Hi,
thank you for your post.
I do not know what ” then solar radiation is low or very low” translates to. In the case of fuzzylite, I would split the rule into two:
if Temperature is low and humidity is low then solar radiation is low
if Temperature is low and humidity is low then solar radiation is very low
The consequents will be aggregated using the aggregation S-Norm, in the case of fuzzylite.
Cheers.