How is the feels like temperature calculated and why is it different?

The way we measure temperature hasn’t changed much since the invention of the first thermometer in the 16th century.

It was first made by the Italian Santorio Santorio, who was part of a group of Venetian scientists, and applied a scale to an air thermoscope.

Now the Met Office uses a platinum resistance thermometer (PRT) to measure the air temperature at all of their general weather stations that are scattered across the country.

This is in addition to four other traditional liquid-in-glass thermometers. The main PRT is calibrated every eight years to ensure traceability to the national temperature standard.

These methods are very accurate and reliable, but many weather apps now offer a “felt” number.

In the summer months, the temperature can be 30 degrees Celsius but can feel like 35.

Alternatively, it can feel a lot colder in winter than what a thermometer reads.

How is the perceived temperature calculated?

The perceived temperature or the heat index takes other factors into account than just a pure temperature measurement.

It is calculated by combining the expected air temperature, relative humidity, and wind strength at a distance of approximately five feet (the typical height of a human face).

If the temperature stays the same but the wind picks up, it gets colder. In general, the wetter a day is, the warmer it will be for you, even at the same temperature.

Because when the air humidity is high, sweat evaporates longer and the skin temperature rises.

Why does the temperature feel different?

The normal temperature deviates from the heat index because it does not take into account the effects of the weather on the human body.

Meanwhile, “felt” affects the effects of moisture, wind chill, and its strength at the level of the average human face.

The heat index is based on temperatures in the shade. Therefore, the measurement can deliver a significantly lower reading than the equivalent temperature actually perceived by humans when they are outdoors in the sun.


Leave a Comment