Kostajnica, in Srpska, Bosnia and Herzegovina, is home to roughly 4,700 people in the Europe/Sarajevo time zone at 45.2°N latitude.
In 2025, Kostajnica recorded an average annual temperature of 54°F. The hottest temperatures reached 96°F in June; the coolest were 18°F in January. Total precipitation for the year was 33 inches, with the wettest month being March. Snowfall for the year totaled approximately 5 inches.
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