Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 801 | 719 | 800 | 775 | 799 | 777 |
| Tmin | 803 | 721 | 795 | 777 | 803 | 774 |
| Duration of sunshine | 336 | 381 | 356 | 354 | 395 | 381 |
| Precipitation | 155 | 143 | 157 | 151 | 155 | 150 |
| Humidity/Visibility | 150 | 133 | 150 | 145 | 149 | 146 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 797 | 798 | 775 | 798 | 773 | 802 |
| Tmin | 804 | 799 | 769 | 797 | 774 | 797 |
| Duration of sunshine | 336 | 330 | 373 | 356 | 295 | 361 |
| Precipitation | 155 | 157 | 153 | 153 | 154 | 157 |
| Humidity/Visibility | 149 | 145 | 141 | 143 | 142 | 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. |
