Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 367 | 320 | 341 | 330 | 341 | 331 |
| Tmin | 326 | 287 | 311 | 300 | 310 | 300 |
| Duration of sunshine | 170 | 119 | 125 | 120 | 155 | 120 |
| Precipitation | 391 | 375 | 417 | 384 | 387 | 371 |
| Humidity/Visibility | 34 | 25 | 26 | 11 | 10 | 12 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 344 | 342 | 338 | 343 | 348 | 358 |
| Tmin | 310 | 316 | 326 | 328 | 313 | 330 |
| Duration of sunshine | 124 | 193 | 176 | 141 | 222 | 237 |
| Precipitation | 415 | 411 | 387 | 395 | 384 | 180 |
| Humidity/Visibility | 22 | 23 | 31 | 25 | 20 | 34 |
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. |
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