Insolation is the spot measure of solar radiation that finally reaches that particular surface of the earth. Also known as Incident Solar Energy. The popular expression of Insolation is kilowatt-hours per square metre per day (kWh/m2/day). Since it is a measure of the solar energy incident on a given area over a specific period of time therefore also measured by the amount of solar energy received per square centimetre per minute.
Insolation Data of Few Cities:
| City / Month | kWh/m2/day |
|---|---|
| ISLAMABAD | |
| January | 2.82 |
| February | 3.31 |
| March | 4.76 |
| April | 5.83 |
| May | 7.09 |
| June | 7.29 |
| July | 6.67 |
| August | 5.71 |
| September | 5.44 |
| October | 4.61 |
| November | 3.44 |
| December | 2.57 |
| Annual Average | 4.962 |
| LAHORE | |
| January | 2.78 |
| February | 3.92 |
| March | 5.12 |
| April | 6.1 |
| May | 7.13 |
| June | 6.91 |
| July | 6.31 |
| August | 5.69 |
| September | 5.43 |
| October | 4.78 |
| November | 3.74 |
| December | 3.02 |
| Annual Average | 5.078 |
| KARACHI | |
| January | 4.07 |
| February | 4.95 |
| March | 5.97 |
| April | 6.24 |
| May | 6.62 |
| June | 5.8 |
| July | 4.9 |
| August | 4.74 |
| September | 5.42 |
| October | 5.3 |
| November | 4.3 |
| December | 3.81 |
| Annual Average | 5.177 |
| PESHAWAR | |
| January | 2.68 |
| February | 3.29 |
| March | 4.68 |
| April | 5.71 |
| May | 6.77 |
| June | 7.21 |
| July | 6.98 |
| August | 6.15 |
| September | 5.45 |
| October | 4.56 |
| November | 3.29 |
| December | 2.53 |
| Annual Average | 4.942 |
| QUETTA | |
| January | 3.47 |
| February | 4.24 |
| March | 5.62 |
| April | 6.6 |
| May | 7.53 |
| June | 7.89 |
| July | 7.56 |
| August | 7.19 |
| September | 6.52 |
| October | 5.56 |
| November | 4.08 |
| December | 3.35 |
| Annual Average | 5.801 |
| FAISALABAD | |
| January | 2.83 |
| February | 3.89 |
| March | 5.22 |
| April | 6.02 |
| May | 7.01 |
| June | 6.92 |
| July | 6.62 |
| August | 5.91 |
| September | 5.57 |
| October | 4.82 |
| November | 3.7 |
| December | 3.04 |
| Annual Average | 5.129 |
| NOWSHERA | |
| January | 2.67 |
| February | 3.29 |
| March | 4.7 |
| April | 5.77 |
| May | 6.9 |
| June | 7.33 |
| July | 7 |
| August | 6.13 |
| September | 5.55 |
| October | 4.6 |
| November | 3.32 |
| December | 2.5 |
| Annual Average | 4.98 |
| HYDERABAD | |
| January | 4.08 |
| February | 4.88 |
| March | 5.94 |
| April | 6.24 |
| May | 6.96 |
| June | 6.48 |
| July | 5.87 |
| August | 5.73 |
| September | 5.97 |
| October | 5.21 |
| November | 4.21 |
| December | 3.79 |
| Annual Average | 5.447 |
| MULTAN | |
| January | 3.27 |
| February | 4.1 |
| March | 5.41 |
| April | 6.02 |
| May | 6.89 |
| June | 7.04 |
| July | 6.85 |
| August | 6.47 |
| September | 5.79 |
| October | 5.01 |
| November | 3.86 |
| December | 3.25 |
| Annual Average | 5.33 |
| ABBOTABAD | |
| January | 2.62 |
| February | 3.08 |
| March | 4.43 |
| April | 5.64 |
| May | 7.01 |
| June | 7.18 |
| July | 6.51 |
| August | 5.74 |
| September | 5.21 |
| October | 4.54 |
| November | 3.38 |
| December | 2.39 |
| Annual Average | 4.811 |
| MARDAN | |
| January | 2.59 |
| February | 3.24 |
| March | 4.6 |
| April | 5.78 |
| May | 7.05 |
| June | 7.4 |
| July | 7.07 |
| August | 6.21 |
| September | 5.56 |
| October | 4.54 |
| November | 3.3 |
| December | 2.43 |
| Annual Average | 4.981 |
| GUJRANWALA | |
| January | 2.6 |
| February | 3.76 |
| March | 5.05 |
| April | 6.01 |
| May | 7.13 |
| June | 6.99 |
| July | 6.47 |
| August | 5.88 |
| September | 5.57 |
| October | 4.75 |
| November | 3.65 |
| December | 2.9 |
| Annual Average | 5.063 |
| GUJRAT | |
| January | 2.59 |
| February | 3.63 |
| March | 4.95 |
| April | 6.01 |
| May | 7.18 |
| June | 7.09 |
| July | 6.61 |
| August | 5.9 |
| September | 5.56 |
| October | 4.67 |
| November | 3.59 |
| December | 2.82 |
| Annual Average | 5.05 |