Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1254 | 1145 | 1269 | 1202 | 1231 | 1200 |
| Tmin | 1256 | 1148 | 1266 | 1201 | 1229 | 1197 |
| Duration of sunshine | 155 | 254 | 248 | 270 | 248 | 300 |
| Precipitation | 186 | 168 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 165 | 183 | 176 | 184 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1237 | 1240 | 1216 | 1261 | 1223 | 1266 |
| Tmin | 1237 | 1242 | 1216 | 1262 | 1226 | 1267 |
| Duration of sunshine | 279 | 310 | 240 | 248 | 180 | 0 |
| Precipitation | 185 | 189 | 211 | 214 | 210 | 216 |
| Humidity/Visibility | 182 | 184 | 205 | 208 | 206 | 214 |
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. |
