Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 275 | 249 | 276 | 254 | 272 | 265 |
| Tmin | 307 | 275 | 304 | 292 | 299 | 291 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 69 | 60 | 72 | 69 | 67 | 79 |
| Humidity/Visibility | 43 | 40 | 42 | 36 | 42 | 43 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 292 | 300 | 290 | 292 | 274 | 274 |
| Tmin | 305 | 316 | 310 | 324 | 313 | 317 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 108 | 111 | 103 | 96 | 100 | 109 |
| Humidity/Visibility | 56 | 59 | 60 | 58 | 54 | 48 |
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. |
