Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2159 | 1952 | 2156 | 2093 | 2154 | 2096 |
| Tmin | 2166 | 1954 | 2165 | 2095 | 2158 | 2097 |
| Duration of sunshine | 31 | 57 | 31 | 60 | 62 | 120 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 179 |
| Humidity/Visibility | 183 | 166 | 183 | 177 | 179 | 175 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2157 | 2156 | 2122 | 2187 | 2126 | 2190 |
| Tmin | 2164 | 2164 | 2125 | 2191 | 2129 | 2196 |
| Duration of sunshine | 124 | 124 | 90 | 62 | 60 | 62 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 179 | 180 | 200 | 206 | 206 | 213 |
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. |
