Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 81 | 68 | 68 | 88 | 88 | 102 |
| Tmin | 82 | 76 | 83 | 99 | 109 | 110 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 103 | 95 | 107 | 118 | 144 | 133 |
| Humidity/Visibility | 62 | 55 | 59 | 71 | 78 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 79 | 89 | 102 | 86 | 85 | 98 |
| Tmin | 108 | 98 | 114 | 104 | 99 | 116 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 135 | 134 | 123 | 146 | 139 | 148 |
| Humidity/Visibility | 72 | 72 | 82 | 73 | 71 | 75 |
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. |
