Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1111 | 1002 | 1115 | 1077 | 1114 | 1079 |
| Tmin | 1108 | 1002 | 1113 | 1072 | 1113 | 1076 |
| Duration of sunshine | 261 | 235 | 293 | 290 | 298 | 283 |
| Precipitation | 188 | 172 | 190 | 185 | 186 | 180 |
| Humidity/Visibility | 135 | 122 | 137 | 132 | 138 | 133 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1112 | 1114 | 1104 | 1139 | 1100 | 1138 |
| Tmin | 1114 | 1115 | 1105 | 1138 | 1104 | 1140 |
| Duration of sunshine | 290 | 291 | 315 | 319 | 318 | 325 |
| Precipitation | 186 | 190 | 212 | 215 | 211 | 221 |
| Humidity/Visibility | 136 | 137 | 154 | 156 | 153 | 157 |
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. |
