Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1139 | 1036 | 1146 | 1118 | 1176 | 1136 |
| Tmin | 1142 | 1036 | 1145 | 1123 | 1176 | 1137 |
| Duration of sunshine | 84 | 77 | 88 | 93 | 116 | 112 |
| Precipitation | 93 | 88 | 93 | 110 | 129 | 122 |
| Humidity/Visibility | 89 | 81 | 89 | 103 | 121 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1173 | 1175 | 1137 | 1169 | 1137 | 1176 |
| Tmin | 1176 | 1176 | 1140 | 1172 | 1136 | 1176 |
| Duration of sunshine | 118 | 117 | 116 | 110 | 111 | 116 |
| Precipitation | 125 | 125 | 119 | 122 | 123 | 127 |
| Humidity/Visibility | 120 | 120 | 118 | 114 | 116 | 122 |
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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