| Test Z | Q | Change/30 years | |
| Abha | −2.14* | −0.05 | −1.5 |
| Jeddah | −1.78+ | −0.04 | −1.2 |
| Dammam | −3.31** | −0.04 | −1.2 |
| Tabouk | −3.21** | −0.04 | −1.2 |
| Riyadh | −2.84** | −0.04 | −1.2 |
| Tmean | −2.78** | −0.04 | −1.2 |