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Chile · Multi-region weather view

Colchagua Valley

Central Chilean vineyards from the Paredones coastal area through Pumanque and Santa Cruz toward San Fernando, known for Carménère and Cabernet Sauvignon.

Dry summers and the contrast between Pacific-influenced western vineyards and the warmer interior shape ripening; spring frost and late-harvest rain can change the season.

Climate comparisons use the 1991–2020 combined regional record · updated through Oct 17, 2026.

Current conditions

Model estimate valid Nov 3, 2026 · 06:00 UTC

Regional model estimate averaged across the configured sampling locations.

Temperature11.4°C
Dew Point9.3°C
Relative Humidity87%
24h RainfallUnavailable

Vintage explorer

Compare this vintage · View 2014 across regions →

Moderately warmer and moderately drier than normal.

Mean temperature17.7°C
Temperature anomaly+0.5°Cvs 1991-2020
Growing degree days1859base 10°C
Hot days0≥ 35°C

What stood out in 2014

No single weather pattern stands out in the regional record.

Close to the usual range · Low confidence

Temperature, rainfall, heat, and frost all stayed within the site's published thresholds.

No single weather pattern stands out in the regional record.

How unusual was 2014?

The ranking compares vintages that meet the data-coverage threshold and use the same source, regional rules, and 1991-2020 baseline.

Growing-season temperature

6th warmest of 35 vintages Warmer than 29 of 34 other vintages 17.7°C

Growing-season rainfall

18th wettest of 35 vintages Wetter than 17 of 34 other vintages 154.1 mm

Heat accumulation

6th highest of 35 vintages Higher than 29 of 34 other vintages 1859 GDD

Hot days

3rd most of 35 vintages More than 0 of 34 other vintages 0 days

2014 month by month

Compared with 1991–2020

Follow heat accumulation, rainfall, frost exposure, and the region’s growing and harvest windows in calendar order.

Frost watch Growing season Harvest window
  1. 1–30
    Frost watchGrowing season

    Heat accumulation

    2014 65 GDD
    Typical 66 GDD

    Rainfall

    2014 98.4 mm
    Typical 53.4 mm
    2014 freezing days
    0
    Typical
    0.0

    Wetter than the typical month.

  2. 1–31
    Frost watchGrowing season

    Heat accumulation

    2014 176 GDD
    Typical 135 GDD

    Rainfall

    2014 6.4 mm
    Typical 34.3 mm
    2014 freezing days
    0
    Typical
    0.0

    Heat accumulation ran ahead of the typical month.

  3. 1–30
    Frost watchGrowing season

    Heat accumulation

    2014 200 GDD
    Typical 213 GDD

    Rainfall

    2014 20.0 mm
    Typical 13.7 mm
    2014 freezing days
    0
    Typical
    0.0

    Close to the typical monthly pattern.

  4. 1–31
    Growing season

    Heat accumulation

    2014 261 GDD
    Typical 288 GDD

    Rainfall

    2014 13.1 mm
    Typical 9.5 mm

    Close to the typical monthly pattern.

  5. 1–31
    Growing season

    Heat accumulation

    2014 349 GDD
    Typical 337 GDD

    Rainfall

    2014 0.2 mm
    Typical 5.9 mm

    Close to the typical monthly pattern.

  6. 1–28
    Growing seasonHarvest window

    Heat accumulation

    2014 304 GDD
    Typical 292 GDD

    Rainfall

    2014 1.1 mm
    Typical 4.4 mm

    Close to the typical monthly pattern.

  7. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2014 320 GDD
    Typical 267 GDD

    Rainfall

    2014 4.9 mm
    Typical 9.2 mm

    Close to the typical monthly pattern.

  8. 1–30
    Growing seasonHarvest window

    Heat accumulation

    2014 183 GDD
    Typical 144 GDD

    Rainfall

    2014 9.8 mm
    Typical 35.0 mm

    Heat accumulation ran ahead of the typical month.

