手県) 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 | 14.7 | -1.7 | 2.0 | -5.6 | 1.9 | 29.1 | 26 | 13 |
| 中旬 | 11.1 | -2.5 | 1.5 | -6.9 | 1.8 | 30.2 | 31 | 18 | |
| 下旬 | 13.9 | -2.6 | 1.6 | -7.1 | 1.9 | 39.6 | 37 | 22 | |
| 2月 | 上旬 | 13.6 | -2.4 | 1.8 | -7.1 | 1.9 | 35.8 | 39 | 25 |
| 中旬 | 16.4 | -1.7 | 2.5 | -6.2 | 2.1 | 38.3 | 34 | 28 | |
| 下旬 | 9.4 | -0.6 | 4.2 | -5.6 | 2.0 | 37.4 | 20 | 20 | |
| 3月 | 上旬 | 17.5 | 0.3 | 5.0 | -4.3 | 2.2 | 44.6 | 22 | 17 |
| 中旬 | 17.3 | 2.0 | 7.1 | -3.1 | 2.4 | 50.5 | 12 | 12 | |
| 下旬 | 18.1 | 3.4 | 8.9 | -2.0 | 2.4 | 61.7 | 8 | 8 | |
| 4月 | 上旬 | 18.6 | 6.0 | 11.8 | 0.1 | 2.4 | 57.4 | 0 | 0 |
| 中旬 | 18.3 | 7.9 | 14.1 | 1.6 | 2.4 | 59.1 | 0 | 0 | |
| 下旬 | 18.4 | 10.3 | 16.9 | 3.6 | 2.4 | 65.3 | 0 | 0 | |
| 5月 | 上旬 | 22.3 | 12.4 | 18.8 | 5.8 | 2.3 | 63.1 | 0 | 0 |
| 中旬 | 24.0 | 13.7 | 19.8 | 7.7 | 2.0 | 61.6 | 0 | 0 | |
| 下旬 | 27.8 | 15.5 | 22.0 | 9.4 | 1.8 | 74.1 | 0 | 0 | |
| 6月 | 上旬 | 20.0 | 16.6 | 22.9 | 10.9 | 1.6 | 66.7 | 0 | 0 |
| 中旬 | 30.7 | 17.7 | 23.5 | 12.8 | 1.5 | 53.9 | 0 | 0 | |
| 下旬 | 36.3 | 18.9 | 24.5 | 14.1 | 1.5 | 52.5 | 0 | 0 | |
| 7月 | 上旬 | 51.3 | 20.3 | 25.6 | 16.2 | 1.4 | 46.0 | 0 | 0 |
| 中旬 | 59.8 | 20.9 | 25.9 | 17.0 | 1.3 | 39.4 | 0 | 0 | |
| 下旬 | 48.6 | 23.0 | 28.2 | 18.8 | 1.4 | 58.1 | 0 | 0 | |
| 8月 | 上旬 | 36.3 | 23.3 | 28.7 | 19.1 | 1.4 | 57.4 | 0 | 0 |
| 中旬 | 52.1 | 22.6 | 27.8 | 18.5 | 1.3 | 50.3 | 0 | 0 | |
| 下旬 | 65.7 | 21.6 | 26.9 | 17.4 | 1.2 | 52.9 | 0 | 0 | |
| 9月 | 上旬 | 41.4 | 20.7 | 26.0 | 16.4 | 1.2 | 50.6 | 0 | 0 |
| 中旬 | 66.7 | 18.5 | 23.9 | 14.1 | 1.2 | 45.9 | 0 | 0 | |
| 下旬 | 37.6 | 15.8 | 21.7 | 10.8 | 1.2 | 49.7 | 0 | 0 | |
| 10月 | 上旬 | 44.3 | 14.0 | 19.7 | 9.1 | 1.3 | 45.3 | 0 | 0 |
| 中旬 | 28.4 | 11.7 | 18.2 | 6.0 | 1.4 | 55.0 | 0 | 0 | |
| 下旬 | 32.8 | 9.7 | 15.8 | 4.2 | 1.5 | 49.4 | 0 | 0 | |
| 11月 | 上旬 | 21.2 | 7.9 | 13.8 | 2.4 | 1.8 | 46.6 | 0 | 0 |
| 中旬 | 22.1 | 5.4 | 10.7 | 0.4 | 1.8 | 35.5 | 1 | 1 | |
| 下旬 | 21.0 | 3.6 | 8.6 | -0.9 | 1.9 | 35.5 | 1 | 1 | |
| 12月 | 上旬 | 19.7 | 1.6 | 6.0 | -2.5 | 1.8 | 31.3 | 8 | 3 |
| 中旬 | 17.0 | -0.1 | 3.8 | -4.2 | 1.9 | 30.4 | 17 | 7 | |
| 下旬 | 23.1 | -0.8 | 3.1 | -4.8 | 2.0 | 34.8 | 25 | 14 | |