 They are usually more common in springtime and they would elevate fire danger due to their warm nature and dry nature.Unlike the Föhn effect in the region, katabatic winds are occasionally warm and not associated with a rain shadow, meaning there is usually no precipitation and cold weather on the upwind side of the mountain ranges.Sydney's climate appears to be becoming drier; The city has had fewer rain days in recent years than shown in the long-term climate table above.