Hi Mags - in many weather expression you can use both hay and hace. Note hay comes from haber (to have) and hace comes from hacer (to make/do), so there's a nuance a little like the different between being and doing here. We'll create more lessons to make this clearer so you can see how they all work, along with estar, since that's also a possibility!

¡De nada! There is a link in that lesson that takes you to "Expressions about the weather" where you can see the different possibilities, as Gruff mentioned before. Here it is
https://spanish.kwiziq.com/revision/glossary/transference-problems/expresiones-para-hablar-del-clima">https://spanish.kwiziq.com/revision/glossary/transference-problems/expresiones-para-hablar-del-clima">https://spanish.kwiziq.com/revision/glossary/transference-problems/expresiones-para-hablar-del-clima">https://spanish.kwiziq.com/revision/glossary/transference-problems/expresiones-para-hablar-del-clima
I hope it helps.