Number of days available for climatic review
| parametr | sty | lut | mar | kwi | maj | cze |
| Tmax | 754 | 701 | 775 | 764 | 793 | 780 |
| Tmin | 755 | 702 | 774 | 766 | 793 | 778 |
| słońce (godz.) | 0 | 0 | 0 | 0 | 0 | 0 |
| opad | 93 | 85 | 95 | 109 | 124 | 120 |
| wilgotność / widzialność | 92 | 84 | 91 | 104 | 123 | 118 |
| parametr | lip | sie | wrz | paź | lis | gru |
| Tmax | 804 | 802 | 767 | 799 | 777 | 802 |
| Tmin | 806 | 806 | 769 | 799 | 779 | 806 |
| słońce (godz.) | 0 | 0 | 0 | 0 | 0 | 0 |
| opad | 127 | 127 | 120 | 124 | 120 | 124 |
| wilgotność / widzialność | 122 | 122 | 118 | 117 | 118 | 124 |
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. |
