Argentina · Multi-region weather view

Mendoza

Name: Mendoza 2015 vintage weather
Creator: Weather & Vines

Mendoza's principal wine areas, from Luján de Cuyo and Maipú south through the Uco Valley and east toward San Martín and Santa Rosa.

The Andes rain shadow makes the season dry, but elevation separates cooler Uco Valley sites from the warmer eastern plain. Spring frost, hail, summer heat and the timing of scarce rain are the main weather signals.

Climate comparisons use the 1991–2020 combined regional record · updated through Sep 13, 2026.

Current conditions

Observations through Sep 21, 2026 · 03:00 UTC

Temperature15.4°C

Dew Point-4.6°C

Relative Humidity25%

24h Rainfall1.0 mmmodeled IFS total through Sep 20

Vintage explorer

Compare this vintage · View 2015 across regions →

Moderately cooler and significantly wetter than normal.

Mean temperature15.1°C

Temperature anomaly-1.2°Cvs 1991-2020

Growing degree days1363base 10°C

Hot days0≥ 35°C

What stood out in 2015

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.

Cooler growing season · High confidence

Mean growing-season temperature was -1.2°C versus the 1991–2020 baseline.

Cool weather can slow ripening and help grapes retain acidity.

Wetter than baseline · Moderate confidence

Growing-season precipitation was 432 mm above the 1991–2020 baseline.

Frequent rain can mean more canopy growth and more disease pressure.

More harvest rain than usual · High confidence

Harvest-window precipitation totaled 439 mm, +103 mm versus baseline.

Rain close to harvest can raise rot pressure and shorten the picking window.

Spring frost recorded · Low confidence

The regional record had 2 spring day(s) at or below 0°C.

Frost exposure can vary sharply from one site to the next.

How unusual was 2015?

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

Growing-season temperature

Coolest of 35 vintages Cooler than every other vintage 15.1°C

Growing-season rainfall

Wettest of 35 vintages Wetter than every other vintage 1130.7 mm

Heat accumulation

2nd lowest of 35 vintages Lower than 33 of 34 other vintages 1363 GDD

Hot days

5th most of 35 vintages More than 0 of 34 other vintages 0 days

2015 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

Sep ’15 1–30

Frost watchGrowing season

Heat accumulation

2015 30 GDD

Typical 43 GDD

Rainfall

2015 52.1 mm

Typical 50.4 mm

2015 freezing days
2

Typical
3.9

Close to the typical monthly pattern.
Oct ’15 1–31

Frost watchGrowing season

Heat accumulation

2015 43 GDD

Typical 121 GDD

Rainfall

2015 160.7 mm

Typical 72.8 mm

2015 freezing days
0

Typical
0.3

Heat accumulation ran behind the typical month.
Nov ’15 1–30

Frost watchGrowing season

Heat accumulation

2015 131 GDD

Typical 209 GDD

Rainfall

2015 138.6 mm

Typical 86.2 mm

2015 freezing days
0

Typical
0.0

Heat accumulation ran behind the typical month.
Dec ’15 1–31

Growing season

Heat accumulation

2015 286 GDD

Typical 299 GDD

Rainfall

2015 134.6 mm

Typical 103.1 mm

Close to the typical monthly pattern.
Jan ’16 1–31

Growing seasonHarvest window

Heat accumulation

2015 304 GDD

Typical 338 GDD

Rainfall

2015 302.7 mm

Typical 112.3 mm

Wetter than the typical month.
Feb ’16 1–29

Growing seasonHarvest window

Heat accumulation

2015 304 GDD

Typical 268 GDD

Rainfall

2015 99.1 mm

Typical 101.9 mm

Close to the typical monthly pattern.
Mar ’16 1–31

Growing seasonHarvest window

Heat accumulation

2015 201 GDD

Typical 224 GDD

Rainfall

2015 102.5 mm

Typical 103.6 mm

Close to the typical monthly pattern.
Apr ’16 1–30

Growing seasonHarvest window

Heat accumulation

2015 65 GDD

Typical 97 GDD

Rainfall

2015 140.4 mm

Typical 68.0 mm

Heat accumulation ran behind the typical month.

