Number of days available for climatic review
| Parameter | Jan | Feb | Mär | Apr | Mai | Jun |
| Tmax | 704 | 644 | 708 | 686 | 708 | 681 |
| Tmin | 708 | 643 | 706 | 685 | 705 | 682 |
| Sonnenscheindauer | 277 | 279 | 212 | 324 | 274 | 260 |
| Niederschlag | 155 | 141 | 157 | 153 | 157 | 149 |
| Feuchte/Sicht | 150 | 138 | 149 | 144 | 147 | 142 |
| Parameter | Jul | Aug | Sep | Okt | Nov | Dez |
| Tmax | 710 | 707 | 712 | 736 | 708 | 738 |
| Tmin | 701 | 708 | 713 | 735 | 710 | 737 |
| Sonnenscheindauer | 271 | 274 | 352 | 329 | 294 | 330 |
| Niederschlag | 158 | 161 | 182 | 184 | 182 | 187 |
| Feuchte/Sicht | 149 | 150 | 170 | 170 | 172 | 178 |
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. |
Alor Setar