Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 113 | 103 | 118 | 138 | 145 | 138 |
| Tmin | 112 | 101 | 119 | 132 | 145 | 140 |
| Duration of sunshine | 186 | 225 | 248 | 240 | 310 | 270 |
| Precipitation | 128 | 118 | 134 | 160 | 161 | 154 |
| Humidity/Visibility | 115 | 102 | 117 | 135 | 146 | 142 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 139 | 139 | 136 | 136 | 113 | 121 |
| Tmin | 142 | 133 | 134 | 133 | 109 | 122 |
| Duration of sunshine | 217 | 279 | 240 | 248 | 240 | 248 |
| Precipitation | 159 | 157 | 153 | 148 | 124 | 128 |
| Humidity/Visibility | 144 | 135 | 135 | 137 | 109 | 119 |
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. |
