The NWS Web site features a handy on-line calculator for determining the heat index based on a combination of either temperature and relative humidity or temperature and dew point.
The wide environment system consists of ambient, clothing and human, in which the clothing comfort is influenced by temperature and relate humidity and other physical index of ambient.
环境、服装、人体是一个统一系统，环境中温湿度以及其他物理指标的变化对人体着装舒适性产生显著影响。
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In summer what is called the 'comfort index' takes over, combining temperature with humidity to prove that getting the central air conditioning replaced last year really was worth the money.