平年値（旬ごとの値）
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八重見ヶ原（東京都) 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 | 2003～ 2020 | 2003～ 2020 | 2003～ 2020 | 2003～ 2020 | 2003～ 2020 | /// | /// | /// | |
| 資料年数 | 18 | 18 | 18 | 18 | 18 | 0 | 0 | 0 | |
| 1月 | 上旬 | 46.1 | 10.9 | 13.6 | 8.3 | 6.2 | /// | /// | /// |
| 中旬 | 49.9 | 10.5 | 13.2 | 7.6 | 6.0 | /// | /// | /// | |
| 下旬 | 64.0 | 10.5 | 13.3 | 7.5 | 6.2 | /// | /// | /// | |
| 2月 | 上旬 | 56.4 | 10.6 | 13.4 | 7.5 | 6.0 | /// | /// | /// |
| 中旬 | 70.4 | 11.2 | 14.1 | 8.2 | 6.4 | /// | /// | /// | |
| 下旬 | 62.7 | 12.2 | 15.1 | 9.2 | 6.3 | /// | /// | /// | |
| 3月 | 上旬 | 110.2 | 12.6 | 15.6 | 9.7 | 6.5 | /// | /// | /// |
| 中旬 | 76.4 | 13.1 | 16.2 | 9.7 | 6.1 | /// | /// | /// | |
| 下旬 | 64.8 | 13.6 | 16.8 | 10.2 | 5.8 | /// | /// | /// | |
| 4月 | 上旬 | 62.8 | 15.2 | 18.4 | 11.9 | 5.9 | /// | /// | /// |
| 中旬 | 69.6 | 16.7 | 19.7 | 13.7 | 5.6 | /// | /// | /// | |
| 下旬 | 44.8 | 17.5 | 20.5 | 14.3 | 5.0 | /// | /// | /// | |
| 5月 | 上旬 | 90.9 | 19.1 | 22.1 | 16.1 | 4.9 | /// | /// | /// |
| 中旬 | 82.5 | 19.5 | 22.4 | 16.6 | 5.4 | /// | /// | /// | |
| 下旬 | 90.3 | 20.4 | 23.5 | 17.4 | 4.7 | /// | /// | /// | |
| 6月 | 上旬 | 87.6 | 21.0 | 23.9 | 18.4 | 4.8 | /// | /// | /// |
| 中旬 | 149.1 | 22.2 | 24.7 | 20.1 | 5.0 | /// | /// | /// | |
| 下旬 | 114.4 | 23.6 | 26.0 | 21.8 | 5.0 | /// | /// | /// | |
| 7月 | 上旬 | 114.2 | 24.9 | 27.3 | 23.0 | 5.2 | /// | /// | /// |
| 中旬 | 75.8 | 26.2 | 29.1 | 24.2 | 4.7 | /// | /// | /// | |
| 下旬 | 68.8 | 26.7 | 29.7 | 24.3 | 4.5 | /// | /// | /// | |
| 8月 | 上旬 | 60.9 | 27.3 | 30.5 | 24.8 | 3.8 | /// | /// | /// |
| 中旬 | 36.9 | 27.6 | 30.7 | 25.4 | 4.5 | /// | /// | /// | |
| 下旬 | 76.4 | 27.1 | 30.3 | 24.6 | 4.3 | /// | /// | /// | |
| 9月 | 上旬 | 74.0 | 26.6 | 29.7 | 24.1 | 4.5 | /// | /// | /// |
| 中旬 | 86.8 | 25.5 | 28.6 | 22.9 | 4.8 | /// | /// | /// | |
| 下旬 | 133.7 | 24.2 | 27.0 | 21.7 | 6.1 | /// | /// | /// | |
| 10月 | 上旬 | 165.6 | 23.3 | 26.1 | 20.8 | 5.7 | /// | /// | /// |
| 中旬 | 170.1 | 21.8 | 24.5 | 19.4 | 6.6 | /// | /// | /// | |
| 下旬 | 113.0 | 20.7 | 23.5 | 17.9 | 5.8 | /// | /// | /// | |
| 11月 | 上旬 | 65.4 | 19.4 | 22.4 | 16.1 | 4.8 | /// | /// | /// |
| 中旬 | 119.6 | 17.7 | 20.6 | 14.6 | 5.5 | /// | /// | /// | |
| 下旬 | 77.2 | 16.6 | 19.4 | 13.6 | 5.4 | /// | /// | /// | |
| 12月 | 上旬 | 68.0 | 14.7 | 17.5 | 11.6 | 5.7 | /// | /// | /// |
| 中旬 | 60.7 | 13.1 | 15.7 | 10.1 | 5.8 | /// | /// | /// | |
| 下旬 | 52.7 | 12.1 | 15.0 | 9.1 | 6.1 | /// | /// | /// | |