Spanish Wine Region Climate Calculator

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Spanish Wine Region Climate Calculator

Evaluate climate suitability for major Spanish wine regions by calculating Growing Degree Days (GDD), Huglin Index, and Dryness Index to determine grape variety compatibility.

Wine Region

Custom / Enter Manually Rioja Ribera del Duero Priorat Rías Baixas Jerez (Sherry) Penedès Rueda Toro

Mean Growing Season Temperature (Apr–Oct) (°C)

Mean Daily Maximum Temperature (Apr–Oct) (°C)

Mean Daily Minimum Temperature (Apr–Oct) (°C)

Annual Rainfall (mm)

Summer Rainfall Jun–Aug (mm)

Altitude (m above sea level)

Mean Annual Sunshine Hours

Calculate Climate Suitability

Enter climate data or select a region above to see results.

const spaRegionData = { "rioja": { meanTemp: 14.5, maxTemp: 21.5, minTemp: 7.5, annualRain: 450, summerRain: 65, altitude: 450, sunshine: 2500 }, "ribera": { meanTemp: 12.5, maxTemp: 20.5, minTemp: 4.5, annualRain: 450, summerRain: 55, altitude: 850, sunshine: 2400 }, "priorat": { meanTemp: 16.5, maxTemp: 25.0, minTemp: 8.0, annualRain: 550, summerRain: 50, altitude: 400, sunshine: 2700 }, "rias-baixas":{ meanTemp: 14.0, maxTemp: 19.5, minTemp: 8.5, annualRain: 1600, summerRain: 200, altitude: 50, sunshine: 1900 }, "jerez": { meanTemp: 19.5, maxTemp: 27.5, minTemp: 11.5, annualRain: 600, summerRain: 15, altitude: 30, sunshine: 3100 }, "penedes": { meanTemp: 15.5, maxTemp: 22.0, minTemp: 9.0, annualRain: 550, summerRain: 80, altitude: 200, sunshine: 2600 }, "rueda": { meanTemp: 13.0, maxTemp: 21.0, minTemp: 5.0, annualRain: 380, summerRain: 45, altitude: 750, sunshine: 2500 }, "toro": { meanTemp: 13.5, maxTemp: 22.0, minTemp: 5.0, annualRain: 350, summerRain: 40, altitude: 700, sunshine: 2600 } };

function spaLoadRegionDefaults() { const region = document.getElementById("spa-region").value; if (region === "custom") { ["spa-mean-temp","spa-max-temp","spa-min-temp","spa-annual-rain","spa-summer-rain","spa-altitude","spa-sunshine"] .forEach(id => document.getElementById(id).value = ""); return; } const d = spaRegionData[region]; document.getElementById("spa-mean-temp").value = d.meanTemp; document.getElementById("spa-max-temp").value = d.maxTemp; document.getElementById("spa-min-temp").value = d.minTemp; document.getElementById("spa-annual-rain").value = d.annualRain; document.getElementById("spa-summer-rain").value = d.summerRain; document.getElementById("spa-altitude").value = d.altitude; document.getElementById("spa-sunshine").value = d.sunshine; }

function spaCalc() { const resultDiv = document.getElementById("spa-result");

const meanTemp = parseFloat(document.getElementById("spa-mean-temp").value); const maxTemp = parseFloat(document.getElementById("spa-max-temp").value); const minTemp = parseFloat(document.getElementById("spa-min-temp").value); const annualRain = parseFloat(document.getElementById("spa-annual-rain").value); const summerRain = parseFloat(document.getElementById("spa-summer-rain").value); const altitude = parseFloat(document.getElementById("spa-altitude").value); const sunshine = parseFloat(document.getElementById("spa-sunshine").value);

// Validation const errors = []; if (isNaN(meanTemp) || meanTemp 35) errors.push("Mean growing season temperature must be between 5°C and 35°C."); if (isNaN(maxTemp) || maxTemp 45) errors.push("Mean daily maximum temperature must be between 5°C and 45°C."); if (isNaN(minTemp) || minTemp 30) errors.push("Mean daily minimum temperature must be between -5°C and 30°C."); if (isNaN(annualRain) || annualRain 3000) errors.push("Annual rainfall must be between 0 and 3000 mm."); if (isNaN(summerRain) || summerRain 1000) errors.push("Summer rainfall must be between 0 and 1000 mm."); if (isNaN(altitude) || altitude 3000) errors.push("Altitude must be between 0 and 3000 m."); if (isNaN(sunshine) || sunshine 4000) errors.push("Sunshine hours must be between 500 and 4000."); if (!isNaN(maxTemp) && !isNaN(minTemp) && maxTemp annualRain) errors.push("Summer rainfall cannot exceed annual rainfall.");

if (errors.length > 0) { resultDiv.innerHTML = "Please fix the following errors:" + errors.map(e => "").join("") + ""; return; }

// ── 1. Growing Degree Days (GDD) base 10°C, Apr–Oct = 214 days ────────── // GDD = (Tmax + Tmin) / 2 - Tbase) × days, clamped so daily contribution ≥ 0 const Tbase = 10; const growingDays = 214; const dailyGDD = Math.max(0, ((maxTemp + minTemp) / 2) - Tbase); const GDD = dailyGDD * growingDays;

// ── 2. Huglin Index (HI) ───────────────────────────────────────────────── // HI = Σ[(Tmax + Tmean)/2 - 10] × k, where k = latitude coefficient // For Spain (36°–44°N) k ≈ 1.02–1.06; we use 1.04 as representative const k = 1.04; const HI = ((maxTemp + meanTemp) / 2 - 10) * growingDays * k;

