Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1237 | 1140 | 1209 | 1208 | 1258 | 1216 |
| Tmin | 1207 | 1114 | 1198 | 1183 | 1232 | 1194 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 169 | 186 | 179 | 186 | 179 |
| Humidity/Visibility | 156 | 148 | 161 | 150 | 161 | 153 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1250 | 1243 | 1242 | 1272 | 1212 | 1256 |
| Tmin | 1220 | 1214 | 1214 | 1251 | 1211 | 1261 |
| Duration of sunshine | 0 | 2 | 10 | 0 | 0 | 0 |
| Precipitation | 184 | 186 | 210 | 206 | 182 | 187 |
| Humidity/Visibility | 157 | 159 | 187 | 184 | 169 | 179 |
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. |
