Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 338 | 304 | 339 | 344 | 369 | 358 |
| Tmin | 335 | 298 | 337 | 334 | 363 | 356 |
| Duration of sunshine | 168 | 185 | 203 | 176 | 171 | 260 |
| Precipitation | 97 | 89 | 98 | 113 | 127 | 124 |
| Humidity/Visibility | 89 | 82 | 90 | 102 | 120 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 362 | 366 | 352 | 364 | 352 | 364 |
| Tmin | 362 | 362 | 352 | 362 | 355 | 367 |
| Duration of sunshine | 169 | 227 | 196 | 154 | 125 | 164 |
| Precipitation | 129 | 137 | 121 | 127 | 122 | 129 |
| Humidity/Visibility | 119 | 117 | 115 | 114 | 112 | 121 |
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. |
Altai