// ── 3. Dryness Index (DI) ──────────────────────────────────────────────── // Simplified Riou Dryness Index: // DI = W0 + P - Tv // W0 = initial soil water reserve = 200 mm (standard assumption) // P = growing season precipitation (estimated as 60% of annual for Spain) // Tv = potential evapotranspiration ≈ 6.75 × meanTemp (simplified Hargreaves) const W0 = 200; const growingSeasonRain = annualRain * 0.60; const Tv = 6.75 * meanTemp; const DI = W0 + growingSeasonRain - Tv;

// ── 4. Diurnal Temperature Range (DTR) ────────────────────────────────── const DTR = maxTemp - minTemp;

// ── 5. Altitude temperature correction ────────────────────────────────── // Lapse rate: -0.65°C per 100 m const altTempCorrection = -(altitude / 100) * 0.65;

// ── 6. Sunshine suitability score (0–100) ─────────────────────────────── // Optimal for Spanish viticulture: 2200–3000 h let sunshineSuitability; if (sunshine >= 2200 && sunshine 3000)"; hiColor = "#8e44ad"; }

// ── 8. Classify DI ────────────────────────────────────────────────────── let diClass, diColor; if (DI > 150) { diClass = "Humid (> 150 mm)"; diColor = "#3498db"; } else if (DI > 50) { diClass = "Sub-humid (50–150 mm)"; diColor = "#2ecc71"; } else if (DI > -100) { diClass = "Sub-arid (-100 to 50 mm)"; diColor = "#f1c40f"; } else if (DI > -200) { diClass = "Arid (-200 to -100 mm)"; diColor = "#e67e22"; } else { diClass = "Very Arid (= 1500 && HI = -100 && DI 150) diScore = Math.max(0, 100 - (DI - 150) * 0.5); else diScore = Math.max(0, 100 - Math.abs(DI + 100) * 0.3);

// DTR: optimal 12–18°C for quality let dtrScore; if (DTR >= 12 && DTR = 80) { suitabilityLabel = "Excellent"; suitabilityColor = "#27ae60"; } else if (overallScore >= 65) { suitabilityLabel = "Good"; suitabilityColor = "#2ecc71"; } else if (overallScore >= 50) { suitabilityLabel = "Moderate"; suitabilityColor = "#f39c12"; } else if (overallScore >= 35) { suitabilityLabel = "Marginal"; suitabilityColor = "#e67e22"; } else { suitabilityLabel = "Poor"; suitabilityColor = "#e74c3c"; }

// ── 12. Irrigation need estimate ───────────────────────────────────────── // Simplified: if DI Overall Suitability: ${suitabilityLabel} (${overallRounded}/100)

Index / Metric Value Classification

Huglin Index (HI) ${HI.toFixed(0)} ${hiClass}

Growing Degree Days (GDD, base 10°C) ${GDD.toFixed(0)} °C·days ${gddClass}

Dryness Index (DI) ${DI.toFixed(0)} mm ${diClass}

Diurnal Temperature Range (DTR) ${DTR.toFixed(1)} °C ${DTR >= 12 && DTR

Altitude Temperature Effect ${altTempCorrection.toFixed(2)} °C vs. sea level baseline

Sunshine Suitability Score ${sunshineSuitability.toFixed(0)}/100 ${sunshine.toFixed(0)} h/year

Irrigation Need ${irrigationNeed}

Recommended Grape Varieties: ${varieties.join(" • ")}

Score Breakdown: HI suitability ${hiScore.toFixed(0)}/100 (×0.40) | DI suitability ${diScore.toFixed(0)}/100 (×0.35) | Sunshine ${sunshineSuitability.toFixed(0)}/100 (×0.15) | DTR ${dtrScore.toFixed(0)}/100 (×0.10)

`; }

#### Formulas Used

1. Growing Degree Days (GDD) — Winkler (1974): GDD = max(0, (Tmax + Tmin) / 2 − 10) × 214 days Base temperature 10°C; growing season April–October (214 days).

2. Huglin Index (HI) — Huglin (1978): HI = Σ[(Tmax + Tmean) / 2 − 10] × k where k = latitude coefficient (1.04 for Spain, 36°–44°N), summed over Apr–Oct.

3. Dryness Index (DI) — Riou et al. (1994): DI = W₀ + P − Tv W₀ = 200 mm (initial soil water reserve); P = growing season precipitation (60% of annual); Tv = potential evapotranspiration ≈ 6.75 × Tmean (simplified Hargreaves).

4. Altitude Temperature Correction: ΔT = −0.65°C per 100 m altitude (standard atmospheric lapse rate).

5. Overall Suitability Score: Score = (HI_score × 0.40) + (DI_score × 0.35) + (Sunshine_score × 0.15) + (DTR_score × 0.10)

#### Assumptions & References

Evapotranspiration uses a simplified Hargreaves coefficient (6.75 × Tmean); full Penman-Monteith requires additional radiation and humidity data.
References: Huglin P. (1978) Nouveau mode d'évaluation des possibilités héliothermiques d'un milieu viticole; Winkler A.J. et al. (1974) General Viticulture; Riou C. et al. (1994) Le déterminisme climatique de la maturation du raisin; OIV Resolution OIV-VITI 423-2012.

Spanish Wine Region Climate Calculator

Spanish Wine Region Climate Calculator

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Spanish Wine Region Climate Calculator

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