Reference — Temperature & Wind¶

How temperature moves the ball. Numbers are calibrated at 20°C, no wind. As it cools, three things stack: denser cold air, a stiffer (less lively) ball, and extra layers restricting your turn and clubhead speed. The model is roughly −5.5% at 6°C, −2.5% at 13°C, baseline at 20°C, and +1.5% at 27°C. The loss going cold is bigger than the gain going hot — that's the clothing tax. This model and the wind regimes below are course-independent.

Club distances by temperature (metres)¶

Club	6°C	13°C	20°C	27°C
Driver	241	249	255	259
3-wood	213	219	225	228
Hybrid	187	193	198	201
4-iron	168	174	178	181
5-iron	158	163	167	170
6-iron	147	152	156	158
7-iron	138	142	146	148
8-iron	129	133	136	138
9-iron	118	122	125	127
PW	108	111	114	116
49°	96	99	102	104
54°	87	90	92	93
58°	76	78	80	81

Driver / 3-wood / hybrid are total; irons & wedges are carry.

Reading the Christchurch wind off the temperature¶

Nor'wester (NW) — ~27°C. Warm, dry, often strong — the big one. Add +1 to +1.5 clubs into you, take −½ to −1 club downwind. A left-to-right cross fights your draw (hold it, aim less); a right-to-left cross stacks with your draw (aim well right, expect extra curve and a possible hook).

Cold southerly (S/SW) — ~6°C. Cold change off the south. Already losing ~5.5% to temperature — into this wind you can be two clubs short of your summer number, so commit to the extra stick and swing easy. Knockdowns hold their line better in your hook.

Easterly sea breeze — ~13–20°C. Lighter, cool, usually afternoon. This is the right-to-left breeze that adds to your draw, so favour right edges and let it work. Often calm in the morning.

Quick wind maths (your speed). Rough rule: ~1.5 m per 5 km/h of headwind on a 150 m shot — double it in a fresh nor'wester. Downwind gives about half that back. Crosswind aim-off: ~1 club-width per 10 km/h, more with your draw on a right-to-left day.

Driving clubs barely move across this temperature range, so most driving rows are stable. The real temperature levers are the par-3 clubs (they ladder up as it cools) and your approach numbers, which all lengthen in the cold. Plan the cold round around more club, easier swing.

McLeans data compiled & verified from the club's official guide. Coringa, Waitikiri and other courses are from public scorecard databases. Distances are on-card metres (yards convert at 1 m = 1.094 yd). Hole diagrams in the interactive version are schematic.