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Table 4 Computation of Normalized Rainfall Index (NRI) for the study area (Maiduguri, Nguru and Potiskum Stations)

From: Drought occurrences and its implications on the households in Yobe state, Nigeria

Years NRI for Potiskum Character of rainfall NRI for Nguru Character of rainfall NRI for Maiduguri Character of rainfall
1986 0.91 Moderately wet −0.41 Near normal −0.49 Near normal
1987 −1.36 Severe drought −2.11 Severe drought −1.92 Severe drought
1988 0.38 Near normal 0.14 Near normal 0.45 Near normal
1989 2.05 Very wet −2.27 Severe drought 0.36 Near normal
1990 − 0.37 Near normal 0.15 Near normal −2.81 Severe drought
1991 −1.17 Moderate drought − 1.72 Severe drought − 1.77 Severe drought
1992 − 1.18 Moderate drought 0.54 Mildly wet −0.2 Near normal
1993 −1.45 Severe drought −2.21 Severe drought −1.63 Severe drought
1994 0.68 Mildly wet 2.78 Very wet −2.26 Severe drought
1995 −1.15 Moderate drought −0.77 Mild drought 0.90 Moderately wet
1996 0.26 Near normal 0.99 Moderately wet 0.39 Near normal
1997 0.29 Near normal 1.58 Very wet −0.90 Moderate drought
1998 1.02 Moderately wet 0.72 Mildly wet 0.98 Moderately wet
1999 0.24 Near normal 0.39 Near normal 2.08 Very wet
2000 −1.65 Severe drought −1.6 Severe drought 0.86 Moderately wet
2001 0.55 Mildly wet −0.45 Near normal 1.39 Very wet
2002 −0.29 Near normal 0.58 Mildly wet −2.64 Severe drought
2003 0.22 Near normal 1.01 Moderately wet 0.59 Mildly wet
2004 −2.16 Severe drought −2.84 Severe drought 0.42 Near normal
2005 0.47 Near normal 0.56 Mildly wet 3.18 Very wet
2006 −0.91 Moderate drought −0.14 Near normal −0.75 Mild drought
2007 −0.48 Near normal 0.83 Mildly wet 1.42 Very wet
2008 1.02 Moderately wet −1.94 Severe drought −0.44 Near normal
2009 −0.54 Mild drought −1.02 Moderate drought −0.25 Near normal
2010 −1.53 Severe drought 0.88 Moderately wet −3.38 Severe drought
2011 −0.53 Mild drought −0.98 Moderate drought 0.35 Near normal
2012 1.02 Moderately wet 0.87 Moderately wet 1.10 Moderately wet
2013 −0.13 Near normal −0.63 Mild drought −1.47 Severe drought
2014 0.90 Moderately wet 0.61 Mildly wet −0.19 Near normal
2015 −0.33 Near normal −1.21 Moderate drought −0.57 Mild drought
2016 0.57 Mildly wet 0.69 Mildly wet 0.53 Mildly wet
2017 −1.27 Moderate drought −0.97 Moderate drought −1.19 Moderate drought
  1. Source: Computed by the Author using Microsoft Excel