stiflingly  
adverb uk/ˈstaɪ.fəl.ɪŋ.li/ us/ˈstaɪ.fəl.ɪŋ.li/
  (HOT)      
 闷热地,热得令人窒息地
in a way that is extremely hot and unpleasant
  It's stiflingly hot in here. 这里热得令人窒息。 
 Violent storms and stiflingly high temperatures can strain the equipment. 剧烈的风暴和令人窒息的高温会给设备带来很大的压力。 
 - More examples
 - The room was stiflingly hot.
 - On a stiflingly hot night, he stayed cool by covering his head with a wet towel.
 - Avoid June to mid-September when it can be stiflingly humid and rainy.
 - The air was stiflingly still and hot.
 
See: stifling