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Table 9 Variability and trends in mean water level of Lake Hayk (2011–2015)

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

Minimum

(m)

Maximum

(m)

Mean

(m)

SD

CV

(%)

P values

(2 tailed)

Sen’s slope

Jan

0.16

0.72

0.44

0.22

48.92

0.046*

 − 0.13

Feb

0.04

0.56

0.33

0.20

60.45

0.046*

 − 0.12

Mar

0.68

1.89

1.22

0.50

40.57

0.046*

 − 0.32

Apr

0.02

2.19

1.26

0.83

65.76

0.027*

 − 0.49

May

0.49

1.58

0.92

0.43

46.86

0.027*

 − 0.15

Jun

0.15

1.01

0.61

0.33

54.35

0.046*

 − 0.21

Jul

0.51

2.46

1.51

0.76

50.00

0.027*

 − 0.47

Aug

1.20

2.56

1.91

0.56

29.08

0.027*

 − 0.37

Sep

0.52

2.35

1.45

0.71

48.99

0.027*

 − 0.44

Oct

0.15

1.76

1.04

0.62

59.18

0.046*

 − 0.39

Nov

0.62

1.63

1.06

0.42

39.34

0.046*

 − 0.27

Dec

0.19

1.38

0.83

0.46

55.43

0.046*

 − 0.29

Kiremt

0.85

2.09

1.37

0.52

38.02

0.027*

 − 0.34

Belg

0.76

1.71

1.13

0.41

36.28

0.027*

 − 0.27

Bega

0.58

1.58

1.04

0.40

38.39

0.027*

 − 0.25

Annual

0.57

1.34

1.05

0.43

41.04

0.027*

 − 0.28

  1. *Statistically significant (P ≤ 0.05)