Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 307 | 274 | 328 | 323 | 339 | 328 |
| Tmin | 307 | 276 | 327 | 327 | 339 | 329 |
| Duration of sunshine | 248 | 254 | 279 | 270 | 310 | 300 |
| Precipitation | 93 | 84 | 93 | 90 | 93 | 90 |
| Humidity/Visibility | 0 | 0 | 0 | 0 | 0 | 0 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 327 | 324 | 327 | 330 | 325 | 311 |
| Tmin | 332 | 327 | 330 | 333 | 326 | 311 |
| Duration of sunshine | 310 | 279 | 300 | 310 | 210 | 279 |
| Precipitation | 93 | 93 | 90 | 93 | 90 | 93 |
| Humidity/Visibility | 0 | 0 | 0 | 0 | 0 | 0 |
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. |
