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United States. Growing season April–October, harvest usually September–October. 26 vintages of weather, 2000–2025.
Photo: David Burn, CC BY-SA 2.0, via Wikimedia Commons
Over the 30 growing seasons from 1991 to 2020, Willamette Valley's vines saw on average 1,230 growing degree days between April and October. That puts it in Winkler region I, close in heat and rain to Champagne, Rheingau and Marlborough. In a typical year about 302 mm of rain falls in the growing season, 119 mm of it in September–October.
Since 2000 the warmest season was 2015 (+25% against normal) and the coolest 2010 (-16%). The wettest harvest window was 2016, with 311 mm against a normal 119 mm.
The last 10 vintages (2016–2025) averaged +13% against the 1991–2020 normal, compared with -3% for 2000–2009; 9 of those 10 seasons were warmer than normal by more than 3%.
Growing degree days (base 10°C) for each season. The dashed line is the 1991–2020 normal (1,230 GDD) and the shaded band one standard deviation either side: about two years in three fall inside it.
Full bar: rain over the whole growing season. Dark part: rain in the harvest window (September–October). The line is the normal season total, 302 mm.
Apr–Oct 2025
Much warmer
Hot months: Apr +2.4° Jun +2.2°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 7 of 26 for heat · Winkler II
Apr–Oct 2024
Much warmer
Hot months: Jul +3.2°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 9 of 26 for heat · Winkler I
Apr–Oct 2023
Much warmer
Hot months: May +3.7° Jun +3.0° Jul +2.2° Aug +2.5°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 3 of 26 for heat · Winkler II
Apr–Oct 2022
Much warmer
Hot months: Aug +2.9° Oct +4.5°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 5 of 26 for heat · Winkler II
Apr–Oct 2021
Much warmer
Hot months: Apr +3.4° Jun +5.3°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 4 of 26 for heat · Winkler II
Apr–Oct 2020
Much warmer
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 10 of 26 for heat · Winkler I
Apr–Oct 2019
Near normal
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 18 of 26 for heat · Winkler I
Apr–Oct 2018
Much warmer
Hot months: May +2.2° Jul +2.7°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 8 of 26 for heat · Winkler I
Apr–Oct 2017
Much warmer
Hot months: Aug +2.6°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 12 of 26 for heat · Winkler I
Apr–Oct 2016
Much warmer
Hot months: Apr +4.4° May +2.7° Jun +2.7°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 6 of 26 for heat · Winkler II
Apr–Oct 2015
Much warmer
Hot months: Jun +5.5° Jul +2.7° Oct +3.1°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 1 of 26 for heat · Winkler II
Apr–Oct 2014
Much warmer
Hot months: Sep +2.1° Oct +2.7°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 2 of 26 for heat · Winkler II
Apr–Oct 2013
Near normal
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 16 of 26 for heat · Winkler I
Apr–Oct 2012
Near normal
Hot months: Sep +2.1°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 17 of 26 for heat · Winkler I
Apr–Oct 2011
Much cooler
Hot months: Sep +2.4°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 24 of 26 for heat · Winkler I
Apr–Oct 2010
Much cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 26 of 26 for heat · Winkler I
Apr–Oct 2009
Warmer
Hot months: Jul +2.7°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 15 of 26 for heat · Winkler I
Apr–Oct 2008
Cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 20 of 26 for heat · Winkler I
Apr–Oct 2007
Much cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 22 of 26 for heat · Winkler I
Apr–Oct 2006
Warmer
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 14 of 26 for heat · Winkler I
Apr–Oct 2005
Cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 19 of 26 for heat · Winkler I
Apr–Oct 2004
Much warmer
Hot months: Apr +2.8°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 11 of 26 for heat · Winkler I
Apr–Oct 2003
Warmer
Hot months: Jun +2.3°
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 13 of 26 for heat · Winkler I
Apr–Oct 2002
Much cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 21 of 26 for heat · Winkler I
Apr–Oct 2001
Much cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 25 of 26 for heat · Winkler I
Apr–Oct 2000
Much cooler
No month ran 2°C above its normal high
Bars: mean daily high each month (red = 2°C or more above normal, blue = that much below). Line: the 1991–2020 normal.
Rank 23 of 26 for heat · Winkler I
| Vintage | GDD | vs normal | Season rain | Harvest rain | Hottest month (mean high) |
|---|---|---|---|---|---|
| 2025 | 1,410 | +15% | 201 mm | 111 mm | August 29.5°C |
| 2024 | 1,380 | +12% | 270 mm | 101 mm | July 30.8°C |
| 2023 | 1,490 | +21% | 304 mm | 128 mm | August 30.7°C |
| 2022 | 1,420 | +16% | 344 mm | 60 mm | August 31.1°C |
| 2021 | 1,470 | +20% | 228 mm | 144 mm | July 29.2°C |
| 2020 | 1,340 | +9% | 270 mm | 97 mm | August 28.5°C |
| 2019 | 1,220 | -0% | 312 mm | 145 mm | August 28.4°C |
| 2018 | 1,380 | +13% | 253 mm | 104 mm | July 30.3°C |
| 2017 | 1,330 | +9% | 356 mm | 154 mm | August 30.8°C |
| 2016 | 1,420 | +16% | 419 mm | 311 mm | August 29.9°C |
| 2015 | 1,540 | +25% | 182 mm | 87 mm | July 30.3°C |
| 2014 | 1,510 | +24% | 400 mm | 178 mm | August 30.0°C |
| 2013 | 1,260 | +3% | 350 mm | 159 mm | July 28.5°C |
| 2012 | 1,220 | -0% | 356 mm | 154 mm | August 29.3°C |
| 2011 | 1,070 | -12% | 320 mm | 86 mm | August 28.0°C |
| 2010 | 1,030 | -16% | 448 mm | 175 mm | August 27.2°C |
| 2009 | 1,280 | +4% | 268 mm | 118 mm | July 30.3°C |
| 2008 | 1,140 | -7% | 211 mm | 62 mm | July 27.7°C |
| 2007 | 1,090 | -11% | 273 mm | 127 mm | July 27.4°C |
| 2006 | 1,310 | +7% | 185 mm | 34 mm | July 29.1°C |
| 2005 | 1,190 | -3% | 347 mm | 117 mm | August 29.6°C |
| 2004 | 1,330 | +9% | 334 mm | 145 mm | July 28.9°C |
| 2003 | 1,320 | +7% | 232 mm | 75 mm | July 28.9°C |
| 2002 | 1,110 | -9% | 190 mm | 40 mm | July 27.9°C |
| 2001 | 1,040 | -15% | 283 mm | 76 mm | August 26.9°C |
| 2000 | 1,080 | -12% | 246 mm | 88 mm | August 26.3°C |
| 1991–2020 | 1,230 | ±11% (1 SD) | 302 mm | 119 mm |
The closest matches on this site by normal heat and season rain. Similar weather is one ingredient; soils, slopes and grapes differ.
