Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 176 | 160 | 179 | 171 | 175 | 166 |
| Tmin | 180 | 162 | 180 | 170 | 183 | 173 |
| Duration of sunshine | 274 | 245 | 269 | 289 | 307 | 292 |
| Precipitation | 190 | 173 | 190 | 193 | 190 | 184 |
| Humidity/Visibility | 151 | 137 | 156 | 144 | 153 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 174 | 171 | 198 | 202 | 199 | 209 |
| Tmin | 173 | 172 | 206 | 208 | 203 | 210 |
| Duration of sunshine | 297 | 264 | 293 | 294 | 318 | 332 |
| Precipitation | 193 | 196 | 226 | 216 | 211 | 223 |
| Humidity/Visibility | 141 | 134 | 158 | 164 | 167 | 170 |
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. |
