Average number of heat waves per year
6
6 heat waves
5
4
3
2
1
0
1960s
1970s
1980s
1990s
2000s
2010s
Average duration of heat wave season
68.6
70 days
60
50
40
30
20
10
0
1960s
1970s
1980s
1990s
2000s
2010s
Average number of heat waves per year
6
6 heat waves
5
4
3
2
1
0
1960s
1970s
1980s
1990s
2000s
2010s
Average duration of heat wave season
68.6
70 days
60
50
40
30
20
10
0
1960s
1970s
1980s
1990s
2000s
2010s
Average number of heat waves per year
6
6 heat waves
5
4
3
2
1
0
1960s
1970s
1980s
1990s
2000s
2010s
Average duration of heat wave season
68.6
70 days
60
50
40
30
20
10
0
1960s
1970s
1980s
1990s
2000s
2010s
Average number of heat waves per year
Average duration of heat wave season
6
6 heat waves
70 days
68.6
60
5
50
4
40
3
30
2
20
1
10
0
0
1960s
1970s
1980s
1990s
2000s
2010s
1960s
1970s
1980s
1990s
2000s
2010s
Average number of heat waves per year
Average duration of heat wave season
6
6 heat waves
70 days
68.6
60
5
50
4
40
3
30
2
20
1
10
0
0
1960s
1970s
1980s
1990s
2000s
2010s
1960s
1970s
1980s
1990s
2000s
2010s