Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 140 | 116 | 133 | 169 | 176 | 165 |
| Tmin | 142 | 138 | 146 | 175 | 181 | 166 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 104 | 97 | 103 | 131 | 129 | 131 |
| Humidity/Visibility | 62 | 55 | 60 | 83 | 88 | 81 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 157 | 172 | 162 | 169 | 162 | 166 |
| Tmin | 169 | 183 | 178 | 171 | 167 | 180 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 133 | 132 | 123 | 126 | 131 | 135 |
| Humidity/Visibility | 79 | 87 | 82 | 81 | 78 | 83 |
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. |
