Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 323 | 294 | 330 | 339 | 372 | 357 |
| Tmin | 328 | 296 | 329 | 342 | 370 | 355 |
| Duration of sunshine | 186 | 226 | 124 | 240 | 186 | 240 |
| Precipitation | 93 | 85 | 95 | 111 | 124 | 122 |
| Humidity/Visibility | 91 | 84 | 91 | 103 | 122 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 342 | 339 | 331 | 364 | 349 | 354 |
| Tmin | 350 | 341 | 333 | 365 | 347 | 361 |
| Duration of sunshine | 217 | 248 | 270 | 186 | 210 | 217 |
| Precipitation | 126 | 127 | 120 | 124 | 120 | 124 |
| Humidity/Visibility | 122 | 120 | 117 | 116 | 118 | 124 |
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. |
