Research Article
Statistical Analysis of Rainfall Trend for Volta Region in Ghana
Table 4
Descriptive statistics of annual rainfall of middle zone.
| | Year | Parameters | | Annual (mm) | Mean (mm) | Median (mm) | S.D. (mm) | Variance (mm) | Skewness | Kurtosis | Min (mm) | Max (mm) | Range (mm) |
| | 1981 | 1346.7 | 112.2 | 95.7 | 94.9 | 9013.6 | 1.4 | 1.4 | 0.0 | 319.8 | 319.8 | | 1982 | 1141.2 | 95.1 | 90.5 | 61.5 | 3788.0 | 1.1 | 0.6 | 30.7 | 230.1 | 199.4 | | 1983 | 1010.2 | 84.2 | 90.5 | 66.9 | 4482.4 | −0.1 | −2.1 | 0.0 | 163.4 | 163.4 | | 1984 | 1337.2 | 111.4 | 120.9 | 92.0 | 8470.2 | 0.1 | −1.4 | 0.0 | 265.7 | 265.7 | | 1985 | 1338.4 | 111.5 | 125.3 | 78.7 | 6202.6 | 0.4 | 1.0 | 2.8 | 283.6 | 280.8 | | 1986 | 1228.1 | 102.3 | 108.8 | 76.5 | 5855.3 | 0.0 | −1.4 | 0.0 | 212.7 | 212.7 | | 1987 | 1409.0 | 117.4 | 122.0 | 89.5 | 8021.7 | 0.1 | −1.1 | 7.7 | 254.1 | 246.4 | | 1988 | 1382.2 | 115.2 | 109.2 | 65.7 | 4319.9 | 0.1 | −1.3 | 21.4 | 223.1 | 201.7 | | 1989 | 1408.5 | 117.4 | 130.8 | 101.9 | 10382.0 | 0.8 | 1.0 | 0.0 | 346.4 | 346.4 | | 1990 | 1167.7 | 97.3 | 109.3 | 71.7 | 5143.3 | 0.4 | −0.8 | 14.6 | 224.7 | 210.1 | | 1991 | 1415.2 | 117.9 | 102.4 | 93.3 | 8708.8 | 0.8 | 0.7 | 3.1 | 325.4 | 322.3 | | 1992 | 808.1 | 67.3 | 66.4 | 48.7 | 2380.7 | 0.3 | −0.1 | 0.0 | 164.2 | 164.2 | | 1993 | 1184.8 | 98.7 | 94.8 | 57.5 | 3308.8 | 0.0 | −0.2 | 0.0 | 204.2 | 204.2 | | 1994 | 990.0 | 82.5 | 66.0 | 69.9 | 4887.3 | 1.2 | 1.1 | 0.0 | 239.9 | 239.9 | | 1995 | 1315.0 | 109.6 | 119.6 | 71.8 | 5166.8 | −0.2 | −1.3 | 0.0 | 209.8 | 209.8 | | 1996 | 1333.8 | 111.2 | 86.4 | 86.7 | 7526.9 | 0.9 | 0.2 | 5.1 | 282.9 | 277.8 | | 1997 | 1322.7 | 110.2 | 95.9 | 79.4 | 6314.1 | 0.3 | −1.2 | 13.7 | 248.6 | 234.9 | | 1998 | 1140.3 | 95.0 | 89.8 | 67.2 | 4524.6 | 0.8 | 0.6 | 0.3 | 242.4 | 242.1 | | 1999 | 1747.6 | 145.6 | 119.5 | 113.3 | 12859.2 | 0.7 | −0.1 | 0.5 | 374.4 | 373.9 | | 2000 | 1220.8 | 101.7 | 94.8 | 70.4 | 4967.6 | 0.2 | −1.6 | 10.6 | 194.8 | 184.2 | | 2001 | 1076.4 | 89.7 | 84.1 | 73.0 | 5338.1 | 0.1 | −1.5 | 0.0 | 192.9 | 192.9 | | 2002 | 1300.3 | 108.4 | 119.4 | 61.8 | 3822.2 | −0.5 | −1.3 | 6.7 | 175.3 | 168.6 | | 2003 | 1289.4 | 107.5 | 79.2 | 92.4 | 8550.8 | 1.2 | 1.3 | 10.6 | 324.9 | 314.3 | | 2004 | 1468.5 | 122.4 | 102.3 | 124.0 | 15380.9 | 2.0 | 4.5 | 3.9 | 454.2 | 450.3 | | 2005 | 1148.7 | 95.7 | 68.6 | 55.8 | 3121.1 | 0.5 | −1.5 | 41.2 | 185.6 | 144.4 | | 2006 | 1161.7 | 96.8 | 69.7 | 88.5 | 7835.3 | 1.2 | 0.8 | 5.0 | 289.2 | 284.2 | | 2007 | 1491.7 | 124.3 | 125.4 | 90.1 | 8120.3 | 0.1 | −1.1 | 0.2 | 262.0 | 261.8 | | 2008 | 1551.5 | 129.3 | 141.1 | 78.7 | 6198.5 | −0.3 | −1.1 | 0.0 | 239.0 | 239.0 | | 2009 | 1106.6 | 92.2 | 87.4 | 66.5 | 4425.1 | 0.6 | −0.2 | 0.0 | 224.0 | 224.0 | | 2010 | 1324.4 | 110.4 | 96.9 | 78.6 | 6192.1 | 0.2 | −1.6 | 6.0 | 227.0 | 221.0 | | 2011 | 1168.8 | 116.9 | 133.3 | 57.3 | 3286.7 | −0.8 | 0.7 | 0.0 | 197.2 | 197.2 |
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