Guidelines in the Guide to Meteorological Instruments and Methods of Observation (the CIMO guide) of the World Meteorological Organization (WMO, published 2014, updated 2017, section 2.1.3.3, Response times of thermometers) recommend that the 63% response time τ for an air temperature sensor be 20 s, although – as airflow speed influences response time – the minimum airflow speed at which this applies should also be specified in the document. A 63% response time τ₆₃ = 20 s implies that 95% of a step change be registered within 3τ₆₃ or 60 s, the WMO recommended averaging interval for air temperature: rapid air temperature changes on this time‐scale are not uncommon, often associated with convective squalls, frontal systems or sea breeze circulations. An alternative way of expressing the effect of the time constant is that in air whose temperature is changing at 0.1 K·min⁻¹ the thermometer would lag by approximately 0.03 K.

中文翻译：

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气象空气温度传感器的响应时间

指南中指南气象仪器与观测方法的世界气象组织（CIMO指南）（WMO，公布2014年，2017年更新，部分2.1.3.3，温度计的响应时间），建议将63％的响应时间τ为空气温度传感器为20 s，尽管–由于气流速度会影响响应时间–在文档中也应指定适用的最小气流速度。A 63％响应时间τ ₆₃  = 20秒意味着一个阶跃变化的95％之内3注册τ ₆₃WMO建议的平均气温间隔时间为60或60 s：在此时间范围内，气温快速变化并不罕见，通常与对流性骚动，额叶系统或海风环流有关。表示时间常数影响的另一种方法是，在温度变化为0.1 K·min ^-1的空气中，温度计的温度会滞后约0.03K。