Multiyear Annual Average of the Rainfall PH Value
Year\
Station
Alishan Anbu Chenggong Chiayi Hengchun Hsinchu Hualien Kaohsiung Keelung Kinmen Matsu Penghu Sun Moon Lake Taichung Taipei Tainan Taitung Yilan
1972 * * * * * * * * * * * * 6.2 * 5.5 * * *
1973 * * * * 6.8 * 6.7 7.5 5.4 * * * 5.7 * 5.4 * 6.5 *
1974 * * * * * * * * * * * * 6.2 * 6.1 * * *
1975 * * * * * * * * * * * * 5.9 * 5.7 * * *
1976 * * * * * * * * * * * * 6.1 * 5.8 * * *
1977 * * * * 6.9 * 6.8 7.0 5.3 * * * 5.5 * 5.5 * 7.1 *
1978 * * * * 6.8 * 7.0 6.8 5.2 * * * 5.8 * 5.7 * 7.4 *
1979 * * * * 6.8 * 7.3 6.7 6.5 * * * 6.2 * 6.0 * 7.4 *
1980 * * * * 6.8 * 6.7 6.5 6.3 * * * 6.4 * 6.6 * 6.8 *
1981 * * * * 7.1 * 6.8 6.8 6.6 * * * 6.7 * 6.7 * 6.6 *
1982 * * * * 6.8 * 6.9 6.8 6.8 * * * 6.7 * 6.8 * 6.8 *
1983 * * * * 6.9 * 6.8 6.8 6.5 * * * 6.8 * 6.5 * 6.9 *
1984 * * * * 6.8 * 6.6 6.6 6.7 * * * 6.7 * 6.4 * 6.8 *
1985 * * * * 6.5 * 6.1 6.5 6.5 * * * 6.6 * 6.3 * 6.5 *
1986 * * * * 6.5 * 6.7 6.5 5.4 * * * 5.4 * 4.7 * 6.8 *
1987 * * * * 6.2 * 6.0 6.5 4.3 * * * 4.4 * 4.3 * 5.7 *
1988 * * * * 6.3 * 6.3 6.6 4.6 * * * 4.5 * 4.6 * 6.6 *
1989 6.2 5.5 5.9 6.6 6.6 6.4 6.8 6.5 4.5 * * * 4.6 6.0 4.4 5.5 6.6 6.3
1990 6.2 5.6 5.4 6.5 6.4 5.5 6.9 6.1 4.4 * * * 4.4 5.9 4.9 5.1 6.6 6.5
1991 5.9 6.1 6.4 6.6 7.2 5.3 6.6 6.4 4.7 * * * 5.2 6.3 5.1 5.9 6.9 6.4
1992 6.2 5.9 6.1 6.5 6.8 6.1 6.4 6.3 5.3 * * * 5.5 6.3 5.7 6.0 7.0 6.3
1993 6.3 6.0 6.1 6.4 6.7 6.5 6.6 6.4 5.9 * * * 5.9 6.5 5.2 6.5 6.5 6.3
1994 5.8 5.6 6.4 6.2 6.8 6.2 6.2 6.4 5.8 * * * 4.9 5.6 5.4 6.4 6.5 6.0
1995 5.6 5.3 6.0 5.7 6.1 5.6 5.9 5.5 5.2 * * * 5.3 5.6 5.5 6.1 6.4 5.8
1996 6.0 5.3 5.7 5.9 6.6 5.5 5.6 5.4 5.3 * * * 5.3 5.6 5.6 5.9 6.5 5.8
1997 5.8 5.1 5.6 5.6 6.3 5.7 5.5 5.4 4.8 * * * 5.2 6.0 5.2 5.7 6.5 5.6
1998 5.7 5.0 5.7 5.5 6.2 5.9 5.5 5.8 5.0 * * * 5.0 5.9 5.5 6.2 6.6 5.7
1999 5.6 5.5 5.6 5.7 6.2 5.8 5.5 5.7 4.6 * * * 5.5 5.6 5.3 5.8 6.5 6.0
