aurinkoisina

Aurinkoisina is a Finnish inflected form of the adjective aurinkoinen, meaning "sunny." It appears when the adjective agrees with a plural noun in the essive case (expressing a temporary state or time), often used in time expressions such as aurinkoisina päivinä ("on sunny days"). Morphologically, aurinkoinen derives from aurinko ("sun") plus the adjectival suffix -inen; the essive plural ending -ina yields aurinkoisina.

Usage is common in everyday speech, weather descriptions, and written texts to describe recurring or temporary sunny conditions. Typical contexts include phrases about leisure and travel (e.g., aurinkoisina viikonloppuina ihmiset viettävät aikaa ulkona — on sunny weekends people spend time outdoors) and observational statements about climate patterns.

Pronunciation guidance: stress falls on the first syllable (approximately "AU-rink-ois-ina"). Related forms include aurinkoinen (basic adjective), aurinkoiset (nominative plural), aurinkoisena (essive singular), and aurinkoisempi (comparative).

As a grammatical form rather than a standalone lexical item, aurinkoisina functions to situate actions or states in time or to characterize plural subjects in a temporary sunny condition. It exemplifies how Finnish uses case endings on adjectives to convey temporal and aspectual nuances without additional words.