Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1114 | 1009 | 1116 | 1137 | 1142 | 1104 |
| Tmin | 1117 | 1009 | 1118 | 1138 | 1145 | 1106 |
| Duration of sunshine | 124 | 141 | 155 | 150 | 124 | 60 |
| Precipitation | 93 | 85 | 93 | 121 | 124 | 120 |
| Humidity/Visibility | 90 | 84 | 84 | 110 | 113 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1171 | 1169 | 1131 | 1172 | 1136 | 1173 |
| Tmin | 1173 | 1168 | 1129 | 1174 | 1134 | 1175 |
| Duration of sunshine | 93 | 155 | 180 | 186 | 150 | 124 |
| Precipitation | 125 | 126 | 120 | 122 | 126 | 124 |
| Humidity/Visibility | 114 | 111 | 111 | 109 | 108 | 115 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
