Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 80 | 74 | 80 | 84 | 84 | 89 |
| Tmin | 91 | 80 | 88 | 87 | 92 | 100 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 99 | 95 | 99 | 97 | 95 | 108 |
| Humidity/Visibility | 65 | 57 | 63 | 65 | 65 | 70 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 97 | 111 | 99 | 100 | 98 | 103 |
| Tmin | 115 | 124 | 115 | 116 | 108 | 121 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 128 | 121 | 122 | 130 | 130 |
| Humidity/Visibility | 79 | 84 | 78 | 80 | 78 | 84 |
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. |
