Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2066 | 1864 | 2062 | 2001 | 2054 | 2000 |
| Tmin | 2070 | 1870 | 2071 | 2000 | 2051 | 1999 |
| Duration of sunshine | 155 | 142 | 155 | 150 | 155 | 180 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 185 | 165 | 184 | 177 | 182 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2061 | 2066 | 2024 | 2094 | 2032 | 2108 |
| Tmin | 2073 | 2069 | 2028 | 2099 | 2037 | 2113 |
| Duration of sunshine | 186 | 186 | 180 | 186 | 120 | 155 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 181 | 183 | 204 | 208 | 200 | 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. |
