Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 74 | 67 | 74 | 76 | 83 | 99 |
| Tmin | 73 | 65 | 72 | 72 | 81 | 94 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 101 | 91 | 103 | 100 | 100 | 106 |
| Humidity/Visibility | 88 | 80 | 86 | 85 | 88 | 98 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 113 | 113 | 113 | 103 | 96 | 91 |
| Tmin | 112 | 114 | 108 | 106 | 99 | 101 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 128 | 128 | 122 | 124 | 132 |
| Humidity/Visibility | 119 | 118 | 110 | 113 | 113 | 117 |
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. |
Ashgabat