Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 318 | 287 | 319 | 322 | 346 | 345 |
| Tmin | 327 | 286 | 323 | 328 | 349 | 340 |
| Duration of sunshine | 248 | 197 | 248 | 270 | 310 | 300 |
| Precipitation | 93 | 87 | 95 | 109 | 124 | 124 |
| Humidity/Visibility | 92 | 84 | 91 | 104 | 123 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 353 | 353 | 340 | 365 | 357 | 355 |
| Tmin | 359 | 355 | 335 | 365 | 359 | 361 |
| Duration of sunshine | 248 | 279 | 300 | 279 | 240 | 217 |
| Precipitation | 127 | 127 | 120 | 122 | 120 | 124 |
| Humidity/Visibility | 122 | 121 | 118 | 117 | 117 | 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. |
