Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1236 | 1140 | 1259 | 1221 | 1253 | 1218 |
| Tmin | 1209 | 1105 | 1231 | 1191 | 1226 | 1192 |
| Duration of sunshine | 62 | 169 | 124 | 90 | 62 | 90 |
| Precipitation | 186 | 171 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 165 | 155 | 169 | 164 | 171 | 164 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1258 | 1258 | 1237 | 1287 | 1247 | 1262 |
| Tmin | 1235 | 1235 | 1216 | 1254 | 1218 | 1260 |
| Duration of sunshine | 93 | 31 | 60 | 93 | 120 | 93 |
| Precipitation | 188 | 188 | 212 | 217 | 209 | 192 |
| Humidity/Visibility | 168 | 170 | 185 | 192 | 189 | 180 |
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. |
