Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 941 | 858 | 950 | 924 | 953 | 918 |
| Tmin | 909 | 833 | 926 | 894 | 925 | 892 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 528 | 477 | 528 | 510 | 527 | 510 |
| Humidity/Visibility | 164 | 152 | 162 | 164 | 169 | 163 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 951 | 950 | 948 | 964 | 953 | 953 |
| Tmin | 920 | 922 | 920 | 940 | 923 | 950 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 528 | 528 | 536 | 548 | 540 | 533 |
| Humidity/Visibility | 169 | 171 | 190 | 187 | 190 | 176 |
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. |
