Vintage weather atlas
2020 across wine regions
Compare growing-season heat and rain with the 1991–2020 average. These regional weather records describe the season, not wine quality.
Last Updated August 20, 2026 · Data through July 14, 2026 · 52 of 52 regions
Regional departures
Growing-season values compared with 1991–2020. Rows are ordered warmest to coolest.
Scroll horizontally for all columns and vertically for more regions.
| Region | Temperature | GDD | Rain | Season summary |
|---|---|---|---|---|
| ChampagneFrance | +1.5°C | +276 GDD | -93 mm | Warm weather can speed ripening and leave grapes with less acidity. Repeated hot days can speed ripening and put vines under stress. Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| LodiUnited States | +1.5°C | +347 GDD | -32 mm | Warm weather can speed ripening and leave grapes with less acidity. Repeated hot days can speed ripening and put vines under stress. |
| Santa Cruz MountainsUnited States | +1.4°C | +295 GDD | -28 mm | Warm weather can speed ripening and leave grapes with less acidity. Repeated hot days can speed ripening and put vines under stress. |
| Loire ValleyFrance | +1.0°C | +192 GDD | -24 mm | Warm weather can speed ripening and leave grapes with less acidity. |
| MoselGermany | +0.9°C | +142 GDD | -139 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. A freeze after budbreak can damage new growth and reduce the crop. |
| BurgundyFrance | +0.9°C | +163 GDD | -49 mm | Repeated hot days can speed ripening and put vines under stress. A freeze after budbreak can damage new growth and reduce the crop. |
| Napa ValleyUnited States | +0.9°C | +239 GDD | -104 mm | Repeated hot days can speed ripening and put vines under stress. Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Alsace & JuraFrance | +0.9°C | +158 GDD | -119 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. A freeze after budbreak can damage new growth and reduce the crop. |
| Rías BaixasSpain | +0.8°C | +152 GDD | -104 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Bierzo & ValdeorrasSpain | +0.8°C | +102 GDD | +32 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Paso Robles & Santa Barbara CountyUnited States | +0.7°C | +175 GDD | +41 mm | No single weather pattern stands out in the regional record. |
| DouroPortugal | +0.7°C | +141 GDD | -30 mm | No single weather pattern stands out in the regional record. |
| Southern OregonUnited States | +0.7°C | +129 GDD | -68 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| RiojaSpain | +0.6°C | +109 GDD | +11 mm | Frost exposure can vary sharply from one site to the next. |
| BordeauxFrance | +0.6°C | +117 GDD | +191 mm | Frequent rain can mean more canopy growth and more disease pressure. Rain close to harvest can raise rot pressure and shorten the picking window. |
| Columbia GorgeUnited States | +0.5°C | +79 GDD | -74 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. A freeze after budbreak can damage new growth and reduce the crop. |
| Trentino–Alto AdigeItaly | +0.5°C | +64 GDD | +87 mm | Rain close to harvest can raise rot pressure and shorten the picking window. A freeze after budbreak can damage new growth and reduce the crop. |
| PiedmontItaly | +0.5°C | +102 GDD | +12 mm | Frost exposure can vary sharply from one site to the next. |
| Sonoma & MendocinoUnited States | +0.5°C | +109 GDD | -52 mm | No single weather pattern stands out in the regional record. |
| Rhône ValleyFrance | +0.5°C | +107 GDD | -119 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. Frost exposure can vary sharply from one site to the next. |
| TasmaniaAustralia | +0.5°C | +36 GDD | +45 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Castilla y LeónSpain | +0.5°C | +70 GDD | +90 mm | Repeated hot days can speed ripening and put vines under stress. Frost exposure can vary sharply from one site to the next. |
| TuscanyItaly | +0.5°C | +95 GDD | +48 mm | Rain close to harvest can raise rot pressure and shorten the picking window. Frost exposure can vary sharply from one site to the next. |
| CorsicaFrance | +0.4°C | +87 GDD | +105 mm | Frequent rain can mean more canopy growth and more disease pressure. A freeze after budbreak can damage new growth and reduce the crop. |
| Walla Walla ValleyUnited States | +0.4°C | +114 GDD | -23 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Languedoc, Roussillon & ProvenceFrance | +0.4°C | +81 GDD | -48 mm | No single weather pattern stands out in the regional record. |
| MendozaArgentina | +0.4°C | +58 GDD | -143 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. A freeze after budbreak can damage new growth and reduce the crop. |
