Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1229 | 1147 | 1270 | 1226 | 1266 | 1224 |
| Tmin | 1078 | 1005 | 1114 | 1081 | 1104 | 1072 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 169 | 189 | 183 | 186 | 180 |
| Humidity/Visibility | 171 | 157 | 170 | 166 | 173 | 164 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1265 | 1265 | 1228 | 1290 | 1253 | 1270 |
| Tmin | 1107 | 1109 | 1054 | 1115 | 1104 | 1095 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 191 | 210 | 219 | 209 | 191 |
| Humidity/Visibility | 172 | 175 | 194 | 196 | 191 | 186 |
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. |