View milestone calendar data as a table
Month2014 GDDTypical GDD2014 rainfallTypical rainfall2014 freezing daysTypical freezing days
September 2014 65 GDD 66 GDD 98.4 mm 53.4 mm 00.0
October 2014 176 GDD 135 GDD 6.4 mm 34.3 mm 00.0
November 2014 200 GDD 213 GDD 20.0 mm 13.7 mm 00.0
December 2014 261 GDD 288 GDD 13.1 mm 9.5 mm Outside frost windowOutside frost window
January 2015 349 GDD 337 GDD 0.2 mm 5.9 mm Outside frost windowOutside frost window
February 2015 304 GDD 292 GDD 1.1 mm 4.4 mm Outside frost windowOutside frost window
March 2015 320 GDD 267 GDD 4.9 mm 9.2 mm Outside frost windowOutside frost window
April 2015 183 GDD 144 GDD 9.8 mm 35.0 mm Outside frost windowOutside frost window
Calendar data and method

Monthly values are weighted across every configured regional sample using stored Google ARCO ERA5 daily reanalysis. “Typical” is the mean monthly total across 30 baseline seasons. GDD is counted only inside the configured growing window; freezing days are counted only inside the frost-watch window; rainfall covers every displayed calendar day.

Selected-vintage coverage is 100%. Source rows were last retrieved Oct 17, 2026.

Replay the 2014 growing season

242 daily regional observations

Move through the season to follow temperature, rainfall, accumulated heat, and recorded weather events day by day.

Replay data and method

Daily values are weighted across every configured regional sample using stored Google ARCO ERA5 reanalysis. Coverage is 100%. Source rows were last retrieved Oct 17, 2026.

Closest weather matches

These years had the most similar growing-season and harvest weather.

  1. Closest match

    2018

    Most alike in Hot-day count and Spring frost exposure.

    Hot-day count
    the same: 0 days
    Spring frost exposure
    the same: 0 days

    Largest difference: Growing-season mean temperature — cooler

    View 2018 →

  2. Second closest

    2022

    Most alike in Hot-day count and Spring frost exposure.

    Hot-day count
    the same: 0 days
    Spring frost exposure
    the same: 0 days

    Largest difference: Harvest precipitation — more rain

    View 2022 →

  3. Third closest

    1998

    Most alike in Hot-day count and Spring frost exposure.

    Hot-day count
    the same: 0 days
    Spring frost exposure
    the same: 0 days

    Largest difference: Growing-season precipitation — less rain

    View 1998 →
How similar years are calculated

Method analog-v1-2026-07 standardizes six weather measures across 34 complete ARCO ERA5 comparison years, then measures the distance between them. The calculation runs when the page is requested.

Measures used: Growing-season mean temperature (20%); Growing degree days (15%); Hot-day count (15%); Growing-season precipitation (20%); Harvest precipitation (20%); Spring frost exposure (10%).

Calculated distances: 2018 0.243; 2022 0.540; 1998 0.597.

Growing-season temperature anomalyCompared with 1991-2020
Temperature anomaly by vintage, 1991 to 2025 A line above zero indicates a warmer growing season than the 1991–2020 baseline. Select a point to inspect that vintage. +1.5°C −1.5°C 1991 2000 2010 2020 2025
Growing-season rainfall anomaly
Rainfall anomaly by vintage, 1991 to 2025 Bars show millimeters above or below the 1991–2020 growing-season baseline. Select a bar to inspect that vintage. +230 mm −230 mm 1991 2000 2010 2020 2025
View historical chart data as a table
YearTemperature anomalyRainfall anomalyHot days
1991-0.3°C+114 mm0
1992+0.3°C-10 mm0
1993-0.1°C-7 mm0
1994+0.4°C+9 mm0
1995-0.1°C-58 mm0
1996+0.7°C-55 mm0
1997-0.1°C+223 mm0
1998+0.2°C-81 mm0
1999-0.3°C+85 mm0
2000-0.3°C+120 mm0
2001-0.2°C-64 mm0
2002-0.4°C-20 mm0
2003-0.1°C+83 mm0
2004-0.4°C+25 mm0
2005-0.4°C-23 mm0
2006-0.4°C+9 mm0
2007-0.1°C-67 mm0
2008+0.6°C-124 mm0
2009-0.7°C-32 mm0
2010-0.6°C+18 mm0
2011+0.3°C-98 mm0
2012-0.2°C+29 mm0
2013-0.3°C-100 mm0
2014+0.5°C-11 mm0
2015+0.0°C+209 mm0
2016+1.1°C-41 mm1
2017-0.2°C-2 mm0
2018+0.3°C+5 mm0
2019+1.0°C-93 mm0
2020-0.2°C-44 mm0
2021-0.2°C-33 mm0
2022+0.5°C-52 mm0
2023-0.5°C+79 mm0
2024-0.1°C-53 mm1
2025-0.0°C+21 mm0

winter

9.7°C

+0.1°C vs baseline

323 mm rain · -49 mm

spring

14.8°C

+0.3°C vs baseline

124 mm rain · +23 mm

summer

20.2°C

+0.0°C vs baseline

14 mm rain · -5 mm

harvest

19.1°C

+1.2°C vs baseline

15 mm rain · -33 mm

Weather events

Periods that crossed one of the published regional thresholds, shown in date order.

