Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 88 | 79 | 88 | 93 | 117 | 112 |
| Tmin | 83 | 77 | 85 | 96 | 117 | 107 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 96 | 99 | 120 | 132 | 128 |
| Humidity/Visibility | 87 | 79 | 90 | 97 | 115 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 111 | 119 | 112 | 106 | 104 | 116 |
| Tmin | 106 | 114 | 109 | 104 | 105 | 119 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 130 | 123 | 123 | 124 | 130 |
| Humidity/Visibility | 113 | 116 | 114 | 109 | 107 | 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. |
