How to use “fa”
From my knowledge, “fa” is an abbreviated term for fare, which means “to do” or “to make”, and even “ago” in it’s own right. But as I’ve continued the Italian course I’ve seen “fa” used in sentences such as “Mio zio fa il conduttore” or “Fa sempre freddo” to mean is or it where “È” would work fine. So my question is, how do you know when to use fa like this?
Fa is third person singular present tense for fare (not abbreviated) and is required in the expressions you note above (you cannot substitute essere or è).
Fare is used with both weather conditions and professions.