  1. Dry spell

    Duration
    30 days
    Total rain
    2.0 mm
    Daily cutoff
    1.0 mm/day

  2. Dry spell

    Duration
    93 days
    Total rain
    2.9 mm
    Daily cutoff
    1.0 mm/day

  3. Dry spell

    Duration
    20 days
    Total rain
    0.6 mm
    Daily cutoff
    1.0 mm/day
How events are detected

Weather & Vines combined regional series; method event-timeline-v2-2026-07, rules colchagua-valley-catalog-v1-2026-10. Source last updated Oct 17, 2026, calculated Oct 18, 2026. Each configured point must have at least 95.0% coverage.

1991–present

Climate change

Measured regional trends are shown separately from model projections. The observed record ends at the latest complete growing season shared by every published region.

Compare regions

Observed record

Historical trends, 1991–2025

Growing degree days changed +9.5 GDD per decade. The 95% interval is -21.8 to +40.8 GDD per decade, based on 35 eligible vintages.

How it is measured: Across the September 1–April 30 growing season, each day's mean temperature above 10°C adds to the total; cooler days add zero.

Growing degree days · annual change from the 1991–2020 average1991–2025

Scroll horizontally to inspect the full timeline.

View annual growing degree days data
VintageGrowing degree daysChange from 1991–2020
19911682 GDD-59 GDD
19921821 GDD+80 GDD
19931705 GDD-36 GDD
19941843 GDD+101 GDD
19951721 GDD-20 GDD
19961901 GDD+160 GDD
19971707 GDD-35 GDD
19981781 GDD+40 GDD
19991682 GDD-59 GDD
20001684 GDD-58 GDD
20011708 GDD-34 GDD
20021632 GDD-109 GDD
20031716 GDD-26 GDD
20041655 GDD-86 GDD
20051640 GDD-101 GDD
20061640 GDD-101 GDD
20071715 GDD-27 GDD
20081879 GDD+137 GDD
20091574 GDD-167 GDD
20101587 GDD-154 GDD
20111809 GDD+68 GDD
20121679 GDD-63 GDD
20131674 GDD-67 GDD
20141859 GDD+118 GDD
20151745 GDD+3 GDD
20162004 GDD+263 GDD
20171695 GDD-46 GDD
20181819 GDD+78 GDD
20191988 GDD+247 GDD
20201694 GDD-48 GDD
20211689 GDD-52 GDD
20221870 GDD+128 GDD
20231623 GDD-119 GDD
20241717 GDD-24 GDD
20251734 GDD-8 GDD
Growing-season mean temperature
+0.04 °C per decade 95% interval -0.09 to +0.18
Growing degree days
+9.50 GDD per decade 95% interval -21.83 to +40.82
Growing-season precipitation
-14.48 mm per decade 95% interval -32.95 to +4.00
Hot days
+0.07 days per decade 95% interval +0.00 to +0.13
Spring frost days
-0.01 days per decade 95% interval -0.05 to +0.02
Longest dry spell
+10.42 days per decade 95% interval +3.33 to +17.51

Last Updated October 17, 2026

Model ensemble

Projected climate through 2075

Temperature changes are relative to each model’s 1991–2020 baseline. The table combines all three pathways, weighted 70% to SSP2-4.5 and 15% each to SSP1-2.6 and SSP3-7.0.

Scroll horizontally to compare all columns.

PeriodWeighted medianWeighted central 80%Models per pathway
2021-2040+0.7°C+0.4 to +1.0°C25
2041-2060+1.1°C+0.8 to +1.6°C25
2061-2075+1.5°C+1.1 to +2.3°C25
How pathways are combined

For each period and percentile, Weather & Vines takes 70% of the SSP2-4.5 value, 15% of the SSP1-2.6 value, and 15% of the SSP3-7.0 value. Each pathway contains the same 25 models. The weights are an editorial view of the current trajectory, not scenario probabilities.

