Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 82 | 67 | 72 | 103 | 109 | 108 |
| Tmin | 83 | 73 | 85 | 105 | 117 | 110 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 107 | 97 | 108 | 120 | 129 | 129 |
| Humidity/Visibility | 64 | 55 | 61 | 75 | 85 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 89 | 84 | 109 | 101 | 100 | 97 |
| Tmin | 104 | 99 | 111 | 111 | 103 | 115 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 138 | 130 | 127 | 129 | 132 | 161 |
| Humidity/Visibility | 81 | 78 | 84 | 82 | 76 | 74 |
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. |
