Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1044 | 944 | 1046 | 1010 | 1046 | 1016 |
| Tmin | 1048 | 949 | 1049 | 1011 | 1049 | 1016 |
| Duration of sunshine | 119 | 137 | 150 | 145 | 148 | 148 |
| Precipitation | 192 | 172 | 204 | 191 | 186 | 180 |
| Humidity/Visibility | 178 | 164 | 173 | 166 | 180 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1051 | 1037 | 1024 | 1067 | 1037 | 1076 |
| Tmin | 1049 | 1044 | 1027 | 1071 | 1043 | 1074 |
| Duration of sunshine | 149 | 140 | 129 | 148 | 147 | 146 |
| Precipitation | 199 | 198 | 216 | 223 | 218 | 231 |
| Humidity/Visibility | 182 | 171 | 186 | 205 | 204 | 207 |
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. |
