Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 496 | 473 | 559 | 522 | 515 | 540 |
| Tmin | 503 | 478 | 565 | 525 | 523 | 546 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 155 | 141 | 160 | 154 | 161 | 152 |
| Humidity/Visibility | 151 | 118 | 150 | 143 | 134 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 565 | 551 | 532 | 557 | 532 | 567 |
| Tmin | 581 | 557 | 534 | 566 | 541 | 567 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 156 | 159 | 158 | 186 | 185 | 189 |
| Humidity/Visibility | 147 | 143 | 144 | 175 | 170 | 182 |
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. |
