Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 65 | 66 | 67 | 98 | 93 | 97 |
| Tmin | 80 | 77 | 86 | 108 | 107 | 100 |
| Duration of sunshine | 155 | 85 | 62 | 180 | 217 | 240 |
| Precipitation | 109 | 101 | 109 | 131 | 143 | 138 |
| Humidity/Visibility | 57 | 63 | 66 | 84 | 84 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 96 | 99 | 89 | 85 | 75 | 86 |
| Tmin | 108 | 110 | 112 | 104 | 91 | 108 |
| Duration of sunshine | 93 | 248 | 240 | 124 | 60 | 186 |
| Precipitation | 139 | 143 | 129 | 131 | 143 | 139 |
| Humidity/Visibility | 95 | 92 | 90 | 80 | 70 | 86 |
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. |
