Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 181 | 162 | 175 | 172 | 177 | 169 |
| Tmin | 64 | 57 | 63 | 60 | 62 | 63 |
| Duration of sunshine | 186 | 197 | 186 | 180 | 248 | 240 |
| Precipitation | 125 | 115 | 124 | 121 | 126 | 119 |
| Humidity/Visibility | 119 | 108 | 117 | 114 | 117 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 175 | 178 | 172 | 175 | 169 | 181 |
| Tmin | 64 | 62 | 62 | 62 | 60 | 63 |
| Duration of sunshine | 186 | 217 | 210 | 217 | 240 | 310 |
| Precipitation | 136 | 131 | 120 | 124 | 120 | 134 |
| Humidity/Visibility | 114 | 118 | 112 | 109 | 108 | 116 |
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. |
