## 3 Results
### Comparisons of the Average Monthly SD Differences Recorded by Manual and Automatic Devices  
The percentages of the differences in the different pairs of the manual (CS) and electronic devices (Gl, Pr and CSD3), estimated by Equation (1) on a monthly basis, are shown in Table 3. The average annual sum of sunshine duration for the CS recorder at Larnaca reached a value of 3372.4 h, and this was 6.4 h higher than that measured using the pyranometric method. In the case of Pafos for the same pair of recorders, the annual average sum reached a value of 3415.0 h, which was 175.2 h higher than that measured using the pyranometric method. In the case of the comparisons of the pairs of CS and CSD3, the annual differences for Pentakomo are 112.7 h, while for Menmogia they are \(-111.5\) h. The differences in absolute values are almost the same. In the case of Athalassa, the differences between the pair of CS and Pr are \(-150.7\) h, i.e., the annual sum of CS sunshine recorder is higher than the CHP1 pyrhilometer. Therefore, with the exception of the CSD3 sensor at Pentakomo, in the rest of the cases, the CS recorder measures higher annual values of SD than the automatic sensors. Figure 6: Monthly boxplots of daily differences among the pairs of sunshine duration measurements for the locations and periods shown in the graphs. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c} \hline \hline
**Station** & **Period** & **SD** & **Unit/Mth** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** & **12** & **Annual** \\ \hline Lamaca A/P & 2009-2012 & SD\_CS & h & 170.1 & 184.5 & 247.9 & 289.3 & 343.1 & 372.9 & 388.9 & 368.4 & 307.7 & 267.7 & 238.6 & 193.3 & 3372.4 \\ Lamaca A/P & 2009-2012 & SD\_CI & h & 163.9 & 177 & 247.7 & 284.6 & 340 & 384.3 & 401.7 & 375.8 & 321.6 & 261.9 & 225.7 & 182.5 & 336.6 \\  & R +SD\_CI & h & \(-\)62 & \(-\)7.5 & \(-\)02 & \(-\)4.7 & \(-\)3 & 114.2 & 12.1 & 7.3 & 13.9 & \(-\)59 & \(-\)12.9 & \(-\)10.7 & \(-\)64 \\  & & 4 SD G-CS & h/d & \(-\)02 & \(-\)03 & \(0\) & \(-\)02 & \(-\)01 & 0.4 & 0.4 & 0.2 & 0.5 & \(-\)02.2 & \(-\)04.3 & \(-\)0 \\  & R \(\times\) 100/SD\_CS & \% & \(-\)36 & \(-\)4.1 & \(-\)01 & \(-\)1.6 & \(-\)09 & 3.1 & 3.1 & 2.1 & 4.5 & \(-\)22 & \(-\)54 & \(-\)56 & \(-\)02 \\ \hline Lamaca A/P & 2009-2012 & SD\_CS & h & 170.1 & 184.5 & 247.9 & 289.3 & 343.1 & 372.9 & 388.9 & 368.4 & 307.7 & 267.7 & 238.6 & 193.3 & 3372.4 \\ Pentakomo & 2011-2012 & SD\_CS3D, Pent & h & 177.8 & 212.5 & 285 & 295 & 340.5 & 375.5 & 382.1 & 371.3 & 338.2 & 290.3 & 222.5 & 194.6 & 3485 \\  & R +SD & & & & & & & & & & & & & & & \\  & CSD\_D-P+CS & h & 7.6 & 28 & 37.1 & 5.7 & \(-\)25 & 2.6 & \(-\)68 & 2.9 & 30.5 & 22.6 & \(-\)16.2 & 1.3 & 112.7 \\  & & 4 SD CS3D-P+CS & h/d & 0.2 & 1 & 1.2 & 0.2 & \(-\)01 & 0.1 & \(-\)02 & 0.1 & 1 & 0.7 & \(-\)05 & 0 & 0.3 \\  & R \(\times\) 100/SD\_CS & \% & 4.5 & 15.2 & 15 & 2 & \(-\)07 & 0.7 & \(-\)1.8 & 0.8 & 0.9 & 8.4 & \(-\)68 & 0.7 & 3.3 \\ \hline Lamaca A/P & 2009-2012 & SD\_CS & h & 170.1 & 184.5 & 247.9 & 289.3 & 343.1 & 372.9 & 388.9 & 368.4 & 307.7 & 267.7 & 238.6 & 193.3 & 3372.4 \\ Menopia & 2009-2012 & SD\_CS3D, Menn & h & 154.9 & 172.2 & 238 & 278.3 & 325.3 & 364.3 & 378.9 & 367.7 & 321.1 &Figure 7 shows the percentage difference between automatic devices and CS recorders for each month of the year for the selected study locations. It has to be noted that a positive percentage difference indicates that the automatic sensor measures higher sunshine duration than the CS recorder. Overall, with the exception of the CSD3_Pent and CS pair at Larnaca, the percentage difference is typically negative. The positive difference in the said pair is recorded in the periods from December to April and August to October. The highest positive difference is recorded in February and March reaching the value of approximately 15%. A secondary positive difference is observed in autumn (September to October).