<h2>Right answer: hace</h2>
In this case, the Spanish verb hacer refers to <u>weather conditions </u>or <u>atmospheric temperature</u>.
In this way the verb hacer <u>in its many conjugations</u> works as an impersonal verb, that is, <u>it is conjugated in the third person in singular, without any reference to the subject.
</u>
This means it is not necesary the subject in a sentence with these conditions.
According to this rule, the correct option is hace frío.
Therefore the complete sentence is:
<h2>En mi ciudad durante el otoño <u>hace</u> frío</h2>
In my city during the autumn it is cold
