Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 27 | 25 | 24 | 0 | 0 | 0 |
| Tmin | 28 | 26 | 24 | 0 | 0 | 0 |
| Duration of sunshine | 28 | 23 | 21 | 0 | 0 | 0 |
| Precipitation | 62 | 56 | 61 | 82 | 64 | 59 |
| Humidity/Visibility | 39 | 38 | 37 | 34 | 40 | 42 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 0 | 0 | 0 | 0 | 0 | 0 |
| Tmin | 0 | 0 | 0 | 0 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 62 | 51 | 55 | 97 | 88 | 93 |
| Humidity/Visibility | 42 | 33 | 36 | 60 | 48 | 58 |
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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