Tick-borne encephalitis (TBE) is the most significant arboviral infection in Croatia. The aim of the study was to analyse and correlate 17-year TBE seroprevalence data with winter tem-perature, precipitation and wildlife abundance to identify possible patterns that can be predic-tive of TBE incidence. TBE diagnosis was based on IgM/IgG anti-TBE antibodies and individual clinical interpretation of the results. Of the 19,094 analysed patients, 4.2% had acute TBE, signifi-cantly more often in older age (p