Number of days available for climatic review
| parametr | sty | lut | mar | kwi | maj | cze |
| Tmax | 1643 | 1495 | 1643 | 1590 | 1643 | 1590 |
| Tmin | 1643 | 1495 | 1643 | 1590 | 1643 | 1590 |
| słońce (godz.) | 1302 | 1183 | 1301 | 1258 | 1301 | 1258 |
| opad | 498 | 448 | 496 | 481 | 496 | 480 |
| wilgotność / widzialność | 184 | 167 | 185 | 179 | 185 | 179 |
| parametr | lip | sie | wrz | paź | lis | gru |
| Tmax | 1643 | 1643 | 1590 | 1643 | 1590 | 1643 |
| Tmin | 1643 | 1643 | 1590 | 1643 | 1590 | 1643 |
| słońce (godz.) | 1301 | 1305 | 1289 | 1325 | 1287 | 1332 |
| opad | 498 | 500 | 510 | 525 | 510 | 527 |
| wilgotność / widzialność | 184 | 184 | 207 | 210 | 207 | 215 |
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. |
