Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 80 | 65 | 100 | 104 | 121 | 113 |
| Tmin | 81 | 64 | 89 | 94 | 114 | 111 |
| Duration of sunshine | 61 | 49 | 58 | 68 | 88 | 99 |
| Precipitation | 142 | 138 | 157 | 162 | 184 | 170 |
| Humidity/Visibility | 87 | 79 | 96 | 99 | 120 | 113 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 98 | 91 | 93 | 115 | 86 | 112 |
| Tmin | 97 | 88 | 96 | 111 | 76 | 101 |
| Duration of sunshine | 90 | 82 | 83 | 94 | 60 | 81 |
| Precipitation | 169 | 177 | 192 | 163 | 174 | 194 |
| Humidity/Visibility | 102 | 93 | 98 | 112 | 84 | 113 |
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. |
Abu Njaym