3 degrees means absolutely no flavour to your beer. This is the temperature I will drink VB at. The beer shows head, carbonation, colour and nothing else. It is carbonated coloured water with alcohol. No flavour or aroma.
If you are in Darwin with an air temperature of 35 deg plus, after five minutes of pouring a beer at 3 deg, it has risen to 5-10 degrees. Time to pour another.
Anywhere else in the country, you are still drinking a very cold liquid.
Cold kills flavour and aroma. Wine drinkers know that a wine should be served at the correct temperature. The same with any self respecting beer drinker. 0-5 degrees for commercial swill. 5-10 degrees for a reasonable beer. 8-12 degrees for a good beer. Depending on the style, 5-12 degrees allows the real flavours of a good beer to shine through. At this range, the malt, hops and yeast flavours shine through showing the true balance of a beer.
If it is stinking hot and you have been doing any sort of activity, drink icy cold (lawn mower) water. Then enjoy a beer served at the correct temperature.
With any draught serving setup, you need to balance your serving pressure, carbonation levels and your cal temp.
Here in the central tabelands of NSW, it is 25 deg air temp, the glasses are at the same temp, the keg is a third full of Oktoberfest at about 6 degrees and the beer is pouring nectar. Off to grab another.