What is made here
Wine colours
Colours the rules allow. Pick a colour to filter the rules and grapes below.
Where it is
Slovenska Istra in Slovenia
- Latitude
- 45.4°–45.6° N
- Vineyard altitude
- 13 m to 390 m
- Production zone
- 75,620 ha
Boundary drawn from whole communes, so it is a little larger than the legal zone. Boundary: Eurac Research PDO inventory (CC0). Country outlines: Natural Earth. Dots on the zone map are the vineyard points used for climate.
Showing every colour The colour filter changes the rules and grapes. Climate, vintages and soils describe the vineyards, so they stay the same.
01 · What the law says
The rules
Limits on grapes, yields, ripeness and ageing that every wine labelled Slovenska Istra must meet.
Other varieties allowed
Besides the main grapes, the rules allow these varieties in some wines. Grape names link where a profile exists.
15 varieties · Slovenska Istra kakovostno peneče vino ZGP, Slovenska Istra vrhunsko peneče vino ZGP
Beli Pinot, Cabernet Franc, Cabernet Sauvignon, Chardonnay, Cipro, Gamay, Malocrn, Malvazija, Merlot, Modri Pinot, Refošk, Rumeni Muškat, Sauvignon Blanc, Sivi Pinot, Syrah
02 · Climate fingerprint
The climate
The growing season averages 18.2 °C, warm on Gregory Jones's scale, with 1,765 growing degree days (Winkler III).
The average year 1991–2020, vineyards at about 163 m
Monthly mean, °CRain, mmGrowing season
- Growing-season temperature
- 18.2 °C
- Warm · 17–19 °C (Jones)
- Growing degree days
- 1,765
- Region III: 1,667–1,943 degree days
- Growing-season rain
- 764 mm
- Of 1,310 mm a year
- Harvest rain
- 301 mm
- September–October
Copernicus ERA5-Land monthly averages at 5 vineyard points (Vineyard point 1, 12 m; Vineyard point 2, 390 m; Vineyard point 3, 57 m; Vineyard point 4, 325 m; Vineyard point 5, 32 m), moved to each point's height from the model's terrain. Indices that need daily data are not captured yet. How the climate figures are made.
Lower confidence:Monthly reanalysis in moderately complex terrain; not yet checked against a weather station.
Closest climates in the database
Picked by the data, not by hand: the profiles nearest on season warmth (counted twice), degree days, rain, ripening-month nights and day–night range. Neighbours within 30 km are left out, as they share the same weather.
1. Lessini DurelloVery similarCompared with Slovenska Istra: same season warmth, similar rain.
2. Recioto di SoaveVery similarCompared with Slovenska Istra: same season warmth, similar rain.
3. Soave SuperioreVery similarCompared with Slovenska Istra: same season warmth, similar rain.
Growing-season temperature
Growing degree days
Growing-season rain
03 · Year by year
35 vintages
Each column is one growing season: heat above or below the 1991–2020 average, and rain at harvest. Pick a year for the details.
Warmer than averageCooler than averageHarvest rain (Sep–Oct)Average harvest rain, 301 mm
2025
- Growing-season temp.
- Growing degree days
- Harvest rain
- Growing-season rain
- September nights
- Hot days and frosts
Seasons are labelled by harvest year (April–October). Year-to-year changes from ERA5-Land; tested against station records in Alto Adige (r = 0.94 for season temperature at Bolzano). Rain varies more locally, so treat single-season rain with some caution. Vintage ratings, harvest dates and frost or hail events have places in the data model but are not loaded yet.
04 · Where the numbers come from
Sources
- A geospatial inventory of regulatory information for wine protected designations of origin in Europe · Candiago et al., Scientific Data 9, 394 (2022); Eurac Research · CC0
- ERA5-Land monthly averaged data (reanalysis-era5-land-monthly-means) · Copernicus Climate Change Service (C3S), Climate Data Store · CC BY 4.0 (Copernicus licence)
- OpenStreetMap vineyard areas (landuse=vineyard), from Geofabrik country extracts · OpenStreetMap contributors · ODbL 1.0
- Copernicus DEM GLO-90 (AWS open data tiles) · European Space Agency / Copernicus · Copernicus DEM licence
- Product specification: Slovenska Istra (SPECIFIKACIJA PROIZVODA- Slovenska Istra.doc) · National authority, as filed in the EU register (eAmbrosia) · Official document
- Climate profiles calculated by Vinous: method
Still to check (3)
- Generated from EU reference data: check against the current product specification.
- From the specification: Subregions Priobalni pas and Šavrinsko gričevje. Varieties: white Malvazija, Chardonnay, Rumeni Muškat, Beli Pinot, Sivi Pinot, Sauvignon; red Refošk, Merlot, Cabernet Sauvignon, Maločrn, Cabernet Franc, Modri Pinot, Syrah, Gamay, Cipro. Yield limit is 8,000 litres of wine per hectare for all wines. Non-reducing extract minimum is 17 g/l for white and rosé, 20 g/l for red wines (applied to still wines); glycerol at least 5 g/l; ash at least 1.2/1.4/1.6 g/l (white/rosé/red). For vrhunsko (top-quality) wine, enrichment, sweetening, acidification and deacidification are not permitted. Sparkling wines come from a first and second alcoholic fermentation (method not specified), with the cuvée at least 9 % vol (kakovostno) or 9.5 % vol (vrhunsko) total alcohol. Slamno vino is made from grapes dried on straw or reeds, with no minimum drying period. Wines need an organoleptic score of at least 16. The 'Arhivsko vino' minimum of 83 °Oe is as printed (below the 84 °Oe of vrhunsko vino).
- National tier (DOC/DOCG) not captured yet; rules extracted from the specification text.