Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 40 | 34 | 45 | 70 | 74 | 77 |
| Tmin | 54 | 55 | 58 | 82 | 90 | 77 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 91 | 99 | 123 | 130 | 120 |
| Humidity/Visibility | 40 | 35 | 41 | 57 | 62 | 60 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 59 | 82 | 78 | 73 | 72 | 79 |
| Tmin | 76 | 91 | 84 | 79 | 79 | 90 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 131 | 125 | 129 | 131 | 125 |
| Humidity/Visibility | 56 | 64 | 61 | 57 | 57 | 65 |
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. |
