Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2081 | 1891 | 2093 | 2026 | 2066 | 2019 |
| Tmin | 2089 | 1894 | 2103 | 2029 | 2073 | 2023 |
| Duration of sunshine | 62 | 28 | 31 | 60 | 62 | 120 |
| Precipitation | 187 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 176 | 165 | 181 | 176 | 175 | 171 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2084 | 2091 | 2047 | 2125 | 2053 | 2118 |
| Tmin | 2099 | 2092 | 2056 | 2132 | 2063 | 2127 |
| Duration of sunshine | 124 | 93 | 120 | 93 | 60 | 62 |
| Precipitation | 188 | 190 | 211 | 215 | 210 | 217 |
| Humidity/Visibility | 175 | 178 | 196 | 205 | 205 | 209 |
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. |
