(adj.) Describing weather or a day characterised by warmth in direct sunlight but noticeable cold in the shade; that particular in-between quality of a bright spring or autumn day.
"She showed up to the picnic in a sundress, didn't account for the esoquious weather, and spent the whole afternoon doing that thing where you take your jacket off, feel amazing for 30 seconds, move into the shade, and immediately put it back on."
"Thought I was finally done with my coat but it's fully esoquious out there — nearly got sunburnt on my lunch break then almost died walking back through the alley."