Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 414 | 376 | 421 | 416 | 430 | 410 |
| Tmin | 417 | 381 | 423 | 414 | 432 | 412 |
| Duration of sunshine | 23 | 19 | 19 | 14 | 20 | 0 |
| Precipitation | 130 | 119 | 124 | 123 | 127 | 122 |
| Humidity/Visibility | 103 | 100 | 113 | 112 | 118 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 425 | 446 | 428 | 443 | 431 | 397 |
| Tmin | 421 | 438 | 429 | 440 | 439 | 405 |
| Duration of sunshine | 3 | 19 | 16 | 13 | 21 | 0 |
| Precipitation | 128 | 157 | 157 | 152 | 161 | 132 |
| Humidity/Visibility | 117 | 132 | 130 | 132 | 108 | 110 |
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. |
