Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2096 | 1893 | 2093 | 2032 | 2079 | 2021 |
| Tmin | 2104 | 1904 | 2103 | 2032 | 2085 | 2031 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 187 | 169 | 190 | 181 | 188 | 180 |
| Humidity/Visibility | 179 | 159 | 175 | 168 | 172 | 167 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2088 | 2095 | 2056 | 2122 | 2062 | 2135 |
| Tmin | 2099 | 2097 | 2061 | 2131 | 2067 | 2133 |
| Duration of sunshine | 155 | 124 | 90 | 93 | 60 | 62 |
| Precipitation | 187 | 191 | 212 | 216 | 212 | 218 |
| Humidity/Visibility | 168 | 172 | 189 | 198 | 205 | 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. |
