How to calculate the daily average radiation

The daily average radiation is measured for the hours the sun is up. It is up for discussion to take into account the first and last hours, because these hours often don't contribute fully to the average. Similar to the hourly radiation, the radiation values have to be multiplied:

$radiation_{daily}={\frac {\sum _{t=n}^{m}Q_{t}}{m-n+1}}\cdot 10000/3600$,

where:

$n$ is the first full hour with sun radiation

$m$ is the last full hour with sun radiation.

See also

• Daily avg radiation (Heat Overlay)
• KNMI weather data