Query: At four degrees, the deadly European heat wave of 2003, which killed as many as 2,000 people a day, will be a normal summer.

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List of heat waves <=SEP=> This is a partial list of significant heat waves , listed in order of occurrence .

2019 heat wave in India and Pakistan <=SEP=> From mid-May to mid-June 2019, India and Pakistan had a severe heat wave. It was one of the hottest and longest heat waves since the two countries began recording weather reports. The highest temperatures occurred in Churu, Rajasthan, reaching up to 50.8 °C (123.4 °F), a near record high in India, missing the record of 51.0 °C (123.8 °F) set in 2016 by a fraction of a degree. As of 12 June 2019, 32 days are classified as parts of the heatwave, making it the second longest ever recorded.As a result of hot temperatures and inadequate preparation, more than 184 people died in the state of Bihar, with many more deaths reported in other parts of the country. In Pakistan, five infants died after extreme heat exposure.The heat wave coincided with extreme droughts and water shortages across India and Pakistan. In mid-June, reservoirs that previously supplied Chennai ran dry, depriving millions. The water crisis was exacerbated by high temperatures and lack of preparation, causing protests and fights that sometimes led to killing and stabbing.

2006 North American heat wave <=SEP=> The 2006 North American heat wave spread throughout most of the United States and Canada beginning on July 15 , 2006 , killing at least 225 people . That day the temperature reached 117 ° F ( 47 ° C ) in Pierre , South Dakota , with many places in South Dakota that hit well into the 120s . In early reports from this heat wave , at least three died in Philadelphia , Arkansas , and Indiana . In Maryland , the state health officials reported that three people died of heat-related causes . Another heat related death was suspected in Chicago .   Although many heat related deaths go unreported , by July 19 , the Associated Press reported that the soaring heat was blamed for 12 deaths from Oklahoma City to the Philadelphia area . Reports by early morning July 20 raised the death toll to at least 16 in seven states .   This period of heat also saw a wind storm ( derecho ) in St. Louis that caused widespread power outages , including for cooling centers designed to provide relief for those suffering from the heat . In addition , places on the West Coast , like California 's Central Valley and Southern California experienced humid heat , which is unusual for the area .

Cold wave <=SEP=> A cold wave ( known in some regions as a cold snap ) is a weather phenomenon that is distinguished by a cooling of the air . Specifically , as used by the U.S. National Weather Service , a cold wave is a rapid fall in temperature within a 24-hour period requiring substantially increased protection to agriculture , industry , commerce , and social activities . The precise criterion for a cold wave is determined by the rate at which the temperature falls , and the minimum to which it falls . This minimum temperature is dependent on the geographical region and time of year .   In the United States , a cold spell is defined as the national average high temperature dropping below 20 F.