Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1066 | 980 | 1099 | 1063 | 1080 | 1054 |
| Tmin | 1077 | 983 | 1100 | 1068 | 1084 | 1064 |
| Duration of sunshine | 234 | 155 | 207 | 207 | 240 | 224 |
| Precipitation | 110 | 112 | 120 | 114 | 104 | 94 |
| Humidity/Visibility | 84 | 70 | 74 | 65 | 64 | 75 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1099 | 1088 | 1061 | 1099 | 1073 | 1123 |
| Tmin | 1096 | 1090 | 1061 | 1098 | 1074 | 1128 |
| Duration of sunshine | 227 | 221 | 223 | 261 | 204 | 229 |
| Precipitation | 104 | 106 | 97 | 109 | 128 | 146 |
| Humidity/Visibility | 53 | 42 | 71 | 77 | 104 | 112 |
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. |
