02 · Place Beginner

Cool and warm climate styles

Where a grape grows determines what ends up in the glass. Growing-season temperature is the single most powerful influence on a wine's acidity, alcohol, fruit character and body — more so than winemaking technique in most cases.

Cool vs warm: what changes in the glass

Characteristic Cool climate Warm climate

Acidity High — grapes ripen slowly, retaining malic acid Lower — heat metabolises acid faster during ripening

Alcohol Lower — less sugar accumulation from slower ripening Higher — riper grapes contain more sugar, which converts to alcohol

Fruit character Green apple, citrus, red berry, floral; more herbal notes Ripe stone fruit, tropical fruit, dark berry, jam; less herbaceousness

Tannin (reds) Finer, more restrained; can be green/harsh if underripe Riper, more rounded; can be soft to the point of flabbiness if too hot

Body Lighter to medium — less extract, less alcohol Medium to full — more extract and alcohol adds weight

Ageing potential Often higher — acidity and structure protect wine over time Can age well at top level; many made to drink sooner

Why temperature matters so much

During ripening, grapes accumulate sugars (which become alcohol after fermentation) while metabolising acids. In cool climates, this process is slow — the season is longer, nights are cold, and the grape retains more of its natural malic and tartaric acid. In warm climates, fast ripening metabolises acid rapidly and builds up high sugar levels. The practical result: a cool-climate Chardonnay from Chablis will typically show 12.5% alcohol and high acidity; a warm-climate Chardonnay from the Barossa may show 14.5% alcohol and considerably softer acidity. Both are the same grape variety; the difference is almost entirely climatic.

Tannin in red wines is also affected. Cool climates that struggle to fully ripen thick-skinned grapes (like Cabernet Sauvignon) can produce green, harsh tannins from underripe seeds and skins. Warm climates ripen tannins more thoroughly, producing softer, rounder textures — but at the extreme, excessive heat can produce over-ripe, cooked or jammy character.

Regional examples

Champagne Cool

France

Very high acidity essential for sparkling base wines; chalk soils

Mosel Cool

Germany

Slate soils and steep slopes allow Riesling to ripen despite northern latitude

Burgundy (Chablis) Cool

France

Kimmeridgian limestone; mineral Chardonnay, lean and taut

Loire Valley Cool

France

Sauvignon Blanc (Sancerre), Chenin Blanc (Vouvray); Atlantic influence

Barossa Valley Warm

Australia

Old-vine Shiraz; low yields, concentrated fruit, high alcohol

Châteauneuf-du-Pape Warm

France

Grenache-dominant; galets (large stones) retain heat for ripening

Mendoza Warm / altitude

Argentina

High altitude moderates heat; Malbec with both ripe fruit and freshness

Marlborough Cool

New Zealand

Intense Sauvignon Blanc; cool nights preserve aromatics

Altitude: the warm-climate exception

Altitude reduces temperature: roughly 0.6°C per 100 metres of elevation. This means producers in warm regions can access cool-climate growing conditions by planting at height. Mendoza's best Malbec comes from vineyards above 900 m; Ribeira Sacra's steep schist slopes channel cool Atlantic air down the river gorges despite Spain's generally warm climate. The OIV has published research showing vineyards above 600 m are experiencing significantly slower temperature increases than lowland sites in the same region — an important buffer against climate change for quality wine production.

The same principle applies to coastal influence: maritime climates moderate temperature extremes. The Atlantic cools Bordeaux, the Loire and Galicia; the Pacific cools Marlborough and California's Sonoma Coast. This is why understanding geography — not just country — matters when reading a wine label. For more on how geography shapes regional identity and legal protection, see the Appellations explained guide.

Next steps

05 How to taste wine — identify acidity, body and tannin in the glass → Terroir — climate is one part of a larger picture → Style questionnaire — find out whether you prefer cool or warm climate styles

Sources: OIV (climate and viticulture research), WSET (viticulture and climate curricula), Australian Wine Research Institute (AWRI) (climate change and vineyard adaptation research), IPCC (climate change projections for agriculture), Jancis Robinson MW — Oxford Companion to Wine. Last updated: 2026-10-14. Corrections via the contact form.

Questions

About climate and wine style.

How does climate affect wine taste?

Temperature during the growing season determines how quickly grapes ripen. In cool climates, grapes ripen slowly, retaining natural acidity and developing more restrained, complex aromas (citrus, green apple, floral, herbal). In warm climates, grapes ripen faster, accumulating more sugar (which converts to higher alcohol) and developing riper, more intense fruit flavours (stone fruit, dark berry, tropical). Neither is inherently better — the difference produces different styles suited to different occasions and food pairings. Use the style questionnaire to identify which end of this spectrum suits your palate.

What is the difference between climate and terroir?

Climate is one component of terroir, but terroir is broader. Terroir includes climate (macroclimate for the region, mesoclimate for the local area, microclimate for the specific vineyard), plus soil type and structure, subsoil, topography (slope, aspect, altitude), and the interaction of all of these with viticulture and winemaking. Climate is the single most influential element of terroir, which is why regional climate discussion is the starting point for understanding any wine region.

Can a warm climate region produce fresh, high-acid wines?

Yes — altitude is the main mechanism. In warm regions like Mendoza (Argentina), Ribeira Sacra (Spain) or South Africa's Elgin, vineyards planted at altitude (above 600–800 m) experience cooler temperatures than the surrounding lowlands — enough to significantly slow ripening and preserve natural acidity. The OIV has published research showing vineyards above 600 m are experiencing slower warming effects than lower-altitude sites. Night-time temperature drops (diurnal temperature variation) also help preserve freshness and aromatics.

Is climate change making wine regions warmer?

Broadly yes. Average growing-season temperatures across most established wine regions have increased measurably since the 1980s. The effects include earlier harvests, higher natural alcohol, reduced natural acidity, and in some regions the viability of varieties that previously would not ripen. The Australian Wine Research Institute (AWRI) has published extensive research on vineyard adaptation strategies. The IPCC projects continued warming across most wine-producing regions through 2100. In northern Europe, warming has enabled new regions — most visibly England and southern Scandinavia — to produce quality sparkling wines from Champagne varieties. See the English sparkling wine record exports for context.

Which white grape varieties perform best in cool climates?

Riesling, Chardonnay (especially in Chablis and Champagne), Sauvignon Blanc (Loire, Marlborough), Pinot Gris (Alsace, northern Italy), Chenin Blanc (Loire) and Grüner Veltliner (Austria). These varieties ripen reliably in cool conditions and produce wines with defining acidity and aromatic complexity. In very cool climates, Riesling's late ripening and natural high acidity make it uniquely suited — it can ripen at 8–8.5° alcohol with enough residual sugar to balance the acidity. See the main grape varieties guide for flavour profiles of key cool-climate varieties.