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Table 2 Magnitude and frequency of drought events for spring, summer and annual timescale

From: Analysis of meteorological droughts in the Lake’s Region of Ethiopian Rift Valley using reconnaissance drought index (RDI)

Seasons Drought magnitude Total number of drought months
Arbaminch Arsi Negelle Butajira Halaba Hawassa Kulumsa Melkassa Woliata Wondo Genet Ziway
Spring Mild 15 15 12 12 6 15 12 21 18 12
Moderate 6 6 6 6 12 6 12 9 9 15
Severe 9 12 3 9 3 6 3 0 3 6
Extreme 0 0 6 0 3 3 3 3 3 0
Total 30 33 27 27 24 30 30 33 33 33
Summer Mild 9 12 12 21 12 18 9 18 12 9
Moderate 6 12 3 6 18 0 6 6 9 9
Severe 3 9 3 0 3 6 0 3 3 3
Extreme 3 3 6 3 0 3 6 3 3 3
Total 21 36 24 30 33 27 27 30 27 24
Annual Mild 96 12 12 60 36 72 48 72 60 84
Moderate 24 48 12 48 36 48 36 12 36 36
Severe 24 36 0 0 12 0 12 0 12 36
Extreme 0 24 36 12 24 12 12 12 24 12
Total 144 120 60 120 108 132 108 96 132 168