Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 886 | 803 | 886 | 856 | 884 | 855 |
| Tmin | 882 | 808 | 890 | 853 | 885 | 860 |
| Duration of sunshine | 199 | 274 | 261 | 284 | 253 | 242 |
| Precipitation | 439 | 401 | 438 | 430 | 444 | 419 |
| Humidity/Visibility | 147 | 133 | 145 | 144 | 146 | 139 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 878 | 876 | 886 | 917 | 887 | 921 |
| Tmin | 873 | 885 | 888 | 914 | 884 | 924 |
| Duration of sunshine | 283 | 291 | 335 | 311 | 338 | 290 |
| Precipitation | 435 | 448 | 452 | 462 | 456 | 474 |
| Humidity/Visibility | 147 | 148 | 170 | 168 | 164 | 174 |
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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