Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 93 | 82 | 89 | 113 | 123 | 119 |
| Tmin | 92 | 84 | 86 | 112 | 120 | 115 |
| Duration of sunshine | 217 | 169 | 279 | 210 | 217 | 240 |
| Precipitation | 124 | 112 | 128 | 146 | 155 | 150 |
| Humidity/Visibility | 92 | 83 | 88 | 112 | 123 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 119 | 121 | 110 | 84 | 88 | 92 |
| Tmin | 117 | 119 | 109 | 81 | 88 | 90 |
| Duration of sunshine | 279 | 279 | 240 | 310 | 210 | 217 |
| Precipitation | 158 | 156 | 152 | 151 | 145 | 124 |
| Humidity/Visibility | 120 | 121 | 112 | 86 | 88 | 91 |
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. |
