Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1198 | 1091 | 1206 | 1163 | 1201 | 1162 |
| Tmin | 1199 | 1091 | 1203 | 1168 | 1200 | 1160 |
| Duration of sunshine | 270 | 275 | 305 | 324 | 269 | 256 |
| Precipitation | 155 | 141 | 157 | 155 | 157 | 150 |
| Humidity/Visibility | 151 | 137 | 150 | 143 | 148 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1205 | 1202 | 1194 | 1223 | 1189 | 1237 |
| Tmin | 1197 | 1201 | 1195 | 1220 | 1193 | 1233 |
| Duration of sunshine | 333 | 274 | 318 | 331 | 230 | 293 |
| Precipitation | 161 | 163 | 182 | 184 | 180 | 186 |
| Humidity/Visibility | 149 | 151 | 170 | 172 | 171 | 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. |
