Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 85 | 55 | 77 | 88 | 77 | 98 |
| Tmin | 88 | 55 | 85 | 83 | 80 | 102 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 125 | 87 | 113 | 124 | 135 | 133 |
| Humidity/Visibility | 58 | 41 | 55 | 57 | 47 | 62 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 109 | 119 | 113 | 115 | 106 | 115 |
| Tmin | 116 | 121 | 119 | 120 | 106 | 121 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 152 | 157 | 149 | 151 | 161 | 177 |
| Humidity/Visibility | 71 | 73 | 71 | 69 | 65 | 73 |
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. |
