Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 270 | 243 | 272 | 270 | 274 | 250 |
| Tmin | 308 | 280 | 305 | 299 | 305 | 284 |
| Duration of sunshine | 169 | 135 | 108 | 134 | 137 | 131 |
| Precipitation | 344 | 315 | 350 | 349 | 351 | 317 |
| Humidity/Visibility | 56 | 50 | 64 | 63 | 59 | 30 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 264 | 259 | 251 | 250 | 247 | 262 |
| Tmin | 286 | 296 | 297 | 279 | 273 | 290 |
| Duration of sunshine | 161 | 200 | 204 | 152 | 152 | 135 |
| Precipitation | 346 | 365 | 359 | 340 | 342 | 353 |
| Humidity/Visibility | 36 | 53 | 61 | 32 | 31 | 51 |
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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