平年値（旬ごとの値）
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大井沢（山形県) 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 | 123.7 | -1.7 | 1.5 | -4.9 | 1.0 | 6.9 | 124 | 143 |
| 中旬 | 101.0 | -2.5 | 0.8 | -6.1 | /// | 9.4 | 113 | 176 | |
| 下旬 | 120.7 | -2.7 | 0.6 | -6.2 | /// | 10.2 | 140 | 205 | |
| 2月 | 上旬 | 91.1 | -2.6 | 1.1 | -6.5 | 1.1 | 12.5 | 115 | 228 |
| 中旬 | 85.8 | -2.2 | 1.5 | -6.2 | 1.1 | 14.0 | 108 | 239 | |
| 下旬 | 53.4 | -1.4 | 3.1 | -6.1 | 1.1 | 19.6 | 69 | 231 | |
| 3月 | 上旬 | 68.6 | -0.4 | 3.8 | -4.5 | 1.2 | 22.8 | 76 | 227 |
| 中旬 | 61.5 | 0.6 | 5.4 | -4.0 | 1.2 | 30.6 | 67 | 220 | |
| 下旬 | 55.0 | 1.6 | 6.7 | -3.1 | 1.1 | 41.1 | 54 | 194 | |
| 4月 | 上旬 | 49.1 | 3.4 | 9.2 | -1.5 | 1.1 | 46.9 | 35 | 159 |
| 中旬 | 46.4 | 5.0 | 11.6 | -0.4 | 1.1 | 49.9 | 23 | 111 | |
| 下旬 | 46.9 | 7.1 | 14.5 | 0.9 | 1.0 | 59.0 | 11 | 56 | |
| 5月 | 上旬 | 45.4 | 10.1 | 17.8 | 3.2 | 1.1 | 62.4 | 3 | 15 |
| 中旬 | 48.3 | 11.9 | 19.0 | 5.1 | 1.0 | 60.8 | 0 | 1 | |
| 下旬 | 44.8 | 14.1 | 21.4 | 7.0 | 0.8 | 72.6 | 0 | 0 | |
| 6月 | 上旬 | 30.2 | 15.6 | 22.6 | 8.7 | 0.8 | 64.5 | 0 | 0 |
| 中旬 | 47.6 | 16.9 | 23.0 | 11.3 | 0.7 | 46.0 | 0 | 0 | |
| 下旬 | 90.3 | 18.3 | 24.0 | 13.1 | 0.7 | 40.5 | 0 | 0 | |
| 7月 | 上旬 | 109.0 | 19.8 | 25.0 | 15.2 | 0.7 | 37.2 | 0 | 0 |
| 中旬 | 111.6 | 20.7 | 25.9 | 16.3 | 0.6 | 36.3 | 0 | 0 | |
| 下旬 | 71.0 | 22.1 | 27.9 | 17.4 | 0.6 | 49.8 | 0 | 0 | |
| 8月 | 上旬 | 48.6 | 22.7 | 28.9 | 17.8 | 0.6 | 55.0 | 0 | 0 |
| 中旬 | 64.1 | 22.0 | 27.8 | 17.4 | 0.6 | 44.2 | 0 | 0 | |
| 下旬 | 87.1 | 20.9 | 26.6 | 16.3 | 0.6 | 44.2 | 0 | 0 | |
| 9月 | 上旬 | 52.7 | 19.9 | 25.5 | 15.5 | 0.6 | 38.3 | 0 | 0 |
| 中旬 | 67.9 | 17.7 | 23.3 | 13.3 | 0.6 | 36.1 | 0 | 0 | |
| 下旬 | 58.8 | 14.9 | 20.5 | 10.1 | 0.6 | 35.3 | 0 | 0 | |
| 10月 | 上旬 | 70.9 | 13.3 | 19.0 | 8.4 | 0.7 | 33.7 | 0 | 0 |
| 中旬 | 52.0 | 11.0 | 17.2 | 5.8 | 0.7 | 37.5 | 0 | 0 | |
| 下旬 | 79.9 | 9.1 | 15.0 | 4.2 | 0.8 | 36.9 | 0 | 0 | |
| 11月 | 上旬 | 73.7 | 7.2 | 13.4 | 1.9 | 1.0 | 32.5 | 3 | 2 |
| 中旬 | 101.2 | 4.9 | 10.0 | 0.6 | 0.9 | 22.2 | 12 | 9 | |
| 下旬 | 96.0 | 3.1 | 8.0 | -0.8 | 0.9 | 21.2 | 25 | 17 | |
| 12月 | 上旬 | 103.4 | 1.4 | 5.4 | -1.9 | 0.9 | 13.9 | 54 | 36 |
| 中旬 | 131.1 | -0.3 | 3.3 | -3.4 | 0.9 | 9.6 | 104 | 81 | |
| 下旬 | 129.9 | -0.8 | 2.6 | -4.0 | 1.1 | 12.3 | 119 | 111 | |