Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 113 | 86 | 96 | 106 | 118 | 113 |
| Tmin | 110 | 90 | 94 | 105 | 116 | 114 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 125 | 95 | 124 | 141 | 147 | 148 |
| Humidity/Visibility | 106 | 89 | 109 | 119 | 136 | 137 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 119 | 116 | 115 | 101 | 114 | 121 |
| Tmin | 118 | 118 | 114 | 103 | 106 | 117 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 145 | 152 | 148 | 144 | 122 | 130 |
| Humidity/Visibility | 138 | 137 | 137 | 120 | 111 | 120 |
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. |
