How does the climate of Bosnia differ from the climate of Herzegovina?

The climate of Bosnia and Herzegovina is significantly influenced by the Dinaric Alps, which largely block Mediterranean Sea weather patterns from reaching the interior.1

Regional Climatic Differences

• Bosnia: The climate in the Bosnia region is comparable to the southern Austrian highlands. It is generally mild but can become bitterly cold during the winter months. For example, in Banja Luka, average temperatures range from 32 °F (0 °C) in January to 72 °F (22 °C) in July. Rainfall is heaviest during May and June.1
• Herzegovina: This region shares more characteristics with the Dalmatia region of Croatia, featuring summers that can be oppressively hot. In Mostar, located along the Neretva River, January temperatures are milder, averaging about 42 °F (6 °C), while July averages reach 78 °F (26 °C). Unlike Bosnia, Herzegovina experiences a relatively dry season from June through September, with the wettest period occurring between October and January.1