“Warm climate makes full-bodied wine” is a useful shortcut until it is not. Temperature influences the vine’s pace, but variety, available water, aspect, yield, harvest decisions, and winemaking all take part in the result.
Heat accumulation is not average temperature
Growing degree days accumulate heat above a base during the growing season. The measure helps compare places when the method, period, and weather station are compatible. On its own, it does not describe cool nights, heat waves, or rainfall distribution.
Water changes the path
Annual rainfall says little without seasonality. The same total can arrive in winter, during flowering, or near harvest. Soil and rooting depth change how much remains available. This is why the atlas presents figures as context, not as a verdict.
Harvest is a decision
The producer chooses when to pick within the vintage’s limits. Sugar, acidity, aroma compounds, and phenolic maturity do not advance as one clock. When comparing styles, look for the chain of decisions before attributing everything to climate.
Continue at the source
The OIV maintains viticulture definitions and technical documents that help distinguish standardized metrics from editorial language.