Sveti Ivan Zelina is a town in Zagreb County, Croatia. Since records began in 1981, the highest temperature recorded at the local weather statio…Sveti Ivan Zelina is a town in Zagreb County, Croatia. Since records began in 1981, the highest temperature recorded at the local weather station was 38.2 °C, on 24 August 2012. The coldest temperature was −21.0 °C, on 12 February 1985.