Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 651 | 588 | 651 | 645 | 682 | 660 |
| Tmin | 650 | 588 | 649 | 645 | 681 | 660 |
| Duration of sunshine | 155 | 141 | 186 | 150 | 217 | 210 |
| Precipitation | 93 | 85 | 95 | 107 | 124 | 120 |
| Humidity/Visibility | 92 | 84 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 682 | 681 | 660 | 678 | 658 | 682 |
| Tmin | 678 | 680 | 659 | 676 | 659 | 681 |
| Duration of sunshine | 217 | 155 | 150 | 186 | 150 | 186 |
| Precipitation | 126 | 126 | 122 | 121 | 120 | 124 |
| Humidity/Visibility | 122 | 122 | 118 | 118 | 118 | 124 |
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. |
