Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1195 | 1074 | 1191 | 1153 | 1182 | 1152 |
| Tmin | 1177 | 1067 | 1184 | 1150 | 1173 | 1142 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 169 | 188 | 181 | 186 | 180 |
| Humidity/Visibility | 173 | 157 | 173 | 170 | 170 | 170 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1184 | 1190 | 1178 | 1220 | 1185 | 1228 |
| Tmin | 1169 | 1178 | 1170 | 1210 | 1195 | 1225 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 169 | 171 | 192 | 198 | 201 | 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. |
