Estimation of Clear Sky Normal Irradiance over Northern Nigeria Atmosphere

Table 3.

Range of standard deviation for all stations.

Year Range of rad_mb Range of rad_md

JAN 1 .0 - 2.0 0.2 - 0.3
FEB 1.5 - 3.5 0.3 - 0.6
MAR 3.2 - 18.7 1.0 - 11.3
APR 3.0 - 16.8 0.5 - 8.5
MAY 1.5 - 23.2 0.1 - 11.5
JUN 18.0 - 19.2 0.4 - 9.6
JUL 0.7 - 16.4 0.1 - 8.3
AUG 0.7 - 27.5 0.1 - 14.9
SEP 0.6 - 22.0 0.1 - 11.1
OCT 0.8 - 19.4 0.1 - 10.4
NOV 1.0 - 7.0 0.2 - 0.9
DEC 0.9 - 25.8 0.2 - 13.9