2000 5.7 5.6 5.8 5.7 5.9 5.7 5.8 5.8 4.6 * * * 5.4 5.7 5.1 5.8 6.4 5.9
2001 5.7 5.5 5.6 5.6 5.9 5.6 5.9 5.7 4.6 * * * 5.5 5.4 4.9 5.6 5.9 5.8
2002 5.8 5.7 5.7 5.7 5.9 5.5 6.0 5.8 4.9 * * * 5.3 5.6 5.1 5.5 5.7 5.8
2003 6.0 5.4 5.8 5.9 5.9 5.6 6.0 5.9 4.5 * * * 5.3 5.7 5.3 5.5 5.8 5.8
2004 5.9 5.5 5.4 5.8 5.9 5.5 6.1 5.8 4.7 5.5 5.2 * 5.6 5.8 5.2 5.4 6.0 5.9
2005 5.8 4.7 5.5 5.7 5.8 5.4 6.1 5.7 4.5 5.5 4.7 * 5.8 5.9 5.2 5.9 6.0 5.5
2006 5.9 4.5 5.2 5.7 6.0 5.4 5.8 5.7 4.4 4.8 4.8 * 5.3 5.8 5.1 5.9 6.0 4.9
2007 5.8 4.4 5.2 5.8 6.1 5.3 5.7 5.5 4.4 4.9 4.7 * 5.4 5.7 4.9 5.8 5.9 5.1
2008 5.9 4.4 5.3 5.8 5.8 5.1 5.5 5.4 4.2 4.7 4.7 5.4 5.6 5.7 5.0 5.6 5.7 5.1
2009 6.2 4.4 5.3 5.7 5.9 5.1 5.6 5.2 4.5 4.8 4.9 5.6 5.7 5.9 5.3 5.8 5.9 5.4
2010 6.2 4.4 5.2 5.8 6.2 4.9 5.6 5.5 4.5 4.9 4.7 5.6 5.3 5.6 5.2 5.9 5.8 5.5
2011 6.1 4.6 5.3 5.7 6.4 5.0 5.9 5.5 4.3 4.4 4.6 5.5 5.4 6.0 4.9 6.0 5.8 5.1
2012 6.3 4.7 5.2 6.0 5.6 4.8 5.4 5.7 4.6 4.5 5.0 5.5 5.4 5.9 5.0 6.2 6.0 5.0
2013 6.0 5.1 5.2 6.1 5.7 5.0 5.6 5.4 4.6 4.8 5.1 5.4 5.3 5.9 5.1 6.1 6.1 5.0
2014 5.8 4.6 5.3 5.9 5.6 5.3 5.7 5.4 4.5 4.8 5.3 5.1 5.2 5.7 4.9 6.0 5.9 4.8
2015 6.0 4.8 5.3 6.1 5.5 5.2 5.8 5.7 4.6 4.9 4.9 5.4 5.4 5.9 5.1 6.0 6.0 5.2
2016 5.9 4.8 5.1 6.2 5.7 5.4 5.5 5.6 4.6 5.2 5.4 5.8 5.5 6.1 5.1 6.2 6.3 5.4
Mean 5.9 5.1 5.6 5.9 6.3 5.5 6.2 6.1 5.1 4.9 4.9 5.5 5.6 5.8 5.4 5.9 6.4 5.6
Max 6.3 6.1 6.4 6.6 7.2 6.5 7.3 7.5 6.8 5.5 5.4 5.8 6.8 6.5 6.8 6.5 7.4 6.5
Min 5.6 4.4 5.1 5.5 5.5 4.8 5.4 5.2 4.2 4.4 4.6 5.1 4.4 5.4 4.3 5.1 5.7 4.8
 

Notes:

  1. "-" indicates no rain or inadequate rainfall.
  2. According to the EPA's regulation, rainfall with pH value below 5.0 is classified as acid rain, indicated by red italics here.
  3. The Central Weather Bureau applies wet deposition method in collecting samples of rainwater from 2005. Prior to 2005, bulk deposition method was used.