①空气中含有足够的水汽 ②气温下降到水汽能够凝结起来的程度 ③湿热空气沿小坡爬升 ④冷空气与暖空气相遇
干球温度
干湿差(两支温度计示数差)
1.0 ℃
2.0 ℃
3.0 ℃
4.0 ℃
5.0 ℃
-50 ℃
77%
54%
32%
11%
0.0 ℃
82%
65%
47%
31/%
15%
86%
71%
58/%
45%
10.0 ℃
88%
76%
44%
15.0 ℃
90%
80%
70%
61%
52%
20.0 ℃
91%
74%
66%
58%
25.0 ℃
92%
83%
68%
30.0 ℃
93%
79%
73%
67%
35.0 ℃
87%
81%
75%
69%