Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 117 | 102 | 120 | 138 | 149 | 142 |
| Tmin | 120 | 104 | 116 | 132 | 147 | 142 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 117 | 123 | 152 | 157 | 151 |
| Humidity/Visibility | 121 | 105 | 119 | 136 | 148 | 144 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 148 | 151 | 143 | 144 | 142 | 145 |
| Tmin | 143 | 146 | 143 | 141 | 142 | 146 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 163 | 161 | 149 | 155 | 156 | 161 |
| Humidity/Visibility | 146 | 149 | 142 | 147 | 142 | 147 |
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. |
