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Table 3 Variability and trend tests of precipitation (1986–2015)

From: Climate variability and trends in the Endorheic Lake Hayk basin: implications for Lake Hayk water level changes in the lake basin, Ethiopia

Time period

Min

(mm)

Max

(mm)

Mean

(mm)

Contribution

(%)

SD

CV

(%)

P values

(2 tailed)

Sen’s slope

Jan

0.00

119.10

27.90

2.34

32.28

115.68

0.943

0.000

Feb

0.00

192.50

50.08

4.20

57.74

115.28

0.005*

 − 2.716

Mar

0.00

259.70

103.92

8.72

60.52

58.24

0.521

 − 1.082

Apr

2.20

246.10

94.93

7.96

59.95

63.15

0.498

 − 1.150

May

1.00

219.72

74.50

6.25

66.38

89.11

0.887

0.418

Jun

0.00

143.20

34.89

2.93

33.80

96.87

0.411

0.509

Jul

40.00

544.90

298.14

25.01

112.00

37.57

0.134

3.150

Aug

97.60

617.60

296.27

24.85

93.92

31.70

0.521

1.250

Sep

44.40

237.20

123.68

10.37

51.35

41.52

0.006*

 − 2.727

Oct

0.00

161.50

41.17

3.45

37.76

91.72

0.232

0.636

Nov

0.00

133.80

26.09

2.19

34.25

131.30

0.029*

0.264

Dec

0.00

77.40

20.74

1.74

27.73

133.68

0.621

0.000

Kiremt

411.30

1218.60

752.98

63.15

179.24

23.80

0.544

2.189

Belg

63.90

515.11

273.35

22.93

120.11

43.94

0.915

 − 0.457

Bega

24.00

339.90

165.98

13.92

78.77

47.46

0.06

 − 2.200

Annual

827.10

1835.30

1192.31

100.00

198.69

16.66

0.372

 − 3.394

  1. *Statistically significant (P ≤ 0.05)