Altos weather in December

In December, Altos sees average daytime highs of 35°C and overnight lows near 25°C, with 97 mm of rain across 11.2 wet days and about 12.3 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 35°C in the first days to 34°C by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 18 min by month's end. Set against the rest of the year, December is Altos's 8th-clearest and 7th-windiest month. For the whole year in context, see Altos's year-round climate.

Daytime high
35°
5th warmest
Overnight low
25°
9th coldest
Rainfall
97 mm
11.2 wet days
Daylight
12 h 18 min
5:37 AM – 5:55 PM
Cloud cover
64%
8th clearest
Wind
7 km/h
7th windiest
Solar energy
5.74 kWh/m²
Travel score
2.5
out of 10

Altos is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 35°C in the first days to 34°C by the end.

A typical December day in Altos reaches about 35°C in the afternoon and slips back to 25°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 38°C. Set against its neighbours, December runs about 2°C cooler than November and about 2°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13625
23625
33625
43525
53525
63525
73525
83525
93525
103525
113525
123525
133525
143525
153525
163525
173525
183525
193425
203425
213425
223425
233424
243424
253424
263424
273424
283424
293424
303424
313324

How December really feels in Altos

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.

Altos weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°25722.412.32.7
Feb32° / 23°29922.512.22.7
Mar31° / 23°37127122.6
Apr31° / 23°29723.611.92.9
May32° / 23°12912.711.83.8
Jun33° / 23°183.511.74.2
Jul34° / 24°91.511.74.0
Aug35° / 24°20.511.83.2
Sep36° / 25°40.8122.3
Oct37° / 25°172.212.11.9
Nov36° / 25°375.512.22.1
Dec35° / 25°9711.212.32.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 22% of December, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45248
55248
65149
75149
85050
94951
104951
114852
124852
134753
144654
154654
164456
174456
184357
194258
204258
214159
224060
234060
244060
253862
263862
273763
283664
293664
303565
313367

Chance of precipitation in December

Any precipitation

Altos gets around 97 mm of rain over 11.2 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 38% and peaks near 57% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
123
224
324
425
525
626
727
827
928
1029
1131
1232
1333
1435
1536
1637
1738
1840
1941
2042
2143
2244
2345
2447
2548
2649
2751
2852
2954
3055
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 57% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
111445391
211345401
311345401
411245401
511245411
611244421
711144431
811143441
911042451
1011041471
111940481
121840501
131839511
140738541
150637561
160636571
170535591
180534601
190433621
200432631
210431641
220430651
230329671
240327691
250326701
260325711
270323722
280321742
290320752
300318772
310317782

Wind in December

Winds average 7 km/h in December.

Across December, daily wind ranges from about 7 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
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:31 AM to 5:44 AM, and sunset from 5:48 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:315:48
212.35:325:48
312.35:325:49
412.35:325:49
512.35:335:50
612.35:335:50
712.35:345:50
812.35:345:51
912.35:345:51
1012.35:355:52
1112.35:355:52
1212.35:365:53
1312.35:365:53
1412.35:365:54
1512.35:375:54
1612.35:375:55
1712.35:385:55
1812.35:385:56
1912.35:395:56
2012.35:395:57
2112.35:405:57
2212.35:405:58
2312.35:415:58
2412.35:415:59
2512.35:415:59
2612.35:425:59
2712.35:426:00
2812.35:436:00
2912.35:436:01
3012.35:446:01
3112.35:446:02

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.74 kWh/m².

For context, solar energy here swings from a low near 4.84 kWh/m² to a high of 6.72 kWh/m² in October across the year — December's 5.74 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Intense
46.0Intense
56.0Bright
66.0Bright
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in December

Hazard calendar for Altos

In seasonPeak

None of Altos's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Altos's monsoon runs January–April, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Altos?

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

2.5
Sightseeing
9th-best month of the year
5.3
Beach & pool
6th-best month of the year

December is a weaker month for outdoor sightseeing in Altos.

What to pack for Altos in December

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

In December, Altos sees daytime highs around 35°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Altos in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Altos peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 15Aug 10UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec11Extreme

Air quality in Altos 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 Altos is worst in October — around 35 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 8 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 1633 µg/m³Jun 199 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb16Moderate
Mar15Moderate
Apr14Moderate
May12Good
Jun8Good
Jul10Good
Aug16Moderate
Sep25Moderate
Oct35Moderate
Nov23Moderate
Dec17Moderate
Location & terrain

Where is Altos?

Altos sits at 5.0°S, 42.5°W, 192 m above sea level, in Brazil. The nearest listed city is José de Freitas, 34 km away.

Topography around Altos

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

Within 3 km, the terrain around Altos has only modest variations in elevation — a maximum elevation change of 103 m around an average of 184 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 175 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Altos is covered by trees (30%), shrubs (26%) and grassland (23%) within 3 km, trees (58%), shrubs (21%) and grassland (20%) within 16 km, and trees (42%), shrubs (32%) and grassland (23%) within 80 km.

3 km
103 m
16 km
175 m
80 km
375 m
treesshrubsgrasslandcroplandartificial surfaces
December weather nearby: José de Freitas 34 km · Teresina 38 km · Campo Maior 40 km · Timon 42 km · Demerval Lobão 43 km · União 67 km · Barras 90 km · Água Branca 97 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 Altos (-5.0381°, -42.46°, elevation 192 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).