Last Updated June 29, 2025

Compare projection measures across regions

Typical year · 1991–2020

When to visit

This calendar describes typical regional weather under the selected climate baseline. It is not a forecast for a future trip, and it does not account for crowds, lodging, events, or vineyard access.

Deterministic IFS forecast

Next ten days

Detailed forecast outlook

Regional average across 4 sampling locations.

ECMWF IFS 0.25° via Herbie · model run Nov 3, 2026 at 00:00 UTC · retrieved Nov 3, 2026 at 08:24 UTC

Scroll horizontally to see all forecast dates.

DateTueWedThuFriSatSunMonTueWedThu
High 19°C 21°C 20°C 20°C 26°C 30°C 20°C 29°C 26°C 24°C
Low 11°C 10°C 9°C 8°C 9°C 12°C 14°C 12°C 15°C 13°C
Rain 2.5 mm 0.0 mm 0.0 mm 0.1 mm 0.0 mm 0.0 mm 1.4 mm 0.0 mm 0.0 mm 0.0 mm

Across the typical year: Late January has the warmest median afternoon high (27.8°C); Late June has the coolest (13.5°C). Wet days are most frequent in Early June (35%) and least frequent in Early January (2%). Ties are resolved by calendar order.

Typical afternoon highs and overnight lowsMedians and middle 50% of daily readings

Afternoon highOvernight lowMiddle 50%

Scroll horizontally to inspect all 24 half-month periods.

Typical afternoon highs and overnight lows for Colchagua Valley Median daily maximum and minimum temperatures for 24 early and late-month periods under the 1991–2020 baseline. Neutral bands show the 25th to 75th percentile. 0°C5°C10°C15°C20°C25°C30°C JanFebMarAprMayJunJulAugSepOctNovDec
How often a day is wetShare of days with at least 1 mm of rain

Scroll horizontally to inspect all 24 half-month periods.

Wet-day frequency through the typical year for Colchagua Valley The fraction of days receiving at least one millimeter of rain in each early and late-month period under the 1991–2020 baseline. 0%25%50%75%100% JanFebMarAprMayJunJulAugSepOctNovDec
View all 24 periods as a table

Scroll horizontally to view all columns.

Colchagua Valley typical weather by half-month, 1991–2020
PeriodAfternoon high, median (middle 50%)Overnight low, median (middle 50%)Wet-day frequencyPeriod rain, median (middle 50%)
Jan 1–1527.8°C (26.5–29.2°C)13.8°C (12.7–14.8°C)2%0.4 mm (0.1–1.5 mm)
Jan 16–3127.8°C (26.5–29.3°C)14.2°C (13.2–15.1°C)2%0.4 mm (0.3–1.9 mm)
Feb 1–1527.5°C (26.1–29.0°C)13.8°C (12.7–14.6°C)2%0.3 mm (0.1–0.8 mm)
Feb 16–2926.9°C (25.3–28.3°C)13.5°C (12.5–14.5°C)3%0.5 mm (0.1–2.3 mm)
Mar 1–1526.3°C (24.6–28.0°C)12.7°C (11.5–13.7°C)4%0.4 mm (0.2–5.1 mm)
Mar 16–3124.8°C (23.1–26.2°C)11.3°C (10.2–12.5°C)6%0.6 mm (0.1–5.3 mm)
Apr 1–1522.0°C (19.9–24.1°C)9.7°C (8.2–11.0°C)11%10.7 mm (1.1–18.6 mm)
Apr 16–3019.5°C (17.8–21.6°C)8.0°C (6.5–9.8°C)14%10.4 mm (5.1–33.0 mm)
May 1–1518.0°C (16.3–19.5°C)7.4°C (5.8–9.4°C)18%12.2 mm (1.5–48.8 mm)
May 16–3115.5°C (14.0–17.1°C)6.4°C (4.3–8.4°C)30%50.1 mm (23.7–123.8 mm)
Jun 1–1514.4°C (13.0–16.0°C)5.5°C (3.3–7.8°C)35%74.3 mm (32.8–136.0 mm)
Jun 16–3013.5°C (12.1–14.8°C)4.8°C (2.5–7.4°C)34%69.7 mm (17.2–125.7 mm)
Jul 1–1513.6°C (12.0–15.1°C)4.4°C (2.2–6.6°C)30%56.7 mm (35.0–75.8 mm)
Jul 16–3113.6°C (12.2–15.2°C)3.8°C (1.5–5.9°C)29%34.7 mm (9.6–76.7 mm)
Aug 1–1514.3°C (12.9–16.3°C)4.5°C (2.3–6.5°C)29%36.9 mm (13.1–74.4 mm)
Aug 16–3115.5°C (14.0–17.6°C)5.7°C (3.4–7.7°C)24%27.3 mm (10.4–58.3 mm)
Sep 1–1516.5°C (14.7–18.9°C)6.2°C (4.3–7.8°C)24%21.1 mm (5.9–33.9 mm)
Sep 16–3018.1°C (16.1–20.2°C)7.2°C (5.6–8.5°C)20%14.7 mm (6.4–29.7 mm)
Oct 1–1519.2°C (17.0–21.3°C)8.1°C (6.5–9.3°C)22%12.9 mm (6.0–27.1 mm)
Oct 16–3121.3°C (19.3–23.6°C)8.7°C (7.3–10.3°C)12%7.4 mm (2.4–16.0 mm)
Nov 1–1522.9°C (20.8–25.1°C)10.1°C (8.7–11.2°C)10%4.3 mm (1.5–11.9 mm)
Nov 16–3024.8°C (22.8–26.7°C)10.9°C (9.8–12.1°C)7%2.5 mm (0.8–7.7 mm)
Dec 1–1525.8°C (23.7–27.4°C)12.0°C (10.7–13.1°C)5%2.2 mm (0.6–5.3 mm)
Dec 16–3127.1°C (25.3–28.6°C)13.0°C (12.0–14.0°C)4%0.5 mm (0.2–2.5 mm)

