Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2088 | 1896 | 2092 | 2031 | 2085 | 2033 |
| Tmin | 2082 | 1902 | 2104 | 2030 | 2082 | 2032 |
| Duration of sunshine | 93 | 86 | 93 | 90 | 155 | 180 |
| Precipitation | 186 | 170 | 187 | 182 | 186 | 180 |
| Humidity/Visibility | 177 | 160 | 175 | 170 | 174 | 170 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2098 | 2097 | 2057 | 2117 | 2064 | 2125 |
| Tmin | 2103 | 2099 | 2053 | 2120 | 2067 | 2131 |
| Duration of sunshine | 186 | 155 | 150 | 124 | 90 | 93 |
| Precipitation | 188 | 190 | 210 | 206 | 210 | 218 |
| Humidity/Visibility | 171 | 176 | 195 | 192 | 195 | 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. |
