Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 417 | 376 | 433 | 381 | 435 | 386 |
| Tmin | 459 | 411 | 458 | 439 | 455 | 413 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 409 | 365 | 403 | 413 | 450 | 420 |
| Humidity/Visibility | 60 | 57 | 67 | 68 | 87 | 77 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 401 | 399 | 366 | 428 | 415 | 389 |
| Tmin | 431 | 430 | 418 | 431 | 419 | 423 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 438 | 442 | 422 | 438 | 426 | 144 |
| Humidity/Visibility | 95 | 79 | 77 | 88 | 84 | 80 |
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. |
Adam