Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2090 | 1892 | 2094 | 2027 | 2088 | 2024 |
| Tmin | 2104 | 1903 | 2097 | 2024 | 2085 | 2032 |
| Duration of sunshine | 124 | 113 | 124 | 120 | 155 | 180 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 181 | 163 | 179 | 172 | 174 | 170 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2091 | 2094 | 2057 | 2122 | 2059 | 2132 |
| Tmin | 2101 | 2096 | 2065 | 2124 | 2067 | 2133 |
| Duration of sunshine | 155 | 155 | 150 | 155 | 90 | 124 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 172 | 175 | 194 | 202 | 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. |
