Temperature Humidity Wind speed Insolation ET0   Monthly averages data Temperature 1.00               Humidity -0.82  1.00       Wind speed 0.20 -0.06 1.00     Insolation 0.36 -0.50 0.24 1.00   ET0 0.93 -0.86 0.37 0.57 1.00 decade averages data Temperature 100             Humidity -0.79 1.0 0       Wind speed 0.10 0.03 1.00     Insolation 0.24 -0.41 0.21 1.00   ET0 0.91 -0.82 0.32 0.49 1.00   Daily data Temperature 1.00             Humidity -0.78 1.00       Wind speed 0.01 0.07 1.00     Insolation 0.16 -0.27 0.02 1.00     ET0 0.86 -0.79 0.31 0.42 1.00

Table 2: Correlation matrix between input 3 and output variables.