Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 71 | 68 | 82 | 80 | 85 | 72 |
| Tmin | 78 | 75 | 89 | 77 | 85 | 82 |
| Duration of sunshine | 124 | 141 | 186 | 150 | 155 | 150 |
| Precipitation | 96 | 87 | 92 | 91 | 92 | 90 |
| Humidity/Visibility | 57 | 50 | 59 | 57 | 66 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 83 | 79 | 82 | 92 | 104 | 110 |
| Tmin | 80 | 79 | 85 | 97 | 100 | 112 |
| Duration of sunshine | 155 | 155 | 180 | 155 | 120 | 155 |
| Precipitation | 96 | 95 | 100 | 104 | 122 | 131 |
| Humidity/Visibility | 82 | 79 | 82 | 93 | 96 | 117 |
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. |
