Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 279 | 250 | 279 | 285 | 309 | 299 |
| Tmin | 279 | 253 | 279 | 286 | 310 | 299 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 93 | 85 | 95 | 107 | 124 | 120 |
| Humidity/Visibility | 30 | 28 | 31 | 45 | 61 | 59 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 308 | 309 | 299 | 303 | 299 | 308 |
| Tmin | 310 | 311 | 300 | 304 | 299 | 310 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 128 | 120 | 120 | 120 | 124 |
| Humidity/Visibility | 61 | 61 | 58 | 55 | 58 | 61 |
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. |
