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

Environmental Systems Research

Table 5 Variability and trend tests of mean temperature (1986–2015)

Time period	Min (°C)	Max (°C)	Mean (°C)	SD	CV (%)	P values (2 tailed)	Sen’s slope
Jan	14.13	17.18	15.81	0.71	4.49	0.153	0.024
Feb	15.41	18.32	17.17	0.86	5.01	0.108	0.031
Mar	16.59	20.25	18.22	0.94	5.16	0.008*	0.059
Apr	16.90	22.06	18.93	1.05	5.55	0.038*	0.049
May	17.53	21.82	19.68	1.26	6.40	0.284	0.035
Jun	17.69	21.58	19.75	1.19	6.03	0.544	0.021
Jul	16.83	19.50	18.22	0.56	3.07	0.643	0.007
Aug	17.10	18.81	17.97	0.43	2.39	0.002*	0.029
Sep	16.58	18.07	17.31	0.40	2.31	0.001*	0.030
Oct	15.56	18.18	16.65	0.57	3.42	0.032*	0.028
Nov	14.14	17.48	15.96	0.87	5.45	0.164	0.030
Dec	13.91	16.96	15.31	0.91	5.94	0.721	− 0.011
Kiremt	17.56	19.19	18.31	0.43	2.34	0.042*	0.020
Belg	17.13	20.86	18.94	0.91	4.82	0.020*	0.045
Bega	15.35	17.37	16.18	0.50	3.08	0.046*	0.022
Annual	16.65	18.54	17.58	0.43	2.45	0.004*	0.026