What about cloudy days and rainy days and the probability?

The probability refers to the complete day, i.e. to see clouds (or rain) all day, you must set the probability to 100%. If the probability is set to e.g. 50%, the SunRiser will literally flip a coin every day and if it is heads there will be clouds. It is still possible that the amount of clouds or rain on these days may be very low to almost non-existent.

Save energy!
Save energy!
Find out how LEDaquaristik lighting contributes noticeably to saving energy.