Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2094 | 1885 | 2095 | 2029 | 2085 | 2021 |
| Tmin | 2102 | 1899 | 2101 | 2030 | 2093 | 2034 |
| Duration of sunshine | 31 | 28 | 31 | 30 | 62 | 90 |
| Precipitation | 187 | 173 | 187 | 182 | 186 | 181 |
| Humidity/Visibility | 182 | 161 | 183 | 175 | 177 | 172 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2092 | 2096 | 2050 | 2118 | 2059 | 2129 |
| Tmin | 2102 | 2106 | 2061 | 2128 | 2066 | 2135 |
| Duration of sunshine | 93 | 62 | 60 | 62 | 30 | 31 |
| Precipitation | 187 | 190 | 208 | 217 | 211 | 217 |
| Humidity/Visibility | 178 | 181 | 197 | 204 | 203 | 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. |
