Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 362 | 326 | 342 | 340 | 330 | 312 |
| Tmin | 255 | 236 | 252 | 245 | 254 | 246 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 125 | 114 | 125 | 108 | 101 | 100 |
| Humidity/Visibility | 106 | 85 | 93 | 84 | 73 | 75 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 350 | 339 | 351 | 368 | 356 | 384 |
| Tmin | 257 | 256 | 242 | 253 | 248 | 267 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 130 | 150 | 149 | 156 | 194 |
| Humidity/Visibility | 100 | 107 | 132 | 123 | 115 | 125 |
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. |
