Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 721 | 662 | 728 | 706 | 722 | 701 |
| Tmin | 751 | 688 | 747 | 731 | 742 | 726 |
| Duration of sunshine | 217 | 254 | 248 | 210 | 248 | 300 |
| Precipitation | 186 | 170 | 186 | 181 | 190 | 181 |
| Humidity/Visibility | 167 | 152 | 166 | 159 | 164 | 160 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 729 | 728 | 723 | 743 | 729 | 747 |
| Tmin | 755 | 757 | 738 | 772 | 758 | 752 |
| Duration of sunshine | 279 | 248 | 300 | 279 | 210 | 217 |
| Precipitation | 189 | 193 | 216 | 218 | 212 | 191 |
| Humidity/Visibility | 166 | 168 | 185 | 190 | 190 | 187 |
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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