Transition

Northeast

Northwest

Year to date IPS

Characteristics of the years

1999, 2003

1988

>2

Extreme humidity

1988; 1995; 2004; 2007; 2008

1989; 1991; 1995; 2008; 2014

1991; 1998; 2003; 2009; 2012

[1; 2]

Very rainy

1984; 1985; 1987; 1989; 2006; 2010; 2014

1984; 1994; 1996; 1998; 2004; 2009; 2010; 2012

1986; 1994; 1995; 1996; 2004; 2007; 2008; 2010; 2011

[0.25; 1]

Moderately rainy

1994, 1996; 1997; 2002

1985; 1993; 1999; 2000; 2003; 2007;

1981; 1982; 1999; 2005

[−0.25; 0.25]

Normal

1981; 1986; 1990; 1991; 1992; 1993; 2000; 2001; 2009; 2011; 2012; 2013

1981; 1982; 1986 1990; 1992; 1997; 2002; 2006; 2011; 2016

1984; 1987; 1988; 1989; 1990; 1992; 1993; 1997; 2001; 2002; 2006; 2015; 2016

[−1; −0.25]

Moderately dry

1982; 1998; 2005; 2015; 2016

1987; 2001; 2005; 2013; 2015

1985; 2000; 2013; 2014

IPS [−2; −1]

Very dry

1983

1983

1983

IPS < −2

Extreme drought