Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 85 | 76 | 88 | 86 | 81 | 58 |
| Tmin | 138 | 122 | 116 | 108 | 105 | 83 |
| Duration of sunshine | 195 | 182 | 103 | 187 | 127 | 111 |
| Precipitation | 175 | 161 | 158 | 166 | 140 | 108 |
| Humidity/Visibility | 1 | 0 | 33206 | 1000 | 2 | 0 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 50 | 56 | 57 | 55 | 29 | 50 |
| Tmin | 84 | 91 | 87 | 84 | 47 | 78 |
| Duration of sunshine | 201 | 148 | 168 | 264 | 52 | 168 |
| Precipitation | 119 | 124 | 119 | 121 | 121 | 116 |
| Humidity/Visibility | 14 | -2147483648 | 0 | 0 | 0 | 0 |
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. |
