Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1082 | 980 | 1128 | 1073 | 1112 | 1067 |
| Tmin | 1065 | 958 | 1100 | 1043 | 1085 | 1042 |
| Duration of sunshine | 349 | 251 | 356 | 354 | 281 | 293 |
| Precipitation | 196 | 179 | 204 | 179 | 191 | 190 |
| Humidity/Visibility | 144 | 119 | 142 | 127 | 132 | 128 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1079 | 1107 | 1096 | 1110 | 1073 | 1087 |
| Tmin | 1063 | 1089 | 1080 | 1100 | 1037 | 1096 |
| Duration of sunshine | 369 | 340 | 420 | 335 | 326 | 395 |
| Precipitation | 189 | 185 | 220 | 217 | 226 | 216 |
| Humidity/Visibility | 142 | 134 | 157 | 142 | 133 | 153 |
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. |
