Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 56 | 69 | 78 | 56 | 65 | 59 |
| Tmin | 76 | 70 | 82 | 67 | 75 | 67 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 105 | 90 | 98 | 98 | 98 | 120 |
| Humidity/Visibility | 57 | 62 | 75 | 61 | 67 | 63 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 81 | 57 | 53 | 52 | 47 | 46 |
| Tmin | 87 | 57 | 53 | 58 | 50 | 54 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 127 | 121 | 114 | 142 | 142 |
| Humidity/Visibility | 93 | 91 | 82 | 89 | 74 | 85 |
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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