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不快指数
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不快指数 |  |
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不快指数は、気温が高いときに人が感じる不快感「蒸し暑さ」を表す指数です。 DI（不快指数） ＝ 0.72 ( Td + Tw ) + 40.6 で計算される指数で、気温と相対湿度を軸にとると以下の表のような数値になります。 ただし、人が感じる快・不快の感覚は日射や気流（風）も影響するため、すべての場合において有効な数値であるとはいえません。室内などの風屋日射の影響がない場合には便利な指標だといえます。 |
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相対湿度（％）
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|
0
|
5
|
10
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
55
|
60
|
65
|
70
|
75
|
80
|
85
|
90
|
95
|
100
|
||
|
気 温 ℃ |
50
|
86.8
|
88.6
|
90.3
|
92.1
|
93.8
|
95.6
|
97.4
|
99.1
|
|||||||||||||
|
48
|
85.2
|
86.9
|
88.5
|
90.2
|
91.8
|
93.5
|
95.2
|
96.8
|
98.5
|
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|
46
|
83.6
|
85.2
|
86.7
|
88.3
|
89.8
|
91.4
|
93.0
|
94.5
|
96.1
|
97.6
|
99.2
|
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|
44
|
81.9
|
83.4
|
84.8
|
86.3
|
87.8
|
89.2
|
90.7
|
92.2
|
93.6
|
95.1
|
96.6
|
98.0
|
99.5
|
|||||||||
|
42
|
80.3
|
81.7
|
83.0
|
84.4
|
85.8
|
87.1
|
88.5
|
89.9
|
91.2
|
92.6
|
94.0
|
95.3
|
96.7
|
98.0
|
99.4
|
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|
40
|
78.7
|
80.0
|
81.2
|
82.5
|
83.8
|
85.0
|
86.3
|
87.6
|
88.8
|
90.1
|
91.4
|
92.6
|
93.9
|
95.1
|
96.4
|
97.7
|
98.9
|
|||||
|
38
|
77.1
|
78.3
|
79.4
|
80.5
|
81.8
|
82.9
|
84.1
|
85.3
|
86.4
|
87.6
|
88.8
|
89.9
|
91.1
|
92.2
|
93.4
|
94.6
|
95.7
|
96.9
|
98.1
|
99.2
|
||
|
36
|
75.5
|
76.6
|
77.6
|
78.7
|
79.8
|
80.8
|
81.9
|
83.0
|
84.0
|
85.1
|
86.2
|
87.2
|
88.3
|
89.3
|
90.4
|
91.5
|
92.5
|
93.6
|
94.7
|
95.7
|
96.8
|
|
|
34
|
73.8
|
74.8
|
75.7
|
76.7
|
77.7
|
78.7
|
79.6
|
80.6
|
81.6
|
82.5
|
83.5
|
84.5
|
85.5
|
86.4
|
87.4
|
88.4
|
89.3
|
90.3
|
91.3
|
92.2
|
93.2
|
|
|
32
|
72.2
|
73.1
|
73.9
|
74.8
|
75.7
|
76.6
|
77.4
|
78.3
|
79.2
|
80.0
|
80.9
|
81.8
|
82.6
|
83.5
|
84.4
|
85.3
|
86.1
|
87.0
|
87.9
|
88.7
|
89.6
|
|
|
30
|
70.6
|
71.4
|
72.1
|
72.9
|
73.7
|
74.5
|
75.2
|
76.0
|
76.8
|
77.5
|
78.3
|
79.1
|
79.8
|
80.6
|
81.4
|
82.2
|
82.9
|
83.7
|
84.5
|
85.2
|
86.0
|
|
|
28
|
69.0
|
69.7
|
70.3
|
71.0
|
71.7
|
72.4
|
73.0
|
73.7
|
74.4
|
75.0
|
75.7
|
76.4
|
77.0
|
77.7
|
78.4
|
79.1
|
79.7
|
80.4
|
81.1
|
81.7
|
82.4
|
|
|
26
|
67.4
|
68.0
|
68.5
|
69.1
|
69.7
|
70.3
|
70.8
|
71.4
|
71.9
|
72.5
|
73.1
|
73.7
|
74.2
|
74.8
|
75.4
|
75.9
|
76.5
|
77.1
|
77.7
|
78.2
|
78.8
|
|
|
24
|
65.7
|
66.2
|
66.6
|
67.1
|
67.6
|
68.1
|
68.5
|
69.0
|
69.5
|
69.9
|
70.4
|
70.9
|
71.3
|
71.8
|
72.3
|
72.8
|
73.2
|
73.3
|
74.2
|
74.6
|
75.1
|
|
|
22
|
64.1
|
64.5
|
64.9
|
65.2
|
65.6
|
66.0
|
66.4
|
66.8
|
67.1
|
67.5
|
67.9
|
68.2
|
68.6
|
69.0
|
69.4
|
69.7
|
70.1
|
70.5
|
70.9
|
71.2
|
71.6
|
|
|
20
|
62.5
|
62.8
|
63.1
|
63.3
|
63.6
|
63.9
|
64.2
|
64.4
|
64.7
|
65.0
|
65.3
|
65.5
|
65.8
|
66.1
|
66.4
|
66.6
|
66.9
|
67.2
|
67.5
|
67.7
|
68.0
|
|
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日本人の体感による不快指数
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| ８５．１〜 | 非常に不快（暑くてたまらない） |
| ８０．１〜８５．０ | ほぼ全員が不快に感じる 暑くて汗が出る |
| ７５．１〜８０．０ | 半数以上の人が不快に感じる |
| ７０．１〜７５．０ | やや暑く、１割程度の人が不快に感じる |
| ６５．１〜７０．０ | 涼しい、または快く感じる |
| ６０．１〜６５．０ | 暑くも寒くもない |
| 〜６０．０ | 肌寒く感じる |