Number of days available for climatic review
| parametr | sty | lut | mar | kwi | maj | cze |
| Tmax | 816 | 740 | 829 | 804 | 832 | 792 |
| Tmin | 826 | 745 | 828 | 806 | 835 | 801 |
| słońce (godz.) | 132 | 119 | 132 | 122 | 137 | 127 |
| opad | 839 | 756 | 844 | 815 | 837 | 818 |
| wilgotność / widzialność | 143 | 132 | 145 | 137 | 139 | 134 |
| parametr | lip | sie | wrz | paź | lis | gru |
| Tmax | 823 | 846 | 827 | 851 | 816 | 798 |
| Tmin | 824 | 844 | 826 | 850 | 822 | 806 |
| słońce (godz.) | 135 | 153 | 155 | 142 | 86 | 99 |
| opad | 846 | 871 | 846 | 867 | 843 | 844 |
| wilgotność / widzialność | 138 | 150 | 156 | 162 | 141 | 141 |
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. |
