section_path: Geography/Climate
section_name: Climate
paragraph_text: Climate
  
  Mumbai has an extreme tropical wet and dry climate (Aw) under the Köppen climate classification, although the central and northern suburbs have a tropical monsoon climate (Am) with even heavier wet season rainfall. Mumbai has a virtually rainless period extending from October to May and an extremely wet period peaking in July. A cooler season from December to February is followed by a hotter season from March to May. The period from June to about the end of September constitutes the south west monsoon season, and October and November form the post-monsoon season.
  
  Between June and September, the South-west monsoon rains occur in Mumbai. Pre-monsoon showers are received in May. Occasionally, north-east monsoon showers occur in October and November. The maximum annual rainfall ever recorded was 3,452 mm (136 in) for 1954. The highest rainfall recorded in a single day was 944 mm (37 in) on 26 July 2005. The average total annual rainfall is 2,213.4 mm (87 in) for the Island City, and 2,502.3 mm (99 in) for the suburbs.
  
  The average annual temperature is 27 °C (81 °F), and the average annual precipitation is 2,213 mm (87 in). In the Island City, the average maximum temperature is 31 °C (88 °F), while the average minimum temperature is 24 °C (75 °F). In the suburbs, the daily mean maximum temperature range from 29 °C (84 °F) to 33 °C (91 °F), while the daily mean minimum temperature ranges from 16 °C (61 °F) to 26 °C (79 °F). The record high is 42.2 °C (108 °F) set on 14 April 1952, and the record low is 7.4 °C (45 °F) set on 27 January 1962.
  
  Tropical cyclones are rare in the city. The worst cyclone to ever impact Mumbai was the one in 1948 where gusts reached 151 km/h (94 mph) in Juhu. The storm left 38 people dead and 47 missing. The storm reportedly impacted Mumbai for 20 hours and left the city devastated.
  
  Mumbai is prone to monsoon floods, exacerbated by climate change which affects heavy rains and high tide in the sea. According to the World Bank, unplanned drainage system and informal settlement is a key factor of frequent floods in Mumbai. Among other causes of flooding in Mumbai is its geographic location, Mumbai urban is peninsular in form, (a land-filled area that connects seven islands) a low laying area, compared to its suburbs that sit on an elevated location. Over the past few decades, new informal settlements were formed in the suburbs, causing a rapid increase in population, improper waste management, and drainage congestion. The rainwater from these areas heavily flows towards low-lying urban areas consisting of some slums and high-rise buildings. As a result, slums are either swamped, washed away, or collapse causing heavy casualties, and post-flood water logging lasts for a long time that causing blockage of railway lines-(most frequently used public transport in Mumbai), traffic snarl, inundated roads, and sub-merged bylanes. Over the past few decades, the frequency of floods in Mumbai is enormous, the 2005 Mumbai floods are characterised by 500-1000 deaths, household displacements, damaged infrastructure-(including heritage sites), and a financial loss of US$ 1.2 billion. In the process of reducing floods in Mumbai, the Maharashtra government adopted a flood mitigation plan; according to which the drainage system will be restructured, restoration of Mithi River, and re-establishment of informal settlements. Local civic body Brihanmumbai Municipal Corporation (BMC) authorities are assigned to forecast and issue eviction notices while BMC along with NGO's prepare for the evacuation of the residents of those areas to temporary safe camps.