Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 316 | 280 | 321 | 309 | 318 | 307 |
| Tmin | 317 | 283 | 322 | 309 | 321 | 313 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 87 | 95 | 111 | 124 | 124 |
| Humidity/Visibility | 92 | 84 | 91 | 103 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 317 | 319 | 309 | 337 | 334 | 342 |
| Tmin | 320 | 320 | 309 | 339 | 336 | 346 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 127 | 127 | 122 | 124 | 120 | 124 |
| Humidity/Visibility | 122 | 121 | 117 | 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. |
