summery (adj.)

• aestival
• arctic
• autumnal
• blue-green
• boreal
• brumal
• canicular
• chartreuse
• chlorotic
• equatorial
• equinoctial
• foliaged
• genial
• glaucous
• grassy
• green
• greenish
• greensick
• hibernal
• hiemal
• ivy
• leafy
• leaved
• lukewarm
• mild
• olive
• seasonal
• springlike
• subtropical
• sunny
• temperate
• tepid
• thermal
• thermic
• tropical
• unfrozen
• verdant
• vernal
• vert
• warm
• wintery
• wintry