再现间隔(年) | 保证率 | 极端最低气温(℃) | 方差 | 标准差 | 有效系数 |
2 | 0.5 | −2.5 | 0.0 | 0.2 | 1.0 |
5 | 0.8 | −4.1 | 0.1 | 0.3 | 0.9 |
10 | 0.9 | −5.2 | 0.2 | 0.4 | 0.9 |
20 | 0.95 | −6.2 | 0.3 | 0.5 | 0.9 |
50 | 0.98 | −7.5 | 0.5 | 0.7 | 0.8 |
100 | 0.99 | −8.5 | 0.6 | 0.8 | 0.8 |
200 | 0.995 | −9.4 | 0.8 | 0.9 | 0.8 |
500 | 0.998 | −10.7 | 1.1 | 1.1 | 0.8 |
1000 | 0.999 | −11.7 | 1.4 | 1.2 | 0.8 |