Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1199 | 1084 | 1200 | 1158 | 1199 | 1159 |
| Tmin | 1087 | 981 | 1089 | 1051 | 1089 | 1050 |
| Duration of sunshine | 93 | 113 | 124 | 150 | 124 | 120 |
| Precipitation | 131 | 113 | 123 | 124 | 127 | 122 |
| Humidity/Visibility | 112 | 107 | 111 | 106 | 108 | 106 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1195 | 1195 | 1158 | 1198 | 1159 | 1202 |
| Tmin | 1088 | 1089 | 1052 | 1086 | 1050 | 1088 |
| Duration of sunshine | 155 | 124 | 150 | 155 | 120 | 155 |
| Precipitation | 132 | 133 | 130 | 125 | 128 | 130 |
| Humidity/Visibility | 107 | 113 | 105 | 110 | 108 | 115 |
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. |
