Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1029 | 937 | 1024 | 1036 | 1055 | 1059 |
| Tmin | 1035 | 938 | 1030 | 1031 | 1056 | 1051 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 594 | 542 | 598 | 610 | 635 | 606 |
| Humidity/Visibility | 55 | 48 | 50 | 78 | 78 | 96 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1100 | 1105 | 1055 | 1081 | 1046 | 1087 |
| Tmin | 1103 | 1103 | 1047 | 1079 | 1046 | 1094 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 628 | 623 | 606 | 619 | 612 | 136 |
| Humidity/Visibility | 100 | 105 | 98 | 93 | 90 | 98 |
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. |
