<p>We can use the aridity index <span class="math-container">$\left ( ai = \dfrac{P}{PET} \right )$</span> to define arid areas. Hyperarid areas have <span class="math-container">$ai &lt; 0.05$</span>. Is there a similar threshold for hyper-humid regions?</p>
<p>Would it be 20 (inverse of the threshold for hyperarid)?</p>

CC BY-SA 4.0
2022-10-18T16:49:04.200Z
You might want to give a source for your aridity index and what the variables stand for, as it's not something used in broader meteorology/climatology too heavily I don't believe.
JeopardyTempest
CC BY-SA 4.0
2022-10-19T10:31:56.377Z
It certainly wouldn't be 20 as the aridity index defined that way (annual precipitation divided by potential evapotranspiration) is necessarily between 0 and 1.
David Hammen
CC BY-SA 4.0
2022-10-19T11:37:18.177Z
@DavidHammen That doesn't sounds right, there are plenty of places where P > PET, e.g., cloudy tropics: https://www.nature.com/articles/s41597-022-01493-1/figures/2
Deditos
<climate><humidity><evapotranspiration>
What is the definition for a hyper-humid area?
Pedro Alencar
# What is the definition for a hyper-humid area?

(Asked by: username_0 on 2022-10-18)

We can use the aridity index $\left ( ai = \dfrac{P}{PET} \right )$ to define arid areas. Hyperarid areas have $ai < 0.05$. Is there a similar threshold for hyper-humid regions?

Would it be 20 (inverse of the threshold for hyperarid)?

**Tags:** climate, humidity, evapotranspiration

> **Comments:**
> **username_1**: You might want to give a source for your aridity index and what the variables stand for, as it's not something used in broader meteorology/climatology too heavily I don't believe.  
> **username_2**: It certainly wouldn't be 20 as the aridity index defined that way (annual precipitation divided by potential evapotranspiration) is necessarily between 0 and 1.  
> **username_3**: @username_2 That doesn't sounds right, there are plenty of places where P > PET, e.g., cloudy tropics: https://www.nature.com/articles/s41597-022-01493-1/figures/2  

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