Abstract
The effect of major weather factors on the quality of hops in Slovenia from 1994 to 2009 is analyzed and discussed. For this purpose, the three main varieties, namely Savinjski golding, Aurora and Bobek were merged into a model variety which we called Virtual. Through assessment of correlation coefficients, we tried to find specific times of the year when the weather conditions affect the alpha-acid content with a view toward prediction. The most significant time periods of weather that influenced the alpha-acid contents of hops during the growing season are identified as attributes of air temperatures calculated during the interval from the 24<sup>th</sup> to the 31<sup>st</sup> week (T<sub>2431</sub>; r = &ndash;0.92;P &lt; 0.01), as attributes of rainfall and sunshine duration calculated during the interval from the 25<sup>th</sup> to the 29<sup>th</sup> week (R<sub>2529</sub>; r = 0.83; P &lt; 0.01 and S<sub>2529</sub>, r = &ndash;0.76; P &lt; 0.01), and as attributes of air humidity calculated during the interval from the 28<sup>th</sup> to the 33<sup>rd</sup> week (RH<sub>2833</sub>; r = 0.77; P &lt; 0.01).
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