Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 398 | 359 | 400 | 389 | 400 | 389 |
| Tmin | 402 | 363 | 402 | 388 | 403 | 388 |
| Duration of sunshine | 248 | 254 | 279 | 270 | 310 | 300 |
| Precipitation | 124 | 112 | 124 | 121 | 124 | 120 |
| Humidity/Visibility | 147 | 0 | 560956424 | 8 | 560957448 | 8 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 400 | 373 | 388 | 401 | 387 | 401 |
| Tmin | 401 | 375 | 389 | 401 | 389 | 401 |
| Duration of sunshine | 310 | 310 | 300 | 310 | 240 | 279 |
| Precipitation | 125 | 99 | 120 | 124 | 120 | 124 |
| Humidity/Visibility | 560958472 | 8 | 560971784 | 8 | 560972808 | 8 |
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. |
