Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1237 | 1123 | 1260 | 1199 | 1257 | 1208 |
| Tmin | 1219 | 1097 | 1235 | 1171 | 1223 | 1184 |
| Duration of sunshine | 359 | 281 | 356 | 324 | 314 | 308 |
| Precipitation | 184 | 160 | 185 | 170 | 178 | 172 |
| Humidity/Visibility | 152 | 129 | 155 | 137 | 146 | 142 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1232 | 1256 | 1230 | 1273 | 1230 | 1240 |
| Tmin | 1222 | 1228 | 1213 | 1242 | 1203 | 1245 |
| Duration of sunshine | 351 | 353 | 394 | 337 | 337 | 404 |
| Precipitation | 178 | 180 | 208 | 201 | 202 | 190 |
| Humidity/Visibility | 147 | 145 | 172 | 161 | 152 | 169 |
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. |
