| Years | Rainfall Anomaly Index (RAI) | Classification |
| 2018, 2020 | >4 | Extremely humid |
| 2017, 2011, 2019, 2012 | 2 to 3.99 | Very humid |
| 2001, 2022, 1998, 1994, 2003, 1997, 2013, 2015, 2010 | 0 to 1.99 | Humid |
| 2005, 2002, 2006, 2016, 2007, 2021 | −1.99 to 0 | Dry |
| 1993, 1999, 2009, 2014, 1992, 2004, 1995, 1996, 1990, 2008, 1991 | −3.99 to −2 | Very dry |
| 2000 | <−4 | Extremely dry |