Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 834 | 748 | 835 | 800 | 825 | 806 |
| Tmin | 651 | 588 | 651 | 630 | 651 | 630 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 192 | 170 | 189 | 181 | 186 | 192 |
| Humidity/Visibility | 179 | 161 | 180 | 171 | 179 | 172 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 832 | 833 | 836 | 852 | 834 | 866 |
| Tmin | 652 | 651 | 630 | 651 | 630 | 651 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 196 | 195 | 212 | 216 | 222 | 236 |
| Humidity/Visibility | 176 | 178 | 202 | 201 | 198 | 205 |
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. |
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