Yby Yaú weather in December

In December, Yby Yaú sees average daytime highs of 32°C and overnight lows near 22°C, with 180 mm of rain across 16.4 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 31% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 18 min at the start of December to 13 h 24 min by month's end. Set against the rest of the year, December is Yby Yaú's 10th-clearest and 9th-windiest month. For the whole year in context, see Yby Yaú's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
22°
10th coldest
Rainfall
180 mm
16.4 wet days
Daylight
13 h 24 min
6:00 AM – 7:24 PM
Cloud cover
60%
10th clearest
Wind
9 km/h
9th windiest
Solar energy
6.41 kWh/m²
Travel score
3.5
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical December day in Yby Yaú reaches about 32°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 35°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53222
63222
73222
83222
93222
103222
113222
123222
133222
143222
153222
163222
173222
183222
193222
203222
213222
223222
233222
243223
253223
263223
273223
283223
293223
303223
313223

How December really feels in Yby Yaú

Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Yby Yaú weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°16117.113.33.3
Feb32° / 22°14815.312.83.5
Mar31° / 22°11912.812.24.2
Apr29° / 20°105911.55.5
May26° / 17°1369.110.97.0
Jun25° / 16°1038.410.67.3
Jul25° / 15°796.810.77.6
Aug28° / 16°806.211.27.1
Sep29° / 18°1118.911.95.6
Oct31° / 20°17212.812.54.4
Nov31° / 21°1671313.14.1
Dec32° / 22°18016.413.43.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34456
44456
54456
64456
74555
84555
94555
104753
114753
124852
135050
145149
155248
165347
175446
185545
195545
205545
215446
225446
235347
245149
255149
265050
275050
284951
294852
304852
314951

Chance of precipitation in December

Any precipitation

Yby Yaú gets around 180 mm of rain over 16.4 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 52% and peaks near 57% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
149
250
351
452
552
652
752
852
952
1052
1151
1251
1351
1450
1550
1649
1749
1849
1949
2049
2150
2251
2352
2453
2554
2655
2756
2856
2956
3057
3157

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the oppressive band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 88% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1151330510
2151229521
3141228541
4141128551
5141127561
6141127561
7131126581
8131126581
9131126581
10131125582
11131125582
12131125582
13121025602
14121026592
15121026592
16121026592
17121026592
1812927592
1912927592
2012827602
2112826621
2211726641
2311726641
2411625661
2501525681
2601524691
2701524691
2801424701
2901423711
3001423711
3101423711

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 18 min at the start of December to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:57 AM to 6:08 AM, and sunset from 7:15 PM to 7:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:577:15
213.35:577:16
313.35:577:17
413.35:577:17
513.35:577:18
613.45:577:18
713.45:587:19
813.45:587:20
913.45:587:20
1013.45:587:21
1113.45:597:22
1213.45:597:22
1313.45:597:23
1413.46:007:23
1513.46:007:24
1613.46:007:24
1713.46:017:25
1813.46:017:25
1913.46:017:26
2013.46:027:27
2113.46:027:27
2213.46:037:27
2313.46:037:28
2413.46:047:28
2513.46:047:29
2613.46:057:29
2713.46:057:30
2813.46:067:30
2913.46:067:30
3013.46:077:31
3113.46:087:31

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.41 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.13 kWh/m² to a high of 6.41 kWh/m² in December across the year — December's 6.41 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.4Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in December

Is December a good time to visit Yby Yaú?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.5
Sightseeing
10th-best month of the year
5.6
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Yby Yaú.

What to pack for Yby Yaú in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Yby Yaú sees daytime highs around 32°C and nights near 22°C. Pack light clothes, rain gear and sun protection. About 16 days see rain.

light clothesrain gearsun protection

UV index in Yby Yaú in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yby Yaú peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 19UV 15Jul 10UV 6
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug7Very high
Sep6High
Oct10Very high
Nov13Extreme
Dec13Extreme

Air quality in Yby Yaú in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Yby Yaú is worst in September — around 39 µg/m³ PM2.5 (poor), about 6.3× the cleanest month (April, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodSep 939 µg/m³Apr 126 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar7Good
Apr6Good
May7Good
Jun9Good
Jul10Good
Aug39Poor
Sep39Poor
Oct21Moderate
Nov13Moderate
Dec9Good
Location & terrain

Where is Yby Yaú?

Yby Yaú sits at 23.0°S, 56.5°W, 184 m above sea level, in Paraguay. The nearest listed city is Pedro Juan Caballero, 94 km away.

Pedro Juan CaballeroBela VistaPonta PorãConcepciónAmambaiJardimCaarapóDourados

Topography around Yby Yaú

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yby Yaú.

Within 3 km, the terrain around Yby Yaú has only modest variations in elevation — a maximum elevation change of 101 m around an average of 197 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 264 m; within 80 km, large variations in elevation — a maximum elevation change of 667 m.

The land around Yby Yaú is covered by grassland (53%) and trees (41%) within 3 km, grassland (67%) and trees (30%) within 16 km, and grassland (56%) and trees (36%) within 80 km.

3 km
101 m
16 km
264 m
80 km
667 m
treesgrasslandcroplandartificial surfaces
December weather nearby: Pedro Juan Caballero 94 km · Bela Vista 95 km · Ponta Porã 96 km · Concepción 103 km · Amambai 135 km · Jardim 170 km · Caarapó 180 km · Dourados 196 km

Paraguay travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / N
220 V · 50 Hz
Prices
≈ 35% of US
price level, 2025
GDP per capita
$7,027
2025
Happiness
6.2 / 10
World Happiness, 2025
Safe drinking water
64%
of population, 2024
Homicide rate
6.8
per 100k, 2023
Road deaths
22
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 531
Religion
Roman Catholic 80%Protestant 7%Believer 6%other 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Yby Yaú (-22.9661°, -56.5407°, elevation 184 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).