| Willamette ValleyUnited States | +0.3°C | +86 GDD | -80 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. Frost exposure can vary sharply from one site to the next. |
| Yakima & Central Columbia BasinUnited States | +0.3°C | +113 GDD | -23 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| MarlboroughNew Zealand | +0.3°C | +58 GDD | -45 mm | Frost exposure can vary sharply from one site to the next. |
| WachauAustria | +0.2°C | +12 GDD | +156 mm | Frequent rain can mean more canopy growth and more disease pressure. A freeze after budbreak can damage new growth and reduce the crop. |
| Po Valley & Northeast ItalyItaly | +0.2°C | +54 GDD | +67 mm | Rain close to harvest can raise rot pressure and shorten the picking window. Frost exposure can vary sharply from one site to the next. |
| Umbria & MarcheItaly | +0.2°C | +54 GDD | +44 mm | Frost exposure can vary sharply from one site to the next. |
| Jerez & SherrySpain | +0.1°C | +35 GDD | +66 mm | No single weather pattern stands out in the regional record. |
| SardiniaItaly | +0.1°C | +29 GDD | +2 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| CataloniaSpain | +0.1°C | +20 GDD | +92 mm | No single weather pattern stands out in the regional record. |
| EtnaItaly | +0.1°C | +11 GDD | -64 mm | Frost exposure can vary sharply from one site to the next. |
| Southern ApenninesItaly | +0.0°C | +9 GDD | +47 mm | No single weather pattern stands out in the regional record. |
| CoonawarraAustralia | -0.0°C | -3 GDD | +8 mm | No single weather pattern stands out in the regional record. |
| Maipo ValleyChile | -0.0°C | -19 GDD | -87 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Central SicilyItaly | -0.0°C | -5 GDD | +15 mm | No single weather pattern stands out in the regional record. |
| Southeast SpainSpain | -0.1°C | -18 GDD | +74 mm | Repeated hot days can speed ripening and put vines under stress. |
| McLaren ValeAustralia | -0.1°C | -23 GDD | -20 mm | No single weather pattern stands out in the regional record. |
| Margaret River & Great SouthernAustralia | -0.1°C | -30 GDD | +70 mm | Rain close to harvest can raise rot pressure and shorten the picking window. |
| PugliaItaly | -0.1°C | -23 GDD | -21 mm | No single weather pattern stands out in the regional record. |
| Adelaide HillsAustralia | -0.1°C | -38 GDD | -21 mm | No single weather pattern stands out in the regional record. |
| StellenboschSouth Africa | -0.2°C | -45 GDD | -17 mm | No single weather pattern stands out in the regional record. |
| AbruzzoItaly | -0.2°C | -28 GDD | +90 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Heathcote & RutherglenAustralia | -0.2°C | -58 GDD | -19 mm | Frost exposure can vary sharply from one site to the next. |
| Barossa, Eden & Clare ValleysAustralia | -0.2°C | -58 GDD | -49 mm | No single weather pattern stands out in the regional record. |
| Hunter ValleyAustralia | -0.3°C | -84 GDD | +237 mm | Frequent rain can mean more canopy growth and more disease pressure. Rain close to harvest can raise rot pressure and shorten the picking window. |
| Yarra Valley & Mornington PeninsulaAustralia | -0.3°C | -88 GDD | +35 mm | No single weather pattern stands out in the regional record. |
Methods, limitations, and sources
How this comparison is made
Each row uses the region’s configured growing-season window and only appears when its annual summary passes the shared source, regional-rule, baseline, metric, and 95% window-completeness checks. GDD means growing degree days, a measure of accumulated warmth above each region’s published base temperature.
The map colors show mean-temperature departure from 1991–2020. GDD and rain departures use the same baseline. “Last Updated” is the oldest calculation time among the displayed rows; “Data through” is the oldest source date. This conservative rule prevents a partly refreshed atlas from appearing newer than all of its regions.
Limits
These are regional weather summaries, not vineyard measurements. Region outlines represent approximate wine-growing and weather-analysis areas, not official boundaries or individual vineyards. A regional pattern can hide meaningful differences in elevation, exposure, storms, soils, vineyard practice, and harvest timing. The weather record alone does not determine wine quality.
Source
Weather & Vines combined regional series. Combined records use eligible NOAA GHCN observations where available and ERA5 reanalysis for the regional grid and for locations or dates without eligible station coverage.