Analysis of Global Solar Irradiance over Climatic Zones in Nigeria for Solar Energy Applications

Table 3

Monthly mean and coefficient of variation (COV) of global solar irradiance for the climatic zones.

Tropical rainforest
Months	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
Means	19.88	20.4	19.98	18.97	17.68	15.89	14.16	13.83	14.73	16.49	18.52	19.37
COV	0.12	0.11	0.12	0.12	0.13	0.15	0.16	0.17	0.16	0.14	0.12	0.12
Guinea savannah
Months	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
Means	20.81	21.6	21.73	20.67	19.31	17.65	16.05	15.12	16.44	18.26	20.35	20.55
COV	0.11	0.1	0.1	0.11	0.12	0.13	0.14	0.15	0.14	0.12	0.11	0.11
Sahel savannah
Months	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
Means	20.32	22.9	24.5	24.64	23.71	22.82	20.54	19.2	20.66	21.22	20.56	19.29
COV	0.09	0.08	0.08	0.08	0.08	0.08	0.09	0.1	0.1	0.09	0.09	0.1
Sudan savannah
Months	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
Means	20.31	22.6	23.73	23.55	22.55	21.56	19.43	18.16	19.89	20.99	20.96	19.83
COV	0.1	0.08	0.08	0.08	0.08	0.08	0.09	0.1	0.09	0.09	0.09	0.09
Mangrove swamp forest
Months	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
Means	19.61	19.9	18.58	17.59	16.26	14.14	12.54	12.84	13.23	14.64	16.88	18.7
COV	0.13	0.13	0.14	0.15	0.16	0.2	0.21	0.21	0.19	0.18	0.16	0.14