Maximum temperature recorded is 48.3 °C (118.9 °F) in May 1944, whereas the minimum temperature recorded is −3.9 °C in January 1929.
The current name was given in 1354 AD, as Hisar-e-Firoza by Firuz Shah Tughlaq, the Sultan of Delhi from 1351 to 1388.
The Ghaggar and Drishadvati Rivers once flowed through the city, but they have now changed their course.
The Municipal Corporation of Hisar, consisting of 20 wards, is headed by a mayor.
Law and order in the city are maintained by Haryana Police, which is headed by Superintendent of Police.
It has an average elevation of 215 m (705 ft) above mean sea level.
The region is part of the alluvial Ghaggar-Yamuna plain and its southern and western portions mark a gradual transition to the desert. According to tectonic map, the district lies on Delhi-Lahore Ridge which is bounded by thrusts and no earthquake of any significance has originated in the zone in the past.Archeological excavations at nearby locations of Rakhigarhi, Siswal, and Lohari Ragho suggest the presence of human habitation from pre-Harappan period.Later, Aryan people settled around Drsadvati River.The festivals of Jains, Christians, Sikhs and Muslims are also celebrated.All the sites are maintained by Archaeological Survey of India. It is situated about 24 km from the city and was once the capital of king Agrasena, who is believed to have lived during the last stages of Dwapar Yuga in the Mahabharat era.The average annual rainfall is around 429 mm (16.9 in), most of which occurs during July and August.