# Outdoor Comfort

The **Outdoor Comfort** tab shows an overview of the perceived environmental condition based on the UTCI model.

The [Universal Thermal Climate Index](http://www.utci.org/index.php) (UTCI), introduced in 1994, aims to be the measure of human physiological reaction to the atmospheric environment.

<figure><img src="/files/y4FKVaqQW5aBYdtiTIEl" alt=""><figcaption><p>Graphical scheme of the UTCI calculation methodology</p></figcaption></figure>

It considers:

* dry bulb temperature
* mean radiant temperature
* wind speed
* relative humidity

to calculate a reference environmental temperature causing strain when compared to an individual's response to the real environment. It is based on [Fiala et al](https://link.springer.com/article/10.1007/s00484-011-0424-7).'s multi-node model of thermo-regulation.

The [UTCI equivalent temperature](https://doi.org/10.1016/j.wace.2018.01.004) is a function of the above parameters, which are combined in a multinode thermo-physiological model that takes into account clothing insulation and metabolic rate. From this a[Universal Thermal Climate Index](http://www.utci.org/index.php) (UTCI) of perceived thermal stress is derived.

**Clima** allows the user to visualize the annual UTCI equivalent temperature as heatmap under various environmental conditions.

<figure><img src="/files/mUUdNcpDG43lLB0rl0CH" alt=""><figcaption><p>Example: UTCI perceived temperature annual heatmap in 'Sun and Wind' conditions for <strong>Rome, ITA</strong></p></figcaption></figure>

The UTCI temperature can be converted in a scale assessing thermal stress, displayed by **Clima** in a heatmap graph.

<figure><img src="/files/VlrkQ8bevSNPumydioYy" alt=""><figcaption><p>Example: UTCI heat stress index heatmap in 'Sun and Wind' conditions for <strong>Rome, ITA</strong></p></figcaption></figure>

### Video Tutorial

Learn more about the Outdoor Comfort tab by watching the following video.

{% embed url="<https://youtu.be/VJ_wOHadVdw?si=hIa-95u3wpeP6eq0&t=781>" %}


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