What is the average highest temperature in Harbin over the years?

"Harbin monthly average temperature from 1991 to 2006"

"Harbin monthly average temperature from 1991 to 2006"

"Unit: degrees Celsius"

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"Year","January","February","March","April","May","June","July","August"," 09","October","November","December"

1991,-19,-12.4,-4,7.2,15.8,19.8,21.2,22.8,14.4,6.2, -3.4,-15.4

1992,-15.9,-12.1,-1.7,7.1,14.5,18.2,23.2,20.6,13.3,6.4,-6.7,-15.6

1993 ,-18.6,-10.9,-0.9,6.3,15.4,18.5,22.7,20,14.9,5.8,-5.8,-14.8

1994,-20.5,-13.5,-4.7,8.7,14.3 ,22.3,24.1,22,15.4,6.6,-2.4,-15.9

1995,-15.1,-10.7,-2.5,6.1,12.9,12.9,22.8,21.1,14.9,7.7,-3.3 ,-12.2

1996,-15.3,-10.3,-2.3,7.8,17.2,21.4,23,21,14.1,5,-6.6,-14.6

1997,- 17.6,-10.1,-2.2,8.9,14.7,22.2,25.1,22,14.3,3.9,-2.5,-10.8

1998,-18.8,-7.9,0.2,11.8,17.3,20.9, 23.7,21.3,16.3,8.9,-8.5,-19

1999,-14.5,-10.5,-6.5,7.2,13.7,19.9,25,21,15.1,5.1,-4.1,-13.7

2000,-20,-14.4,-2.3,7,16.2,23.5,24.9,23.1,17,5.9,-7.2,-18.4

2001,-22.8,- 16.5,-4.4,8.6,16.5,22.8,24.5,21.7,15.8,8.2,-2.4,-13.9

2002,-14.3,-7.9,1,8.7,17.3,19.7,23.5,20.1 ,16.5,4.1,-9.1,-15

2003,-15.7,-9.1,0.1,9.9,16.6,21.2,22.1,20.8,15.9,7.3,-5.3,-13.1

2004,-16,-10.7,-2,7.7,15.6,23.4,22.8,21.7,16.6,8.7,-1.7,-16

2005,-16.4,-16.7,-4 ,7.7,14.4,21.7,22.8,22.3,16.3,7.7,-2.3,-16.7

2006,-17.7,-12.6,-2.8,5.9,17.1,19.9,23.4,23.1,16.2, 7.4,-4.5,-12.1,"Yu Qun"

"Data source: National Statistical Database of the People's Republic of China"