Each year contributes to temperature or rain separately when at least 90% of that period’s days are present. A value is shown only when at least 80% of the baseline years qualify. February 29 is included in late February.

Historical climatology Last Updated October 17, 2026

Season to date

Growing season heat and rainfall

Sep 1–Nov 2, 2026

Compare this season across regions →

Growing degree days230.2base 10°C
Growing-season rainfall214.5 mmweighted regional total
Cumulative growing degree daysBase 10°C

2026 season1991–2020 average

Growing degree days accumulated during the 2026 growing season The solid line accumulates daily mean temperature above 10 degrees Celsius from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 230 GDD 0 Sep ’26OctNov
Cumulative growing-season rainfallRegional weighted mean

2026 season1991–2020 average

Rainfall accumulated during the 2026 growing season The solid line accumulates daily rainfall in millimeters from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 214 mm 0 Sep ’26OctNov
View growing-season accumulation data
DateSeason GDD1991–2020 average GDDSeason rainfall1991–2020 average rainfall
2026-09-013.91.40.0 mm2.2 mm
2026-09-027.72.60.3 mm4.2 mm
2026-09-0310.34.20.4 mm6.5 mm
2026-09-0410.86.10.4 mm9.6 mm
2026-09-0511.87.90.4 mm13.3 mm
2026-09-0613.49.50.4 mm17.5 mm
2026-09-0713.811.10.4 mm19.6 mm
2026-09-0813.812.90.5 mm21.6 mm
2026-09-0915.314.60.5 mm24.8 mm
2026-09-1017.216.21.9 mm28.3 mm
2026-09-1119.018.05.7 mm29.4 mm
2026-09-1221.419.75.7 mm31.5 mm
2026-09-1323.521.55.7 mm32.4 mm
2026-09-1428.223.55.8 mm32.9 mm
2026-09-1533.825.65.8 mm33.9 mm
2026-09-1639.328.15.8 mm37.5 mm
2026-09-1745.330.35.8 mm39.5 mm
2026-09-1852.632.59.0 mm41.4 mm
2026-09-1955.734.813.8 mm42.4 mm
2026-09-2058.137.536.3 mm43.2 mm
2026-09-2160.540.336.4 mm43.9 mm
2026-09-2264.842.836.4 mm44.8 mm
2026-09-2368.845.536.4 mm46.1 mm
2026-09-2472.348.239.5 mm46.9 mm
2026-09-2577.751.140.3 mm47.6 mm
2026-09-2684.053.940.4 mm48.7 mm
2026-09-2790.456.840.5 mm50.3 mm
2026-09-2895.059.845.1 mm51.1 mm
2026-09-2996.863.045.1 mm51.8 mm
2026-09-3099.465.650.1 mm53.4 mm
2026-10-01104.268.550.6 mm55.2 mm
2026-10-02108.171.458.9 mm56.3 mm
2026-10-03111.474.459.4 mm57.4 mm
2026-10-04113.077.360.0 mm60.3 mm
2026-10-05114.180.663.0 mm61.9 mm
2026-10-06115.884.3116.2 mm63.6 mm
2026-10-07120.088.1121.8 mm64.6 mm
2026-10-08123.591.9134.3 mm65.4 mm
2026-10-09127.096.1135.9 mm65.8 mm
2026-10-10130.999.9135.9 mm67.1 mm
2026-10-11136.4103.6142.4 mm68.5 mm
2026-10-12139.8107.7146.9 mm69.3 mm
2026-10-13143.9112.0150.6 mm72.2 mm
2026-10-14148.7116.0150.8 mm75.4 mm
2026-10-15154.4120.1150.9 mm77.3 mm
2026-10-16159.8124.0151.1 mm78.8 mm
2026-10-17166.2128.2151.2 mm78.9 mm
2026-10-18171.9132.7152.5 mm79.2 mm
2026-10-19180.5137.0153.9 mm80.0 mm
2026-10-20186.4141.9171.2 mm80.5 mm
2026-10-21193.3146.8183.8 mm80.8 mm
2026-10-22199.9152.0195.6 mm81.3 mm
2026-10-23205.1157.1201.5 mm81.9 mm
2026-10-24209.7161.9204.3 mm82.5 mm
2026-10-25216.3167.2204.3 mm83.2 mm
2026-10-26223.3172.9214.5 mm83.6 mm
2026-10-27230.2178.7214.5 mm84.0 mm

