During the summer, temperatures in Houston commonly reach over 90 °F (32 °C). The city reaches or surpasses this temperature on an average of 106.5 days per year, including a majority of days from June to September; additionally, an average of 4.6 days per year reach or exceed 100 °F (38 °C).[73] Houston's characteristic subtropical humidity often results in a higher apparent temperature, and summer mornings average over 90% relative humidity.[74] Air conditioning is ubiquitous in Houston; in 1981, annual spending on electricity for interior cooling exceeded $600 million (equivalent to $1.65 billion in 2018), and by the late 1990s, approximately 90% of Houston homes featured air conditioning systems.[75][76] The record highest temperature recorded in Houston is 109 °F (43 °C) at Bush Intercontinental Airport, during September 4, 2000, and again on August 27, 2011.[73]
During the summer, temperatures in Houston commonly reach over 90 °F (32 °C). The city reaches or surpasses this temperature on an average of 106.5 days per year, including a majority of days from June to September; additionally, an average of 4.6 days per year reach or exceed 100 °F (38 °C).[73] Houston's characteristic subtropical humidity often results in a higher apparent temperature, and summer mornings average over 90% relative humidity.[74] Air conditioning is ubiquitous in Houston; in 1981, annual spending on electricity for interior cooling exceeded $600 million (equivalent to $1.65 billion in 2018), and by the late 1990s, approximately 90% of Houston homes featured air conditioning systems.[75][76] The record highest temperature recorded in Houston is 109 °F (43 °C) at Bush Intercontinental Airport, during September 4, 2000, and again on August 27, 2011.[73]

