Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 558 | 514 | 580 | 558 | 583 | 554 |
| Tmin | 572 | 532 | 581 | 562 | 583 | 561 |
| Duration of sunshine | 386 | 318 | 380 | 372 | 413 | 402 |
| Precipitation | 161 | 150 | 157 | 151 | 161 | 151 |
| Humidity/Visibility | 148 | 136 | 153 | 147 | 152 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 576 | 605 | 586 | 596 | 583 | 577 |
| Tmin | 573 | 604 | 589 | 600 | 591 | 577 |
| Duration of sunshine | 371 | 336 | 367 | 365 | 340 | 411 |
| Precipitation | 160 | 192 | 185 | 184 | 181 | 162 |
| Humidity/Visibility | 153 | 168 | 172 | 171 | 167 | 149 |
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. |
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