Average Monthly energy from solar Insolation for Gujranwala

Estimated Energy Delivered by a 1-kW (dc, STC) PV Array in Gujranwala, Using Average Maximum Monthly Temperatures to Compute Performance Degradation.

Monthly Temperature for Gujranwala:

It was considered that with every increase in 1C temp, dc power decreases by .5%

Month	Insolation (kWh/m^2-day)	Avg Max Temp(◦C)	Cell Temp .(◦C)	Array dc Power (kW)	Array ac Power (kW)	Energy (kWh/mo)
January	2.6	19.1	52.85	0.86075	0.721377	684.58711
February	3.76	22.1	55.85	0.84575	0.708806	972.76557
March	5.05	27.4	61.15	0.81925	0.686597	1265.57
April	6.01	33.7	67.45	0.78775	0.660198	1448.2423
May	7.13	39	72.75	0.76125	0.637988	1660.3329
June	6.99	40.8	74.55	0.75225	0.630446	1608.4876
July	6.47	36.1	69.85	0.77575	0.650141	1535.3394
August	5.88	34.6	68.35	0.78325	0.656426	1408.8218
September	5.57	35	68.75	0.78125	0.65475	1331.1395
October	4.75	33	66.75	0.79125	0.663131	1149.703
November	3.65	27	60.75	0.82125	0.688273	916.95197
December	2.9	21.2	54.95	0.85025	0.712578	754.2633

Refrences:

Solar Insolation: http://www.synergyenviron.com/tools/solar_insolation.asp?loc=Gujranwala

Temperature:  http://en.wikipedia.org/wiki/Gujranwala