Daily cloud-modified erythemal UV index for The Netherlands

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UV archive
overview

Clear-sky UV index:   erythemal == regular archive maps & data
 
 
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Date range:
11 Feb 2025
-- 12 Oct 2025

 
Related RIVM pages (in Dutch):
> representation of this data with a clickable map
> measurements of today's UV index in Bilthoven

 

Comparison with ground-based measurements
at RIVM and KNMI

Comparison of the cloud-modified UV index with RIVM and KNMI UV index measurements is based on the higher resolution (0.05 by 0.05°) data using the location of 'De Bilt' for both institutes and is available up to yesterday.
 
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Comparison for 17 August 2025

(click on image to enlarge)
Comparison with RIVM data Comparison with KNMI data
UV index comparison with RIVM data UV index comparison with RIVM data
Sources of differences:
 >  Variation of cloudiness in space and time
 >  Ozone column value
 >  Presence of aerosols
 >  Measurement times
 >  Grid cell selection
 >  . . .
 
<=== Return to the Cloud-modified UV index monitoring page 		 

 

last modified: 13 October 2025
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