Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1051 | 950 | 1052 | 1040 | 1083 | 1044 |
| Tmin | 1053 | 950 | 1054 | 1039 | 1084 | 1046 |
| Duration of sunshine | 123 | 109 | 124 | 140 | 154 | 145 |
| Precipitation | 124 | 112 | 124 | 148 | 155 | 155 |
| Humidity/Visibility | 122 | 111 | 122 | 141 | 152 | 144 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1078 | 1079 | 1047 | 1077 | 1048 | 1084 |
| Tmin | 1082 | 1083 | 1044 | 1077 | 1048 | 1084 |
| Duration of sunshine | 151 | 153 | 145 | 146 | 148 | 153 |
| Precipitation | 161 | 161 | 151 | 153 | 150 | 157 |
| Humidity/Visibility | 151 | 149 | 145 | 148 | 148 | 152 |
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. |
