Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 89 | 82 | 83 | 86 | 87 | 100 |
| Tmin | 88 | 81 | 91 | 88 | 89 | 98 |
| Duration of sunshine | 186 | 113 | 155 | 120 | 186 | 150 |
| Precipitation | 100 | 92 | 99 | 95 | 99 | 107 |
| Humidity/Visibility | 66 | 61 | 66 | 65 | 66 | 73 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 117 | 120 | 117 | 118 | 118 | 117 |
| Tmin | 119 | 123 | 115 | 118 | 113 | 121 |
| Duration of sunshine | 124 | 155 | 240 | 248 | 210 | 155 |
| Precipitation | 126 | 129 | 122 | 126 | 128 | 130 |
| Humidity/Visibility | 90 | 88 | 84 | 85 | 85 | 90 |
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. |
