It is also found that the most important factors that influence the frost growth are the temperature of cold plate and relative humidity of air.

实验还发现，对霜层生长初期影响最大的两个因素是冷表面的温度和空气的相对湿度。

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Photosynthetic productivity of the leaves is affected by temperature and relative humidity of air as well as directly constrained by intensity of the sunlight.

叶片的光合生产能力直接受光照强度的制约，同时还受气温和空气相对湿度的影响。

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Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.

因为温暖的空气比冷空气能容纳更多的湿气，所以只有当大气中的水蒸气量随着温度的升高而增加时，相对湿度才会保持不变。

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The Met Office's "feels like temperature" takes into account expected air temperature, relative humidity and the strength of the wind at around 5 feet (1.5m) - the typical height of a person's face.

BBC: Who, What, Why: What is wind chill factor?