Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2096 | 1897 | 2095 | 2025 | 2081 | 2032 |
| Tmin | 2095 | 1900 | 2104 | 2031 | 2080 | 2033 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 182 | 165 | 183 | 177 | 182 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2089 | 2092 | 2055 | 2123 | 2063 | 2138 |
| Tmin | 2102 | 2090 | 2064 | 2124 | 2066 | 2140 |
| Duration of sunshine | 155 | 124 | 90 | 93 | 60 | 62 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 181 | 182 | 204 | 204 | 203 | 214 |
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. |
