Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 74 | 74 | 74 | 76 | 81 | 96 |
| Tmin | 86 | 75 | 86 | 86 | 89 | 100 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 106 | 106 | 100 | 99 | 102 | 111 |
| Humidity/Visibility | 61 | 56 | 61 | 62 | 64 | 71 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 102 | 96 | 106 | 107 | 94 | 103 |
| Tmin | 115 | 113 | 113 | 117 | 104 | 120 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 143 | 130 | 125 | 132 | 143 |
| Humidity/Visibility | 82 | 78 | 81 | 82 | 76 | 78 |
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. |
