Solar data for Penman-Monteith

[Samuel Withers]

Hello,

I am attempting to develop the dataset I need to run the Penman-Monteith Method in Wetbud, but I'm not seeing the “All sky normalized insolation clearness index” the NASA POWER source listed in the Wetbud manual. Is there a way to calculate it from these parameters:  

• All Sky Surface Shortwave Downward Irradiance
• Clear Sky Surface Shortwave Downward Irradiance
• All Sky Surface Shortwave Downward Direct Normal Irradiance
• All Sky Surface Shortwave Diffuse Irradiance
• All Sky Surface Albedo
• Top-Of-Atmosphere Shortwave Downward Irradiance
• Cloud Amount
• All Sky Surface Photosynthetically Active Radiation (PAR) Total
• Clear Sky Surface Photosynthetically Active Radiation (PAR) Total
• All Sky Surface UVA Irradiance
• All Sky Surface UVB Irradiance
• All Sky Surface UV Index

Thank you!

[Agioutantis, Zach]

The clear sky Insolation Data are available as per below

 

 

 

There are default parameters available but you can enter your own

 

 

I hope that helps

Zach Agioutantis

 

From: wetbu...@googlegroups.com <wetbu...@googlegroups.com> On Behalf Of Samuel Withers
Sent: Thursday, March 12, 2026 2:08 PM
To: Wetbud Plus Technical Support <wetbu...@googlegroups.com>
Subject: [WetbudPlus] Solar data for Penman-Monteith

 

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