Vintage weather atlas
1997 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 |
|---|---|---|---|---|
| Hunter ValleyAustralia | +1.0°C | +245 GDD | -177 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. |
| Paso Robles & Santa Barbara CountyUnited States | +0.8°C | +191 GDD | -95 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Napa ValleyUnited States | +0.8°C | +186 GDD | -27 mm | No single weather pattern stands out in the regional record. |
| LodiUnited States | +0.7°C | +164 GDD | -81 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Santa Cruz MountainsUnited States | +0.7°C | +142 GDD | -62 mm | No single weather pattern stands out in the regional record. |
| MarlboroughNew Zealand | +0.6°C | +168 GDD | -196 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Rías BaixasSpain | +0.5°C | +91 GDD | +62 mm | No single weather pattern stands out in the regional record. |
| BordeauxFrance | +0.4°C | +90 GDD | +7 mm | No single weather pattern stands out in the regional record. |
| DouroPortugal | +0.3°C | +39 GDD | +56 mm | No single weather pattern stands out in the regional record. |
| Bierzo & ValdeorrasSpain | +0.2°C | -19 GDD | +202 mm | Frequent rain can mean more canopy growth and more disease pressure. |
| Willamette ValleyUnited States | +0.1°C | +17 GDD | +177 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. Frost exposure can vary sharply from one site to the next. |
| CataloniaSpain | +0.1°C | +27 GDD | -132 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Heathcote & RutherglenAustralia | +0.1°C | +16 GDD | -79 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Jerez & SherrySpain | +0.1°C | +28 GDD | -16 mm | No single weather pattern stands out in the regional record. |
| RiojaSpain | +0.1°C | -2 GDD | +104 mm | Frequent rain can mean more canopy growth and more disease pressure. |
| Castilla y LeónSpain | +0.1°C | -14 GDD | +100 mm | Frequent rain can mean more canopy growth and more disease pressure. |
| Loire ValleyFrance | +0.1°C | +30 GDD | -24 mm | No single weather pattern stands out in the regional record. |
| SardiniaItaly | +0.1°C | +13 GDD | -66 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Margaret River & Great SouthernAustralia | +0.0°C | +1 GDD | +20 mm | No single weather pattern stands out in the regional record. |
| BurgundyFrance | +0.0°C | +11 GDD | -28 mm | Frost exposure can vary sharply from one site to the next. |
| StellenboschSouth Africa | -0.1°C | -15 GDD | -68 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Southeast SpainSpain | -0.1°C | -22 GDD | +48 mm | No single weather pattern stands out in the regional record. |
| PiedmontItaly | -0.1°C | -11 GDD | -234 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Languedoc, Roussillon & ProvenceFrance | -0.1°C | -38 GDD | -137 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Maipo ValleyChile | -0.2°C | -45 GDD | +242 mm | Frequent rain can mean more canopy growth and more disease pressure. Frost exposure can vary sharply from one site to the next. |
| Rhône ValleyFrance | -0.2°C | -46 GDD | -114 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| TasmaniaAustralia | -0.2°C | -51 GDD | -41 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Columbia GorgeUnited States | -0.2°C | -40 GDD | +171 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. A freeze after budbreak can damage new growth and reduce the crop. |
| Yakima & Central Columbia BasinUnited States | -0.3°C | -65 GDD | +22 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Southern OregonUnited States | -0.3°C | -69 GDD | +97 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. A freeze after budbreak can damage new growth and reduce the crop. |
| Walla Walla ValleyUnited States | -0.3°C | -73 GDD | +46 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| Yarra Valley & Mornington PeninsulaAustralia | -0.3°C | -80 GDD | -94 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Po Valley & Northeast ItalyItaly | -0.4°C | -78 GDD | -215 mm | Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. |
| Sonoma & MendocinoUnited States | -0.4°C | -91 GDD | +45 mm | Frost exposure can vary sharply from one site to the next. |
| CoonawarraAustralia | -0.4°C | -110 GDD | +31 mm | No single weather pattern stands out in the regional record. |
| CorsicaFrance | -0.4°C | -65 GDD | -120 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. |
| MoselGermany | -0.4°C | -29 GDD | -1 mm | A freeze after budbreak can damage new growth and reduce the crop. |
| McLaren ValeAustralia | -0.5°C | -113 GDD | +65 mm | No single weather pattern stands out in the regional record. |
| ChampagneFrance | -0.5°C | -52 GDD | -14 mm | Frost exposure can vary sharply from one site to the next. |
| Alsace & JuraFrance | -0.6°C | -68 GDD | -44 mm | Frost exposure can vary sharply from one site to the next. |
| Adelaide HillsAustralia | -0.6°C | -142 GDD | +64 mm | No single weather pattern stands out in the regional record. |
| Barossa, Eden & Clare ValleysAustralia | -0.7°C | -167 GDD | +116 mm | Frequent rain can mean more canopy growth and more disease pressure. |
| TuscanyItaly | -0.7°C | -114 GDD | -62 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. |
| Umbria & MarcheItaly | -0.7°C | -122 GDD | -20 mm | Frost exposure can vary sharply from one site to the next. |
| Trentino–Alto AdigeItaly | -0.7°C | -92 GDD | -113 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. |
| AbruzzoItaly | -0.7°C | -59 GDD | -31 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. |
| Southern ApenninesItaly | -0.8°C | -140 GDD | -31 mm | Rain close to harvest can raise rot pressure and shorten the picking window. |
| PugliaItaly | -0.9°C | -210 GDD | +5 mm | Rain close to harvest can raise rot pressure and shorten the picking window. |
| EtnaItaly | -0.9°C | -149 GDD | +108 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. A freeze after budbreak can damage new growth and reduce the crop. |
| Central SicilyItaly | -1.0°C | -196 GDD | +118 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. Frost exposure can vary sharply from one site to the next. |
| MendozaArgentina | -1.1°C | -273 GDD | +391 mm | Cool weather can slow ripening and help grapes retain acidity. Frequent rain can mean more canopy growth and more disease pressure. Rain close to harvest can raise rot pressure and shorten the picking window. |
| WachauAustria | -1.2°C | -140 GDD | +66 mm | Cool weather can slow ripening and help grapes retain acidity. A freeze after budbreak can damage new growth and reduce the crop. |
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.