summerly

From Middle English sumerlich, sumerlic, from Old English sumorlīc, sumerlīċ (“summerly”), equivalent to summer +‎ -ly. Cognate with Dutch zomerlijk (“summerly”), German sommerlich (“summerly”), Danish sommerlig (“summerly”), Swedish sommarlik (“summerly”).

summerly (comparative more summerly, superlative most summerly)

1. Characteristic of summer; summer-like; warm and sunny.
   • 1867, Frederick Metcalfe, The Oxonian in Iceland (page 202)

     "A summerly day for you," said my host; "You ought to be here in winter. It is impossible then to get out of the doors for the snow and wind. Ugh! dreadful weather!"

• summerish
• summerlike
• summery

• summerliness