Cerro Azul weather in December

In December, Cerro Azul sees average daytime highs of 28°C and overnight lows near 18°C, with 155 mm of rain across 18.2 wet days and about 13.5 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 13% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 24 min at the start of December to 13 h 30 min by month's end. Set against the rest of the year, December is Cerro Azul's 10th-clearest and 4th-windiest month. For the whole year in context, see Cerro Azul's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
18°
9th coldest
Rainfall
155 mm
18.2 wet days
Daylight
13 h 30 min
6:27 AM – 7:59 PM
Cloud cover
72%
10th clearest
Wind
6 km/h
4th windiest
Solar energy
5.65 kWh/m²
Travel score
4.9
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical December day in Cerro Azul reaches about 28°C in the afternoon and slips back to 18°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 32°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12717
22717
32717
42717
52717
62717
72718
82718
92718
102718
112818
122818
132818
142818
152818
162818
172818
182818
192818
202818
212818
222818
232818
242818
252818
262819
272819
282819
292819
302819
312819

Cerro Azul weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°21822.113.44.2
Feb28° / 19°16819.312.94.4
Mar27° / 18°13317.712.25.3
Apr26° / 16°649.211.46.7
May22° / 13°798.510.86.9
Jun21° / 11°787.810.56.9
Jul21° / 10°717.210.67.0
Aug23° / 11°576.811.17.4
Sep24° / 13°10910.211.86.8
Oct25° / 15°1201412.65.9
Nov26° / 16°11915.213.25.6
Dec28° / 18°15518.213.54.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23169
32971
42971
52971
62872
72872
82872
92872
102872
112971
122971
132971
143169
153169
163169
173070
183169
193268
203268
213268
223268
233268
243070
253070
262971
272971
282971
292971
302773
312773

Chance of precipitation in December

Any precipitation

Cerro Azul gets around 155 mm of rain over 18.2 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 60% and peaks near 66% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
153
254
354
455
555
656
756
857
957
1058
1158
1259
1359
1459
1560
1660
1761
1861
1961
2061
2161
2261
2362
2462
2563
2663
2764
2864
2965
3065
3166

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 57% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
131835412
231835422
331734442
431734452
521733462
621632473
721632473
821631483
921631493
1021530503
1111530513
1211530513
1311430514
1411430514
1511429524
1611329534
1711329525
1811329525
1911229526
2011229526
2111128537
2201028557
2301028548
240928558
250828559
2608285410
2707285510
2807285411
2907275511
3006275512
3106275512

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 24 min at the start of December to 13 h 30 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 6:24 AM to 6:35 AM, and sunset from 7:50 PM to 8:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:247:50
213.46:247:50
313.56:247:51
413.56:247:52
513.56:247:52
613.56:247:53
713.56:257:54
813.56:257:54
913.56:257:55
1013.56:257:56
1113.56:267:56
1213.56:267:57
1313.56:267:57
1413.56:277:58
1513.56:277:59
1613.56:277:59
1713.56:288:00
1813.56:288:00
1913.56:288:01
2013.56:298:01
2113.56:298:02
2213.56:308:02
2313.56:308:03
2413.56:318:03
2513.56:318:04
2613.56:328:04
2713.56:328:04
2813.56:338:05
2913.56:338:05
3013.56:348:06
3113.56:358:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.65 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 5.65 kWh/m² in December across the year — December's 5.65 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.6Bright
295.6Bright
305.6Bright
315.6Bright
Planning a trip in December

Is December a good time to visit Cerro Azul?

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

4.9
Sightseeing
10th-best month of the year
5.3
Beach & pool
7th-best month of the year

December is a reasonable time to visit Cerro Azul for sightseeing.

What to pack for Cerro Azul in December

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

In December, Cerro Azul sees daytime highs around 28°C and nights near 18°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Cerro Azul in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cerro Azul peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 19UV 15Jul 12UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug7High
Sep7High
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Cerro Azul 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 Cerro Azul is worst in September — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (March, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1216 µg/m³Mar 108 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr9Good
May10Good
Jun10Good
Jul11Good
Aug15Moderate
Sep17Moderate
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Cerro Azul?

Cerro Azul sits at 24.8°S, 49.3°W, 317 m above sea level, in Brazil. The nearest listed city is Rio Branco do Sul, 41 km away.

Topography around Cerro Azul

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

Within 3 km, the terrain around Cerro Azul has significant variations in elevation — a maximum elevation change of 320 m around an average of 398 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,029 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,785 m.

The land around Cerro Azul is covered by trees (56%) and grassland (39%) within 3 km, trees (73%) and grassland (26%) within 16 km, and trees (80%) within 80 km.

3 km
320 m
16 km
1,029 m
80 km
1,785 m
treesgrasslandcroplandartificial surfaces
December weather nearby: Rio Branco do Sul 41 km · Itaperuçu 45 km · Colombo 52 km · Apiaí 55 km · Almirante Tamandaré 56 km · Campina Grande do Sul 57 km · Quatro Barras 63 km · Campo Magro 64 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 Cerro Azul (-24.8236°, -49.2611°, elevation 317 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).