SPI classes

Degree of drought

Concerned year

SPI > 2

Extreme humidity

2012, 2016

1 < SPI < 2

Hight humidity

2017, 2009, 2015, 1991

0 < SPI < 1

Moderate humidity

2003, 2014, 2005, 2010, 1999, 1989, 2013, 1987, 2004, 2008, 1978, 1993

0 < SPI < −1

Moderate drought

1988, 1979, 1994, 1981, 2007, 1995, 1992, 2011, 1996, 1990, 1983, 1984, 1986, 1998, 2002, 1977, 1982

−1 < SPI < −2

Severe drought

2001, 2006, 2000, 1980, 1997, 1985

SPI < −2

Extreme drought

-