View milestone calendar data as a table

Month	2015 GDD	Typical GDD	2015 rainfall	Typical rainfall	2015 freezing days	Typical freezing days
September 2015	30 GDD	43 GDD	52.1 mm	50.4 mm	2	3.9
October 2015	43 GDD	121 GDD	160.7 mm	72.8 mm	0	0.3
November 2015	131 GDD	209 GDD	138.6 mm	86.2 mm	0	0.0
December 2015	286 GDD	299 GDD	134.6 mm	103.1 mm	Outside frost window	Outside frost window
January 2016	304 GDD	338 GDD	302.7 mm	112.3 mm	Outside frost window	Outside frost window
February 2016	304 GDD	268 GDD	99.1 mm	101.9 mm	Outside frost window	Outside frost window
March 2016	201 GDD	224 GDD	102.5 mm	103.6 mm	Outside frost window	Outside frost window
April 2016	65 GDD	97 GDD	140.4 mm	68.0 mm	Outside frost window	Outside 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 Sep 13, 2026.

Replay the 2015 growing season

243 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 Sep 12, 2026.

The daily weather replay is complete, but the separate weather-event scan is not currently available for this vintage.

Closest weather matches

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

Closest match
1999

Most alike in Hot-day count and Harvest precipitation.

Hot-day count
the same: 0 days
Harvest precipitation
less rain: 12.4 mm

Largest difference: Growing-season precipitation — less rain
View 1999 →
Second closest
1997

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 1997 →
Third closest
1991

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

Hot-day count
the same: 0 days
Spring frost exposure
more frost-exposure days: 2 days

Largest difference: Harvest precipitation — less rain
View 1991 →

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: 1999 0.391; 1997 0.610; 1991 0.769.

Growing-season temperature anomalyCompared with 1991-2020

Growing-season rainfall anomaly

View historical chart data as a table

Year	Temperature anomaly	Rainfall anomaly	Hot days
1991	-0.6°C	+274 mm	0
1992	-0.6°C	+245 mm	0
1993	-0.6°C	+17 mm	0
1994	+0.3°C	+2 mm	0
1995	-0.2°C	+9 mm	0
1996	+0.2°C	+72 mm	0
1997	-1.1°C	+391 mm	0
1998	-0.6°C	+73 mm	0
1999	-0.8°C	+328 mm	0
2000	-0.4°C	+23 mm	0
2001	-0.8°C	+154 mm	0
2002	+0.2°C	-41 mm	1
2003	+0.8°C	-148 mm	0
2004	-0.7°C	+21 mm	0
2005	+0.0°C	-181 mm	1
2006	+0.1°C	+3 mm	0
2007	+0.1°C	-107 mm	0
2008	+0.9°C	-201 mm	0
2009	+0.2°C	-181 mm	0
2010	-0.2°C	-123 mm	0
2011	+0.9°C	-216 mm	0
2012	+0.3°C	-93 mm	0
2013	-0.1°C	-99 mm	0
2014	+0.8°C	+20 mm	0
2015	-1.2°C	+432 mm	0
2016	+0.7°C	-49 mm	0
2017	+0.7°C	-202 mm	0
2018	+0.3°C	-99 mm	0
2019	+1.2°C	-180 mm	0
2020	+0.4°C	-143 mm	0
2021	+0.4°C	-178 mm	0
2022	+1.1°C	-247 mm	0
2023	+1.1°C	-60 mm	1
2024	+1.5°C	-209 mm	2
2025	+0.6°C	-34 mm	0
2026	-9.7°C	-672 mm	0

winter

7.4°C

+1.7°C vs baseline

122 mm rain · +2 mm

spring

11.4°C

-2.1°C vs baseline

351 mm rain · +142 mm

summer

19.8°C

-0.2°C vs baseline

536 mm rain · +219 mm

harvest

16.6°C

-0.5°C vs baseline

438 mm rain · +103 mm

Weather events

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 +95.3 GDD per decade. The 95% interval is +66.6 to +124.0 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

Vintage	Growing degree days	Change from 1991–2020
1991	1459 GDD	-140 GDD
1992	1473 GDD	-126 GDD
1993	1492 GDD	-108 GDD
1994	1632 GDD	+33 GDD
1995	1543 GDD	-56 GDD
1996	1637 GDD	+37 GDD
1997	1326 GDD	-273 GDD
1998	1487 GDD	-112 GDD
1999	1391 GDD	-209 GDD
2000	1562 GDD	-37 GDD
2001	1415 GDD	-184 GDD
2002	1622 GDD	+23 GDD
2003	1779 GDD	+180 GDD
2004	1447 GDD	-152 GDD
2005	1660 GDD	+60 GDD
2006	1590 GDD	-9 GDD
2007	1612 GDD	+13 GDD
2008	1807 GDD	+208 GDD
2009	1680 GDD	+81 GDD
2010	1522 GDD	-77 GDD
2011	1812 GDD	+213 GDD
2012	1634 GDD	+35 GDD
2013	1630 GDD	+31 GDD
2014	1750 GDD	+151 GDD
2015	1363 GDD	-236 GDD
2016	1749 GDD	+150 GDD
2017	1741 GDD	+142 GDD
2018	1605 GDD	+6 GDD
2019	1899 GDD	+300 GDD
2020	1657 GDD	+58 GDD
2021	1653 GDD	+53 GDD
2022	1835 GDD	+236 GDD
2023	1837 GDD	+238 GDD
2024	1902 GDD	+303 GDD
2025	1726 GDD	+127 GDD

