YOU SAID:
Because it is blue, I assume it is not raining
INTO JAPANESE
青なので雨が降っていないと思います
BACK INTO ENGLISH
I think that it is not raining because it is blue
INTO JAPANESE
青なので雨は降っていないと思います
BACK INTO ENGLISH
I think that it is not raining because it is blue
That didn't even make that much sense in English.