Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 82 | 75 | 78 | 104 | 116 | 108 |
| Tmin | 86 | 77 | 87 | 102 | 118 | 106 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 101 | 93 | 99 | 116 | 129 | 123 |
| Humidity/Visibility | 65 | 59 | 64 | 77 | 86 | 79 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 110 | 109 | 113 | 112 | 100 | 112 |
| Tmin | 114 | 105 | 116 | 113 | 105 | 118 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 134 | 132 | 124 | 129 | 132 | 153 |
| Humidity/Visibility | 84 | 80 | 86 | 84 | 78 | 81 |
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. |
