Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1226 | 1107 | 1249 | 1200 | 1241 | 1187 |
| Tmin | 1205 | 1079 | 1223 | 1165 | 1216 | 1168 |
| Duration of sunshine | 340 | 259 | 330 | 347 | 288 | 312 |
| Precipitation | 188 | 160 | 186 | 173 | 181 | 172 |
| Humidity/Visibility | 146 | 124 | 148 | 132 | 137 | 136 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1213 | 1243 | 1231 | 1254 | 1213 | 1230 |
| Tmin | 1200 | 1209 | 1196 | 1234 | 1190 | 1234 |
| Duration of sunshine | 380 | 322 | 410 | 283 | 311 | 394 |
| Precipitation | 176 | 181 | 208 | 204 | 204 | 189 |
| Humidity/Visibility | 140 | 143 | 167 | 154 | 144 | 160 |
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. |
