Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 905 | 840 | 918 | 900 | 943 | 925 |
| Tmin | 905 | 837 | 923 | 907 | 951 | 920 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 111 | 93 | 95 | 127 | 142 | 126 |
| Humidity/Visibility | 87 | 81 | 88 | 99 | 111 | 114 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 955 | 949 | 919 | 953 | 923 | 946 |
| Tmin | 958 | 956 | 916 | 954 | 924 | 950 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 134 | 122 | 126 | 132 | 148 |
| Humidity/Visibility | 120 | 119 | 118 | 116 | 109 | 114 |
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. |
Adam