Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1050 | 980 | 1075 | 1040 | 1075 | 1048 |
| Tmin | 1056 | 981 | 1085 | 1048 | 1076 | 1047 |
| Duration of sunshine | 248 | 254 | 279 | 270 | 310 | 300 |
| Precipitation | 197 | 169 | 203 | 190 | 186 | 180 |
| Humidity/Visibility | 180 | 166 | 176 | 169 | 184 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1080 | 1073 | 1055 | 1103 | 1072 | 1106 |
| Tmin | 1083 | 1087 | 1064 | 1107 | 1076 | 1115 |
| Duration of sunshine | 310 | 310 | 300 | 310 | 240 | 279 |
| Precipitation | 188 | 200 | 228 | 216 | 216 | 226 |
| Humidity/Visibility | 183 | 177 | 194 | 207 | 204 | 209 |
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. |
