Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 179 | 163 | 181 | 174 | 181 | 173 |
| Tmin | 179 | 162 | 181 | 177 | 181 | 169 |
| Duration of sunshine | 179 | 162 | 179 | 176 | 180 | 174 |
| Precipitation | 190 | 174 | 192 | 183 | 190 | 188 |
| Humidity/Visibility | 182 | 164 | 182 | 177 | 181 | 174 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 175 | 181 | 201 | 201 | 200 | 205 |
| Tmin | 179 | 179 | 205 | 206 | 201 | 210 |
| Duration of sunshine | 175 | 184 | 199 | 202 | 200 | 211 |
| Precipitation | 194 | 200 | 216 | 221 | 222 | 225 |
| Humidity/Visibility | 179 | 182 | 203 | 206 | 203 | 211 |
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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