Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 3582 | 3235 | 3583 | 3471 | 3566 | 3469 |
| Tmin | 3591 | 3245 | 3591 | 3469 | 3569 | 3470 |
| Duration of sunshine | 93 | 86 | 62 | 60 | 155 | 180 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 182 | 164 | 178 | 172 | 176 | 172 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 3577 | 3583 | 3500 | 3616 | 3491 | 3598 |
| Tmin | 3587 | 3581 | 3505 | 3616 | 3495 | 3607 |
| Duration of sunshine | 186 | 155 | 150 | 124 | 90 | 93 |
| Precipitation | 188 | 190 | 210 | 215 | 205 | 217 |
| Humidity/Visibility | 173 | 176 | 197 | 204 | 198 | 214 |
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. |
