Está is the conjugation of the verb estar for the third person singular in the simple present tense. Here this tense is being used to describe something that happens now. On the other hand, the verb estar is being used as <em>condition, </em>expressing something that is likely to vary over several days or weeks. Finally:
<em> Este invierno el clima </em><em>está</em><em> muy frío.</em>
