Peshawar under Koppen's climate classification features a semi-arid climate with very hot summers and mild winters. "Winter" in Peshawar, starts in mid November and ends in late March. Summer months are May to September. The mean maximum temperature in summer is over 40 °C (104 °F) and the mean minimum temperature is 25 °C (77 °F). The mean minimum temperature during winter is 4 °C (39 °F) and maximum is 18.35 °C (65.03 °F).
Peshawar is not a monsoon region, unlike other parts of Pakistan. But still rainfall is received both in winter and in the summer. The winter rainfall due to western disturbances shows a higher record during the months of February and April. The highest winter rainfall of 236 millimetres (9.3 in) has been recorded in February 2007 while the highest summer rainfall of 402 millimetres (15.8 in) has beenrecorded in the month of July 2010 in which a recordbreaking rain of 274 millimetres (10.8 in) fell during 24 hours on July 29, 2010,previously 187 mm (7.36inches) of rain was recorded in April 2009.
The average winter rainfall is higher than that of the summer. Based on a 30-year record, the average 30-year annual precipitation has been recorded as 400 millimetres (16 in).The highest annual rainfall of 904.5 millimetres (35.61 in) has been recorded in 2003 . Wind speeds vary during the year from 5 knots (5.8 mph; 9.3 km/h) in December to 24 knots (28 mph; 44 km/h) in June. The relative humidity varies from 46% in June to 76% in August.The highest temperature of 50 °C (122 °F) has been recorded on June 18, 1995.While the lowest −3.9 °C (25 °F) occurred on January 7, 1970.
Peshawar's environment has suffered tremendously due to an ever increasing population, unplanned growth and a poor regulatory framework. Air and noise pollution is a significant issue in several parts of the city, and the water quality, once considered to be exceptionally good, is also fast deteriorating.In addition the city has lost 2,700 acres (1,100 ha) of agriculture land during the two decades (1965–85). This in the addition to 400 acres (160 ha) of vacant land that has been also eaten up by expending urban functions. In the same period, the land under parks and green space has shrunk from 163–75 acres (66–30 ha)