Growing-season mean temperature: +0.44 °C per decade 95% interval +0.31 to +0.58
Growing degree days: +95.31 GDD per decade 95% interval +66.57 to +124.05
Growing-season precipitation: -94.74 mm per decade 95% interval -137.51 to -51.97
Hot days: +0.11 days per decade 95% interval -0.07 to +0.28
Spring frost days: -0.50 days per decade 95% interval -1.03 to +0.03
Longest dry spell: +1.10 days per decade 95% interval -0.15 to +2.36

Last Updated September 13, 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.

Period	Weighted median	Weighted central 80%	Models per pathway
2021-2040	+0.7°C	+0.5 to +1.1°C	25
2041-2060	+1.3°C	+0.9 to +1.8°C	25
2061-2075	+1.6°C	+1.2 to +2.4°C	25

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

ECMWF IFS 0.25° via Herbie · model run Sep 20, 2026 at 00:00 UTC · retrieved Sep 21, 2026 at 03:20 UTC

Scroll horizontally to see all forecast dates.

Date	MonSep 21	TueSep 22	WedSep 23	ThuSep 24	FriSep 25	SatSep 26	SunSep 27	MonSep 28	TueSep 29
High	17°C	18°C	25°C	28°C	25°C	30°C	24°C	15°C	12°C
Low	11°C	5°C	8°C	14°C	15°C	13°C	17°C	11°C	8°C
Rain	0.0 mm	0.0 mm	0.0 mm	0.2 mm	0.0 mm	0.0 mm	0.0 mm	0.2 mm	6.2 mm

Across the typical year: Late December has the warmest median afternoon high (27.3°C); Early July has the coolest (10.4°C). Wet days are most frequent in Late January (72%) and least frequent in Early June (26%). 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.

How often a day is wetShare of days with at least 1 mm of rain

Scroll horizontally to inspect all 24 half-month periods.

View all 24 periods as a table

Scroll horizontally to view all columns.

Mendoza typical weather by half-month, 1991–2020
Period	Afternoon high, median (middle 50%)	Overnight low, median (middle 50%)	Wet-day frequency	Period rain, median (middle 50%)
Jan 1–15	26.9°C (24.8–29.1°C)	15.3°C (13.6–16.7°C)	71%	45.7 mm (32.8–66.9 mm)
Jan 16–31	26.8°C (24.6–28.9°C)	15.1°C (13.6–16.6°C)	72%	60.0 mm (42.3–73.6 mm)
Feb 1–15	26.0°C (23.3–27.7°C)	14.4°C (12.9–15.9°C)	72%	53.0 mm (32.0–75.9 mm)
Feb 16–29	25.5°C (22.5–27.9°C)	13.7°C (11.7–15.5°C)	66%	42.8 mm (19.3–56.7 mm)
Mar 1–15	23.8°C (21.5–26.5°C)	13.1°C (11.3–14.5°C)	64%	52.8 mm (39.7–71.8 mm)
Mar 16–31	22.2°C (18.9–24.5°C)	10.7°C (9.0–12.8°C)	55%	48.7 mm (23.5–61.8 mm)
Apr 1–15	19.7°C (16.5–22.0°C)	8.7°C (6.6–10.4°C)	48%	38.5 mm (20.7–58.6 mm)
Apr 16–30	17.9°C (15.0–20.3°C)	6.6°C (4.2–8.4°C)	34%	24.6 mm (13.8–35.6 mm)
May 1–15	16.0°C (13.1–18.3°C)	5.1°C (3.5–6.8°C)	33%	19.2 mm (9.3–34.4 mm)
May 16–31	12.9°C (10.0–15.4°C)	2.5°C (0.7–4.5°C)	36%	24.8 mm (16.8–31.6 mm)
Jun 1–15	12.1°C (9.1–14.2°C)	1.0°C (-1.1–2.7°C)	26%	18.1 mm (9.1–30.0 mm)
Jun 16–30	10.7°C (8.0–12.9°C)	0.0°C (-2.1–1.8°C)	29%	17.5 mm (9.3–24.5 mm)
Jul 1–15	10.4°C (7.3–13.1°C)	-0.4°C (-2.6–1.3°C)	26%	16.2 mm (8.4–25.1 mm)
Jul 16–31	10.4°C (7.9–13.0°C)	-0.9°C (-3.1–1.2°C)	26%	12.7 mm (8.8–24.0 mm)
Aug 1–15	12.3°C (9.0–15.0°C)	0.2°C (-2.0–2.2°C)	26%	15.9 mm (10.3–24.0 mm)
Aug 16–31	14.4°C (10.5–17.6°C)	2.0°C (-0.3–3.9°C)	28%	17.4 mm (11.3–28.7 mm)
Sep 1–15	15.2°C (11.6–17.9°C)	3.1°C (1.0–5.2°C)	36%	24.3 mm (16.4–32.1 mm)
Sep 16–30	17.4°C (14.1–20.5°C)	5.0°C (2.8–7.0°C)	31%	20.7 mm (11.6–34.3 mm)
Oct 1–15	19.0°C (15.8–21.9°C)	6.6°C (4.5–8.6°C)	41%	29.6 mm (20.3–52.9 mm)
Oct 16–31	21.2°C (17.9–23.8°C)	8.4°C (6.6–10.2°C)	43%	34.2 mm (14.4–44.3 mm)
Nov 1–15	23.1°C (19.6–25.9°C)	10.1°C (8.2–11.7°C)	48%	33.8 mm (18.5–51.6 mm)
Nov 16–30	24.4°C (21.7–27.0°C)	11.1°C (9.5–13.1°C)	54%	44.5 mm (25.0–56.1 mm)
Dec 1–15	25.2°C (22.6–27.4°C)	12.3°C (10.6–13.8°C)	62%	39.7 mm (30.4–66.3 mm)
Dec 16–31	27.3°C (24.9–29.4°C)	14.7°C (12.7–16.2°C)	61%	35.4 mm (24.1–62.1 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 September 12, 2026

