Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 277 | 250 | 278 | 282 | 308 | 297 |
| Tmin | 278 | 251 | 278 | 286 | 310 | 298 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 93 | 86 | 96 | 111 | 124 | 122 |
| Humidity/Visibility | 92 | 84 | 91 | 104 | 122 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 302 | 307 | 297 | 301 | 297 | 305 |
| Tmin | 305 | 308 | 300 | 302 | 296 | 310 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 129 | 120 | 124 | 122 | 125 |
| Humidity/Visibility | 121 | 121 | 118 | 117 | 117 | 123 |
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. |
