Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 317 | 280 | 320 | 306 | 318 | 311 |
| Tmin | 317 | 284 | 321 | 313 | 324 | 314 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 87 | 95 | 109 | 124 | 120 |
| Humidity/Visibility | 92 | 83 | 91 | 101 | 118 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 323 | 325 | 310 | 338 | 331 | 345 |
| Tmin | 331 | 320 | 309 | 343 | 334 | 349 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 127 | 127 | 120 | 124 | 120 | 124 |
| Humidity/Visibility | 122 | 122 | 118 | 117 | 118 | 124 |
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. |