Season to date

Growing season heat and rainfall

Sep 1–Sep 20, 2026

Compare this season across regions →

Growing degree days4.3base 10°C

Growing-season rainfall25.9 mmweighted regional total

Cumulative growing degree daysBase 10°C

2026 season1991–2020 average

Cumulative growing-season rainfallRegional weighted mean

2026 season1991–2020 average

View growing-season accumulation data

Date	Season GDD	1991–2020 average GDD	Season rainfall	1991–2020 average rainfall
2026-09-01	0.5	0.6	0.0 mm	1.6 mm
2026-09-02	4.3	0.9	0.7 mm	2.6 mm
2026-09-03	4.3	1.5	3.8 mm	3.9 mm
2026-09-04	4.3	2.5	4.3 mm	5.3 mm
2026-09-05	4.3	3.6	7.0 mm	8.1 mm
2026-09-06	4.3	4.6	7.2 mm	10.3 mm
2026-09-07	4.3	5.5	7.2 mm	12.3 mm
2026-09-08	4.3	6.4	7.2 mm	14.5 mm
2026-09-09	4.3	7.4	8.1 mm	17.5 mm
2026-09-10	4.3	8.7	8.6 mm	19.1 mm
2026-09-11	4.3	9.6	18.4 mm	20.3 mm
2026-09-12	4.3	10.8	25.9 mm	21.8 mm
2026-09-13	4.3	11.5	25.9 mm	23.4 mm

Forecast outlook

ECMWF IFS 0.25° via Herbie · run Sep 20, 2026 at 00:00 UTC

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

GDD accumulation: 54 GDDvs 19 GDD average
Total rainfall: 6.6 mmvs 16.6 mm average

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

Mon9/21 17°Cavg 18°C 11°Cavg 5°C +4 GDD 0.0 mm

Tue9/22 18°Cavg 17°C 5°Cavg 5°C +1 GDD 0.0 mm

Wed9/23 25°Cavg 16°C 8°Cavg 5°C +6 GDD 0.0 mm

Thu9/24 28°Cavg 17°C 14°Cavg 4°C +10 GDD 0.2 mm

Fri9/25 25°Cavg 18°C 15°Cavg 5°C +10 GDD 0.0 mm

Sat9/26 30°Cavg 17°C 13°Cavg 5°C +10 GDD 0.0 mm

Sun9/27 24°Cavg 17°C 17°Cavg 5°C +10 GDD 0.0 mm

Mon9/28 15°Cavg 17°C 11°Cavg 5°C +3 GDD 0.2 mm

Tue9/29 12°Cavg 18°C 8°Cavg 6°C +0 GDD 6.2 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 September 20, 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 Mendoza model uses a September 1–April 30 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.