Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1171 | 1064 | 1175 | 1170 | 1205 | 1168 |
| Tmin | 1169 | 1066 | 1176 | 1168 | 1208 | 1164 |
| Duration of sunshine | 248 | 225 | 217 | 240 | 279 | 240 |
| Precipitation | 98 | 88 | 96 | 125 | 124 | 120 |
| Humidity/Visibility | 90 | 83 | 90 | 116 | 122 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1201 | 1201 | 1164 | 1201 | 1168 | 1205 |
| Tmin | 1204 | 1205 | 1161 | 1201 | 1161 | 1200 |
| Duration of sunshine | 217 | 279 | 300 | 248 | 240 | 248 |
| Precipitation | 128 | 126 | 120 | 124 | 122 | 132 |
| Humidity/Visibility | 122 | 120 | 118 | 116 | 116 | 122 |
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. |
