平年値（年・月ごとの値）
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室戸岬（高知県) 平年値（年・月ごとの値） 主な要素
| 要素 | 気圧 | 降水量 | 気温 | 蒸気圧 | 相対湿度 | 風向・風速 | 日照時間 | 全天日射量 | 雪 | 雲量 | 大気現象 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 現地平均 (hPa) | 海面平均 (hPa) | 合計 (mm) | 平均 (℃) | 日最高 (℃) | 日最低 (℃) | 平均 (hPa) | 平均 (％) | 平均 (m/s) | 最多風向 | 合計 (時) | 平均 (MJ/㎡) | 降雪の深さ | 最深積雪 (cm) | 平均 | 雪日数 | 霧日数 | 雷日数 | ||
| 合計 (cm) | 日合計の最大 (cm) | ||||||||||||||||||
| 統計期間 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | 1991～ 2020 | /// | 1991～ 2008 | 1991～ 2008 | 1991～ 2008 | 1991～ 2008 | 2008～ 2020 | 2008～ 2020 | 1991～ 2008 |
| 資料年数 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 0 | 18 | 18 | 18 | 18 | 13 | 13 | 18 |
| 1月 | 996.1 | 1018.8 | 89.5 | 7.7 | 10.6 | 5.1 | 6.6 | 61 | 7.1 | 西北西 | 179.0 | /// | 0 @ | 0 @ | --- @ | 5.1 @ | 1.8 | 0.8 | 0.7 @ |
| 2月 | 995.7 | 1018.4 | 113.8 | 8.2 | 11.4 | 5.4 | 7.2 | 63 | 7.2 | 西北西 | 172.1 | /// | 0 @ | 0 @ | --- @ | 5.0 @ | 1.7 | 2.8 | 1.1 @ |
| 3月 | 994.1 | 1016.5 | 177.4 | 11.0 | 14.3 | 8.1 | 9.1 | 67 | 7.4 | 北東 | 194.7 | /// | 0 @ | 0 @ | --- @ | 5.9 @ | 0.3 | 3.3 | 1.2 @ |
| 4月 | 992.3 | 1014.3 | 203.2 | 15.2 | 18.2 | 12.5 | 12.6 | 71 | 7.0 | 東北東 | 199.7 | /// | --- @ | --- @ | --- @ | 6.1 @ | 0.0 | 5.7 | 1.6 @ |
| 5月 | 990.0 | 1011.7 | 240.6 | 18.8 | 21.7 | 16.5 | 17.1 | 78 | 6.5 | 東北東 | 196.1 | /// | --- @ | --- @ | --- @ | 7.1 @ | 0.0 | 7.8 | 1.7 @ |
| 6月 | 987.1 | 1008.6 | 330.8 | 21.5 | 23.9 | 19.6 | 22.4 | 87 | 6.6 | 東北東 | 132.3 | /// | --- @ | --- @ | --- @ | 8.2 @ | 0.0 | 12.5 | 1.9 @ |
| 7月 | 987.6 | 1008.7 | 267.9 | 25.0 | 27.6 | 23.2 | 28.4 | 89 | 6.5 | 西北西 | 177.8 | /// | --- @ | --- @ | --- @ | 7.3 @ | 0.0 | 16.5 | 3.7 @ |
| 8月 | 988.3 | 1009.3 | 210.2 | 26.3 | 29.0 | 24.4 | 29.5 | 86 | 6.1 | 東北東 | 227.9 | /// | --- @ | --- @ | --- @ | 6.3 @ | 0.0 | 4.2 | 4.4 @ |
| 9月 | 990.3 | 1011.6 | 322.3 | 24.0 | 26.5 | 22.0 | 24.2 | 80 | 6.2 | 東北東 | 171.2 | /// | --- @ | --- @ | --- @ | 6.7 @ | 0.0 | 3.8 | 4.9 @ |
| 10月 | 994.0 | 1015.7 | 251.8 | 19.8 | 22.2 | 17.6 | 16.9 | 72 | 6.7 | 北東 | 178.5 | /// | --- @ | --- @ | --- @ | 5.7 @ | 0.0 | 1.6 | 2.7 @ |
| 11月 | 996.8 | 1019.0 | 164.3 | 15.1 | 17.7 | 12.7 | 12.2 | 68 | 6.7 | 北東 | 169.3 | /// | 0 @ | 0 @ | --- @ | 5.1 @ | 0.0 | 0.8 | 2.1 @ |
| 12月 | 997.1 | 1019.7 | 93.3 | 10.2 | 13.0 | 7.7 | 8.3 | 63 | 7.1 | 西北西 | 180.4 | /// | 0 @ | 0 @ | --- @ | 4.5 @ | 0.2 | 0.5 | 0.9 @ |
| 年 | 992.5 | 1014.4 | 2465.0 | 16.9 | 19.7 | 14.6 | 16.1 | 74 | 6.8 | 東北東 | 2178.9 | /// | 0 @ | 0 @ | --- @ | 6.1 @ | /// | 61.0 | 26.7 @ |
- 「@」の付いた値は、参考値です。平年差や平年比に利用できません。