Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1068 | 970 | 1062 | 1064 | 1092 | 1069 |
| Tmin | 1076 | 974 | 1069 | 1065 | 1094 | 1074 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 155 | 142 | 157 | 172 | 186 | 180 |
| Humidity/Visibility | 151 | 136 | 150 | 165 | 176 | 172 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1103 | 1104 | 1067 | 1100 | 1072 | 1094 |
| Tmin | 1111 | 1109 | 1075 | 1107 | 1078 | 1107 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 188 | 180 | 184 | 182 | 186 |
| Humidity/Visibility | 173 | 176 | 169 | 173 | 175 | 182 |
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. |
