highly significantP < 0.001
A highly significant model ( R 2 = 63.2%, P < 0.001) was obtained with three variables: year ( b = 0.61 ± 0.12, P < 0.001), June mean temperature ( b = 3.71 ± 1.13 P = 0.002), and first inspection of hives ( b = −0.21 ± 0.09, P = 0.028).