Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 394 | 356 | 390 | 385 | 399 | 401 |
| Tmin | 396 | 358 | 397 | 384 | 398 | 394 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 87 | 99 | 99 | 97 | 103 |
| Humidity/Visibility | 88 | 82 | 88 | 86 | 90 | 99 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 428 | 429 | 418 | 420 | 413 | 425 |
| Tmin | 423 | 424 | 417 | 423 | 413 | 428 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 134 | 131 | 121 | 122 | 121 | 126 |
| Humidity/Visibility | 118 | 117 | 116 | 115 | 115 | 122 |
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. |
