Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 76 | 69 | 82 | 107 | 107 | 101 |
| Tmin | 82 | 76 | 88 | 103 | 107 | 108 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 101 | 98 | 129 | 125 | 122 |
| Humidity/Visibility | 59 | 53 | 63 | 77 | 80 | 75 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 102 | 100 | 95 | 96 | 92 | 105 |
| Tmin | 106 | 105 | 110 | 109 | 96 | 116 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 119 | 118 | 120 | 126 | 137 |
| Humidity/Visibility | 76 | 75 | 76 | 74 | 71 | 80 |
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. |
