Summery, temperate (5)
I believe the answer is:
balmy
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">summery</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">temperate</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for balmy that I've seen before include "(Of weather) pleasantly warm" , "Of weather, mild and clement" , "Pleasantly mild" , "Warm, summery" , "Mild and pleasant" .)