Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1189 | 1077 | 1208 | 1191 | 1234 | 1188 |
| Tmin | 1188 | 1076 | 1206 | 1183 | 1222 | 1182 |
| Duration of sunshine | 248 | 254 | 279 | 240 | 279 | 300 |
| Precipitation | 124 | 114 | 126 | 145 | 156 | 151 |
| Humidity/Visibility | 122 | 111 | 121 | 140 | 147 | 146 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1236 | 1238 | 1195 | 1228 | 1197 | 1238 |
| Tmin | 1225 | 1228 | 1185 | 1224 | 1195 | 1237 |
| Duration of sunshine | 279 | 248 | 240 | 279 | 240 | 248 |
| Precipitation | 156 | 158 | 153 | 152 | 151 | 157 |
| Humidity/Visibility | 149 | 148 | 143 | 147 | 146 | 152 |
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. |
