Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1168 | 1079 | 1197 | 1182 | 1218 | 1193 |
| Tmin | 1170 | 1080 | 1197 | 1183 | 1226 | 1171 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 120 | 126 | 146 | 157 | 150 |
| Humidity/Visibility | 117 | 99 | 114 | 132 | 143 | 139 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1215 | 1228 | 1185 | 1216 | 1161 | 1203 |
| Tmin | 1229 | 1230 | 1194 | 1208 | 1168 | 1208 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 153 | 157 | 152 | 145 | 120 | 138 |
| Humidity/Visibility | 143 | 142 | 141 | 134 | 117 | 129 |
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. |
