Summer (mid May to late September) is hot, moderately dry, and sunny with a July and August having an average high of 33 °C (91 °F). The average depth of snow coverage is 2 to 4 cm (1 to 2 in), and the maximum is normally 6 to 13 cm (2 to 5 in), but some winters coverage can reach 70 cm (28 in) or more. The days are mild and relatively warm in mid spring.Plovdiv sometimes experiences very hot days which are typical in the interior of the country. Autumn starts in late September; days are long and relatively warm in early autumn. The average January temperature is −0.4 °C (31 °F). The average relative humidity is 73% and is highest in December at 86% and lowest in August at 62%.Numerous nations have left their traces on the twelve-metre-thick (39-foot) cultural layers of the city.
The city has historically developed on seven syenite hills, some of which are 250 metres (820 feet) high.
The total precipitation is 540 mm (21.26 in) and is fairly evenly distributed throughout the year.
The wettest months of the year are May and June, with an average precipitation of 66.2 mm (2.61 in), and the driest month is August, with an average precipitation of 31 mm (1.22 in).
(39 sq mi), less than 0.1% of Bulgaria's total area.
It is the most densely populated city in Bulgaria, with 3,769 inhabitants per km². At the beginning of the 20th century, there were seven syenite hills, but one (Markovo tepe) was destroyed.