Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2029 | 1834 | 2029 | 1969 | 2025 | 1958 |
| Tmin | 2034 | 1840 | 2036 | 1967 | 2024 | 1965 |
| Duration of sunshine | 93 | 86 | 93 | 60 | 124 | 150 |
| Precipitation | 187 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 182 | 163 | 183 | 176 | 180 | 175 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2032 | 2030 | 1993 | 2059 | 2000 | 2077 |
| Tmin | 2033 | 2029 | 1999 | 2067 | 2005 | 2075 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 187 | 190 | 210 | 215 | 209 | 217 |
| Humidity/Visibility | 180 | 182 | 203 | 208 | 197 | 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. |
