平年値（旬ごとの値）
 |
 |  |
 |  |  |  |
古河（茨城県) 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 | /// | /// | |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 30 | 0 | 0 | |
| 1月 | 上旬 | 6.8 | 3.8 | 9.7 | -1.3 | 1.7 | 69.4 | /// | /// |
| 中旬 | 12.2 | 3.4 | 9.0 | -1.5 | 1.7 | 66.5 | /// | /// | |
| 下旬 | 16.1 | 3.6 | 9.1 | -1.3 | 1.9 | 74.2 | /// | /// | |
| 2月 | 上旬 | 7.9 | 3.8 | 9.5 | -1.3 | 1.9 | 71.0 | /// | /// |
| 中旬 | 16.2 | 4.5 | 10.2 | -0.6 | 1.9 | 67.6 | /// | /// | |
| 下旬 | 11.0 | 5.7 | 11.4 | 0.5 | 2.0 | 56.5 | /// | /// | |
| 3月 | 上旬 | 26.7 | 6.7 | 12.3 | 1.6 | 1.9 | 60.6 | /// | /// |
| 中旬 | 16.5 | 8.3 | 14.3 | 2.7 | 2.0 | 68.1 | /// | /// | |
| 下旬 | 32.8 | 9.4 | 15.3 | 4.1 | 2.0 | 68.5 | /// | /// | |
| 4月 | 上旬 | 35.8 | 11.6 | 17.7 | 6.1 | 1.9 | 66.8 | /// | /// |
| 中旬 | 28.8 | 13.5 | 19.7 | 8.1 | 1.9 | 60.0 | /// | /// | |
| 下旬 | 26.6 | 15.3 | 21.4 | 10.0 | 1.8 | 63.8 | /// | /// | |
| 5月 | 上旬 | 28.4 | 17.2 | 23.1 | 12.1 | 1.7 | 60.0 | /// | /// |
| 中旬 | 40.9 | 18.1 | 23.6 | 13.3 | 1.6 | 57.7 | /// | /// | |
| 下旬 | 50.3 | 19.8 | 25.5 | 15.2 | 1.7 | 66.9 | /// | /// | |
| 6月 | 上旬 | 36.6 | 20.7 | 26.0 | 16.4 | 1.6 | 54.6 | /// | /// |
| 中旬 | 50.0 | 21.8 | 26.6 | 18.1 | 1.6 | 41.7 | /// | /// | |
| 下旬 | 45.4 | 22.9 | 27.3 | 19.4 | 1.5 | 32.3 | /// | /// | |
| 7月 | 上旬 | 62.5 | 24.4 | 29.2 | 20.9 | 1.5 | 40.6 | /// | /// |
| 中旬 | 47.2 | 25.6 | 30.6 | 21.8 | 1.5 | 46.6 | /// | /// | |
| 下旬 | 37.7 | 26.6 | 31.7 | 22.9 | 1.5 | 57.5 | /// | /// | |
| 8月 | 上旬 | 30.9 | 27.4 | 33.0 | 23.4 | 1.6 | 61.2 | /// | /// |
| 中旬 | 43.7 | 26.9 | 32.1 | 23.2 | 1.5 | 52.7 | /// | /// | |
| 下旬 | 61.1 | 26.0 | 31.1 | 22.4 | 1.5 | 54.2 | /// | /// | |
| 9月 | 上旬 | 61.5 | 25.0 | 30.0 | 21.4 | 1.5 | 46.6 | /// | /// |
| 中旬 | 65.5 | 23.3 | 28.1 | 19.6 | 1.4 | 45.0 | /// | /// | |
| 下旬 | 54.4 | 20.6 | 25.2 | 16.9 | 1.4 | 41.6 | /// | /// | |
| 10月 | 上旬 | 68.9 | 19.3 | 23.8 | 15.6 | 1.4 | 40.9 | /// | /// |
| 中旬 | 48.0 | 17.3 | 22.1 | 13.3 | 1.3 | 46.7 | /// | /// | |
| 下旬 | 49.2 | 15.1 | 20.1 | 10.8 | 1.3 | 57.5 | /// | /// | |
| 11月 | 上旬 | 17.2 | 13.1 | 18.4 | 8.4 | 1.1 | 55.5 | /// | /// |
| 中旬 | 23.0 | 10.9 | 16.2 | 6.2 | 1.2 | 54.0 | /// | /// | |
| 下旬 | 21.4 | 9.2 | 14.6 | 4.4 | 1.3 | 55.5 | /// | /// | |
| 12月 | 上旬 | 13.6 | 7.3 | 12.6 | 2.5 | 1.4 | 54.5 | /// | /// |
| 中旬 | 9.9 | 5.7 | 11.3 | 0.7 | 1.5 | 62.4 | /// | /// | |
| 下旬 | 14.3 | 4.5 | 10.3 | -0.4 | 1.6 | 71.6 | /// | /// | |