Climate of Coffs Harbour


Coffs Harbour Jetty Coffs Harbour's climate is subtropical with warm to very warm wet summers and cool to mild dry winters.
The main factor controlling the climate of the region is the transitional zone between the steady trade winds to the north and the anticyclone belt to the south which oscillates northwards and southwards over the region annually.

At the beginning of the year the anticyclonic belt is well south of the region. Consequently, warm, humid conditions associated with the easterly trades are experienced. The anticyclone belt begins to move northward during April and generally lies over the region by July. Rainfall averages and the water vapour content of the air decreases during this period. From July to September, the anticyclone belt is over, or slightly north of the region. this period is the relatively dry season of the year and light winds and clear skies are associated with the anticyclone centres are conducive to the formation of frosts at places away from the immediate coast, even though there is a relatively warm ocean to the east of the region. In November, humid conditions return and rainfall averages increase as the anticyclone belt moves well south of the area. From January to April rain depressions from ex - tropical cyclones from the north may effect the region.

The proximity of the coast ensures that the temperatures are moderated by the influence of the sea. Summer days are generally cooled by a sea breeze, and winters are not as cold as in the inland regions. The proximity of the ranges west of Coffs Harbour means that the cooling sea breezes do not penetrate more than a few kilometres from the coast, resulting in warmer temperatures inland than on the coastal fringe. The climate is pleasant most of the year, although humidity may be uncomfortable some days in the warmer months. Coffs Harbour is usually south of the area affected by strong tropical cyclones.
Coffs Harbour Lookout
Average maximum temperatures range from 19oC in winter to 27oC in Summer while average minimum temperatures range from 7oC in winter to 19oC in summer. Annual mean rainfall is 1704mm, with the wettest month, March having 248mm and the driest month, September, receiving 62mm. The mountain ranges inland from Coffs Harbour receive more rain than the coast, as moist onshore winds are forced to rise, causing convective precipitation.

Winds

In the mornings, particularly in the cooler months of the year, the direction and speed of the local winds are markedly dependent on the topography of each site.
Coffs Harbour Jetty
From April to November winds blow most frequently from the NE to the SE. From June to August the winds blow most from the SW to NW. The remaining months are generally transitional from one regime to the other.

Winds are strongest on the coast and decrease inland, the greatest difference occuring in the summer months. There is a diurnal effect with the wind strength, where winds are strongest in the afternoons and light or calm overnight and in the morning.

Strong wind gusts affect the region from time to time is association with meteorological phenomena such as the passage of cold fronts, severe local storms or ex - tropical cyclones.