Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1044 | 965 | 1065 | 1070 | 1084 | 1042 |
| Tmin | 1051 | 966 | 1066 | 1065 | 1090 | 1051 |
| Duration of sunshine | 93 | 84 | 155 | 60 | 93 | 30 |
| Precipitation | 723 | 673 | 729 | 747 | 764 | 738 |
| Humidity/Visibility | 80 | 73 | 85 | 94 | 111 | 106 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1086 | 1049 | 1022 | 1058 | 1027 | 1053 |
| Tmin | 1088 | 1045 | 1025 | 1068 | 1029 | 1062 |
| Duration of sunshine | 0 | 93 | 150 | 62 | 90 | 155 |
| Precipitation | 768 | 772 | 736 | 752 | 719 | 140 |
| Humidity/Visibility | 104 | 86 | 107 | 108 | 102 | 106 |
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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