Forecast outlook

ECMWF IFS 0.25° via Herbie · run Nov 3, 2026 at 00:00 UTC

Regional average across 4 sampling locations. Daily highs and lows are averages of the locations’ daily highs and lows.

10-day totals compared with the 1991–2020 combined regional record

GDD accumulation
67 GDDvs 65 GDD average
Total rainfall
4.0 mmvs 6.3 mm average

No unusually hot or wet period stands out in the short-range forecast.

Tue11/3 19°Cavg 23°C 11°Cavg 10°C +5 GDD 2.5 mm
Wed11/4 21°Cavg 22°C 10°Cavg 9°C +5 GDD 0.0 mm
Thu11/5 20°Cavg 23°C 9°Cavg 9°C +4 GDD 0.0 mm
Fri11/6 20°Cavg 23°C 8°Cavg 10°C +4 GDD 0.1 mm
Sat11/7 26°Cavg 23°C 9°Cavg 10°C +7 GDD 0.0 mm
Sun11/8 30°Cavg 22°C 12°Cavg 10°C +10 GDD 0.0 mm
Mon11/9 20°Cavg 23°C 14°Cavg 10°C +7 GDD 1.4 mm
Tue11/10 29°Cavg 24°C 12°Cavg 10°C +9 GDD 0.0 mm
Wed11/11 26°Cavg 24°C 15°Cavg 10°C +10 GDD 0.0 mm
Thu11/12 24°Cavg 23°C 13°Cavg 11°C +7 GDD 0.0 mm

Data and methods

Show data sources and model assumptions

Current model conditions and the 10-day outlook use the 00 UTC deterministic ECMWF IFS 0.25° public forecast retrieved directly with Herbie. Historical temperature and rain combine qualifying GHCN-D stations with ERA5 by geographic area; a missing station day uses the nearest ERA5 value for that station's area. Climate comparisons use 1991–2020.

Forecast comparisons use the 1991–2020 combined regional daily record. Daily high and low averages use the matching date; rainfall and GDD sum the same calendar dates as the forecast period.

This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Weather & Vines subsets, converts, and regionally weights the forecast fields. ECMWF data are published under CC BY 4.0. ECMWF accepts no liability for errors, omissions, availability, loss, or damage arising from their use.

Climate projections use NASA NEX-GDDP-CMIP6 v2.0, accessed November 2, 2026, with 25 models. Weather & Vines subsets and aggregates the source fields. Source files and derived projection data are under CC BY-SA 4.0; the full roster and limitations are listed in the climate atlas methods.

The Colchagua Valley model uses a September 1–April 30 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.