Research Article
Statistical Analysis of Rainfall Trend for Volta Region in Ghana
Table 5
Descriptive statistics of annual rainfall of northern zone.
| | Year | Parameters | | Annual (mm) | Mean (mm) | Median (mm) | S.D. (mm) | Variance (mm) | Skewness | kurtosis | Min (mm) | Max (mm) | Range (mm) |
| | 1981 | 1241.6 | 103.5 | 83.7 | 96.4 | 9298.6 | 0.2 | −1.8 | 0.0 | 239.4 | 239.4 | | 1982 | 1071.8 | 89.3 | 99.6 | 68.1 | 4642.2 | 0.1 | −1.0 | 0.0 | 204.8 | 204.8 | | 1983 | 1060.7 | 88.4 | 60.9 | 95.2 | 9068.9 | 0.8 | −0.6 | 0.0 | 273.9 | 273.9 | | 1984 | 1735.2 | 144.6 | 77.1 | 150.6 | 22682.2 | 0.6 | −1.3 | 0.0 | 384.1 | 384.1 | | 1985 | 1336.8 | 111.4 | 83.0 | 112.5 | 12659.3 | 0.5 | −1.6 | 0.0 | 284.0 | 284.0 | | 1986 | 1370.1 | 114.2 | 108.6 | 97.8 | 9571.7 | −0.0 | −2.0 | 0.0 | 229.2 | 229.2 | | 1987 | 1351.4 | 112.6 | 84.8 | 126.5 | 16004.2 | 1.1 | 0.8 | 0.0 | 398.1 | 398.1 | | 1988 | 1064.4 | 88.7 | 56.2 | 88.4 | 7825.1 | 0.6 | −1.2 | 0.0 | 246.2 | 246.2 | | 1989 | 1479.5 | 123.3 | 23.4 | 161.7 | 26155.4 | 1.1 | −0.2 | 0.0 | 430.2 | 430.2 | | 1990 | 1336.7 | 111.4 | 114.4 | 97.7 | 9553.3 | 0.4 | −0.8 | 0.0 | 296.5 | 296.5 | | 1991 | 2431.5 | 202.6 | 179.6 | 182.8 | 33425.1 | 0.3 | −1.4 | 0.0 | 498.1 | 498.1 | | 1992 | 970.7 | 88.2 | 58.9 | 88.7 | 7872.5 | 0.7 | −0.4 | 0.0 | 257.4 | 257.4 | | 1993 | 1003.2 | 83.6 | 44.8 | 95.1 | 9052.5 | 1.5 | 2.1 | 0.0 | 316.3 | 316.3 | | 1994 | 1197.9 | 99.8 | 116.8 | 93.7 | 8780.1 | 0.0 | −1.9 | 0.0 | 226.9 | 226.9 | | 1995 | 1680.8 | 140.1 | 145.6 | 125.7 | 15821.9 | 0.2 | −1.4 | 0.0 | 350.4 | 350.4 | | 1996 | 1539.8 | 128.3 | 149.1 | 119.2 | 14226.2 | −0.1 | −2.1 | 0.0 | 274.6 | 274.6 | | 1997 | 1387.9 | 115.7 | 84.8 | 107.8 | 11635.4 | 0.4 | −1.5 | 0.0 | 277.2 | 277.2 | | 1998 | 982.5 | 89.3 | 60.3 | 81.1 | 6583.3 | 0.2 | −1.7 | 0.0 | 205.5 | 205.5 | | 1999 | 1580.8 | 131.7 | 64.9 | 142.4 | 20300.0 | 0.8 | −0.9 | 0.0 | 394.4 | 394.4 | | 2000 | 1375.6 | 114.6 | 85.0 | 109.4 | 11972.7 | 0.5 | −1.3 | 0.0 | 293.2 | 293.2 | | 2001 | 915.6 | 76.3 | 38.7 | 100.1 | 10016.8 | 1.3 | 0.7 | 0.0 | 291.8 | 291.8 | | 2002 | 1453.8 | 121.2 | 155.1 | 97.7 | 9550.9 | −0.2 | −1.8 | 0.0 | 240.7 | 240.7 | | 2003 | 1423.5 | 118.6 | 95.0 | 110.0 | 12101.4 | 0.9 | −0.5 | 0.7 | 314.0 | 313.3 | | 2004 | 1500.6 | 125.1 | 109.4 | 110.2 | 12157.7 | 0.6 | −0.8 | 0.0 | 322.8 | 322.8 | | 2005 | 1498.8 | 124.9 | 95.7 | 121.3 | 14727.5 | 1.0 | 0.1 | 0.0 | 374.3 | 374.3 | | 2006 | 1033.3 | 86.1 | 62.7 | 96.5 | 9314.4 | 1.2 | 0.7 | 0.4 | 284.6 | 284.2 | | 2007 | 1148.6 | 95.7 | 89.1 | 76.3 | 5820.8 | 0.1 | −1.6 | 0.0 | 208.9 | 208.9 | | 2008 | 1853.5 | 154.5 | 133.6 | 151.0 | 22802.6 | 0.8 | 0.2 | 0.0 | 479.1 | 479.1 | | 2009 | 1617.5 | 134.8 | 139.1 | 109.4 | 11981.1 | 0.1 | −1.7 | 0.0 | 294.7 | 294.7 | | 2010 | 1107.2 | 92.3 | 86.3 | 82.0 | 6729.4 | 0.6 | −0.3 | 0.0 | 244.5 | 244.5 |
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