Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2085 | 1895 | 2096 | 2029 | 2082 | 2026 |
| Tmin | 2090 | 1899 | 2106 | 2035 | 2085 | 2032 |
| Duration of sunshine | 93 | 86 | 93 | 90 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 183 | 166 | 183 | 176 | 179 | 174 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2095 | 2093 | 2056 | 2127 | 2063 | 2128 |
| Tmin | 2102 | 2102 | 2059 | 2132 | 2068 | 2130 |
| Duration of sunshine | 186 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 175 | 179 | 199 | 206 | 206 | 215 |
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. |
