How does climate affect wine?

Climate doesn't just influence wine — it defines it. A Pinot Noir grape grown in Burgundy (cool) versus Central Otago, New Zealand (cool but sunny) versus California's Russian River Valley (warm-moderate) produces three radically different wines from the same genetic material.

**Temperature** is king. Cool growing seasons (average below 16.5 °C) preserve acidity and produce wines with lower alcohol and restrained fruit — think Mosel Riesling at 8% ABV. Warm seasons (above 18.5 °C) accelerate sugar accumulation, producing fuller, riper wines at 14-15% ABV — like Barossa Shiraz.

But it's not just about average warmth. **Diurnal range** — the difference between day and night temperatures — is critical. A big swing (10 °C+) lets grapes develop sugar during warm days while preserving acidity during cool nights. This is why high-altitude vineyards in Mendoza (Argentina, 1,000-1,500m elevation) and Etna (Sicily, 600-1,000m) produce such vibrant, balanced wines.

**Rainfall** matters enormously. Too much during ripening swells berries (diluting flavour) and invites fungal diseases. Too little without irrigation stresses vines beyond recovery. The Mediterranean sweet spot — wet winters, dry summers — is why regions like Provence, the Douro Valley, and parts of Chile consistently deliver quality.

**Climate change** is reshaping everything. Harvest dates across Europe have advanced 2-3 weeks since 1980. England now produces world-class sparkling wine from chalk soils that mirror Champagne's geology. Burgundy is experimenting with Grenache and Mourvèdre — grapes that would have been unthinkable there a generation ago. Meanwhile, some traditional warm-climate regions are planting at higher altitudes or switching to drought-resistant varieties to survive.