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Table 1 Summary of monthly rainfall statistics (data base 1981–2020)

From: The impact of rainfall variability and crop production on vertisols in the central highlands of Ethiopia

Months

Mean rainfall (mm)

Standard deviation

CV (%)

Maximum rainfall (mm)

Minimum rainfall (mm)

Range (mm)

January

24.3

24.4

120.2

98.9

0.0

98.9

February

41.8

41.7

113.4

194.9

0.0

194.9

March

76.5

67.4

91.8

188.5

0.0

188.5

April

94.9

50.4

56.7

240.5

12.3

228.2

May

95.7

49.8

55.5

179.7

4.7

175.3

June

157.2

46.1

31.3

253.2

62.2

191.2

July

173.9

50.4

21.5

403.3

158.8

244.5

August

242.1

49.1

21.9

330.1

149.9

180.2

September

126.7

44.1

33.2

208.1

48.0

160.1

October

37.1

37.7

104.8

157.6

0.5

157.1

November

19.5

21.9

162.2

83.6

0.0

83.6

December

9.9

16.3

206.7

68.3

0.0

68.3

Annual

1099.6

78.3

85.3

2406.6

436.4

1970.2