Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1099 | 1005 | 1114 | 1104 | 1144 | 1107 |
| Tmin | 1096 | 1006 | 1114 | 1100 | 1142 | 1106 |
| Duration of sunshine | 217 | 226 | 217 | 180 | 155 | 240 |
| Precipitation | 122 | 110 | 124 | 150 | 155 | 150 |
| Humidity/Visibility | 121 | 109 | 122 | 142 | 150 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1145 | 1142 | 1107 | 1137 | 1107 | 1141 |
| Tmin | 1140 | 1141 | 1105 | 1135 | 1105 | 1141 |
| Duration of sunshine | 248 | 248 | 210 | 248 | 240 | 248 |
| Precipitation | 156 | 156 | 151 | 153 | 151 | 155 |
| Humidity/Visibility | 153 | 151 | 147 | 148 | 148 | 152 |
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. |
