Research Article
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 |
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