Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 83 | 60 | 79 | 100 | 113 | 99 |
| Tmin | 93 | 73 | 78 | 98 | 107 | 100 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 148 | 127 | 151 | 164 | 174 | 157 |
| Humidity/Visibility | 53 | 42 | 52 | 63 | 69 | 61 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 95 | 90 | 84 | 94 | 84 | 87 |
| Tmin | 89 | 97 | 92 | 95 | 82 | 91 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 161 | 161 | 150 | 155 | 167 | 186 |
| Humidity/Visibility | 57 | 56 | 54 | 59 | 55 | 59 |
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. |
