Sindh is divided into three climatic regions: Siro (the
upper region, centred on Jacobabad), Wicholo (the middle region, centred on Hyderabad),
and Lar (the lower region, centred on Karachi). The thermal equator passes
through upper Sindh, where the air is generally very dry. Central Sindh's
temperatures are generally lower than those of upper Sindh but higher than
those of lower Sindh. Dry hot days and cool nights are typical during the
summer. Central Sindh's maximum temperature typically reaches 43–44 °C
(109–111 °F). Lower Sindh has a damper and humid maritime climate affected
by the southwestern