Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2093 | 1896 | 2098 | 2033 | 2083 | 2030 |
| Tmin | 2100 | 1894 | 2102 | 2033 | 2087 | 2034 |
| Duration of sunshine | 93 | 86 | 93 | 90 | 155 | 180 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 183 | 165 | 184 | 177 | 182 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2097 | 2094 | 2053 | 2124 | 2063 | 2126 |
| Tmin | 2105 | 2100 | 2058 | 2128 | 2068 | 2133 |
| Duration of sunshine | 186 | 155 | 120 | 124 | 90 | 93 |
| Precipitation | 187 | 190 | 206 | 215 | 210 | 218 |
| Humidity/Visibility | 181 | 182 | 197 | 207 | 201 | 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. |
