Number of days available for climatic review
| parametr | sty | lut | mar | kwi | maj | cze |
| Tmax | 306 | 279 | 306 | 323 | 336 | 325 |
| Tmin | 304 | 278 | 309 | 325 | 337 | 325 |
| słońce (godz.) | 217 | 225 | 217 | 240 | 310 | 270 |
| opad | 95 | 92 | 96 | 128 | 128 | 121 |
| wilgotność / widzialność | 88 | 83 | 91 | 116 | 119 | 117 |
| parametr | lip | sie | wrz | paź | lis | gru |
| Tmax | 333 | 308 | 292 | 304 | 298 | 304 |
| Tmin | 338 | 312 | 299 | 308 | 297 | 306 |
| słońce (godz.) | 217 | 248 | 210 | 279 | 210 | 279 |
| opad | 127 | 126 | 121 | 126 | 130 | 136 |
| wilgotność / widzialność | 121 | 120 | 117 | 113 | 115 | 118 |
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. |
