Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1174 | 1056 | 1201 | 1174 | 1194 | 1161 |
| Tmin | 1156 | 1054 | 1187 | 1165 | 1186 | 1145 |
| Duration of sunshine | 93 | 141 | 93 | 90 | 62 | 30 |
| Precipitation | 160 | 142 | 177 | 181 | 183 | 184 |
| Humidity/Visibility | 128 | 117 | 136 | 133 | 141 | 136 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1184 | 1163 | 1160 | 1238 | 1183 | 1227 |
| Tmin | 1179 | 1161 | 1159 | 1221 | 1175 | 1227 |
| Duration of sunshine | 93 | 93 | 90 | 62 | 0 | 62 |
| Precipitation | 187 | 176 | 181 | 205 | 199 | 187 |
| Humidity/Visibility | 140 | 136 | 143 | 151 | 153 | 165 |
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. |
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