Altamira weather in December

In December, Altamira sees average daytime highs of 31°C and overnight lows near 24°C, with 152 mm of rain across 21.9 wet days and about 12.2 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 8% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of December to 12 h 12 min by month's end. Set against the rest of the year, December is Altamira's 7th-clearest and 5th-windiest month. For the whole year in context, see Altamira's year-round climate.

Daytime high
31°
6th warmest
Overnight low
24°
9th coldest
Rainfall
152 mm
21.9 wet days
Daylight
12 h 12 min
6:19 AM – 6:31 PM
Cloud cover
76%
7th clearest
Wind
7 km/h
5th windiest
Solar energy
4.9 kWh/m²
Travel score
3.2
out of 10

Altamira 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

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in Altamira reaches about 31°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, December runs about 1°C cooler than November and about 1°C warmer than January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183123
193123
203123
213123
223123
233123
243123
253123
263023
273023
283023
293023
303023
313023

How December really feels in Altamira

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.

Altamira weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°24828.112.22.8
Feb29° / 23°27326.512.12.8
Mar30° / 23°32829.1122.8
Apr30° / 23°28128.211.92.7
May30° / 23°19026.211.93.0
Jun31° / 23°7116.611.83.9
Jul31° / 22°4610.211.84.4
Aug33° / 23°317.311.93.9
Sep33° / 24°347123.7
Oct33° / 24°6011.212.13.4
Nov32° / 24°1001512.13.3
Dec31° / 24°15221.912.23.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
22971
32971
42971
52773
62773
72773
82674
92575
102575
112476
122476
132278
142179
152179
162080
172080
181882
191882
201783
211783
221783
231783
241684
251684
261684
271684
281684
291684
301684
311684

Chance of precipitation in December

Any precipitation

Altamira gets around 152 mm of rain over 21.9 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 70% and peaks near 87% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
153
253
353
454
555
656
757
858
960
1061
1163
1265
1367
1468
1570
1672
1773
1875
1976
2078
2179
2280
2381
2482
2583
2684
2785
2885
2986
3086
3187

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 94% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
12935
22935
32935
42935
51954
61954
71954
81954
91954
101945
111945
121945
130955
140955
150955
160955
170955
180955
190955
200955
210955
220955
230955
240955
250955
260946
270946
280946
290937
300937
310937

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 12 min at the start of December to 12 h 12 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 6:13 AM to 6:26 AM, and sunset from 6:24 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:136:24
212.26:146:24
312.26:146:25
412.26:146:25
512.26:156:25
612.26:156:26
712.26:166:26
812.26:166:27
912.26:166:27
1012.26:176:28
1112.26:176:28
1212.26:186:29
1312.26:186:29
1412.26:196:30
1512.26:196:30
1612.26:196:31
1712.26:206:31
1812.26:206:31
1912.26:216:32
2012.26:216:32
2112.26:226:33
2212.26:226:33
2312.26:236:34
2412.26:236:34
2512.26:246:35
2612.26:246:35
2712.26:256:36
2812.26:256:36
2912.26:266:37
3012.26:266:37
3112.26:266:37

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.9 kWh/m².

For context, solar energy here swings from a low near 3.84 kWh/m² to a high of 6.18 kWh/m² in October across the year — December's 4.9 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.6Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.4Bright
314.4Bright
Planning a trip in December

Hazard calendar for Altamira

In seasonPeak

In December, Altamira sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Altamira's monsoon runs December–May, 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 Altamira?

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

3.2
Sightseeing
7th-best month of the year
4.7
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in Altamira.

What to pack for Altamira in December

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

In December, Altamira sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Altamira 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 Altamira peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 16UV 15Jun 23UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr15Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec11Extreme

Air quality in Altamira 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 Altamira is worst in November — around 40 µg/m³ PM2.5 (poor), about 4.7× the cleanest month (June, 9 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateNov 1238 µg/m³Jun 229 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar15Moderate
Apr13Moderate
May10Good
Jun9Good
Jul9Good
Aug12Good
Sep18Moderate
Oct34Moderate
Nov40Poor
Dec23Moderate
Location & terrain

Where is Altamira?

Altamira sits at 3.2°S, 52.2°W, 101 m above sea level, in Brazil. The nearest listed city is Brasil Novo, 39 km away.

Topography around Altamira

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

Within 3 km, the terrain around Altamira has only modest variations in elevation — a maximum elevation change of 105 m around an average of 116 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 210 m; within 80 km, significant variations in elevation — a maximum elevation change of 405 m.

The land around Altamira is covered by trees (31%), artificial surfaces (29%) and grassland (21%) within 3 km, grassland (44%) and trees (42%) within 16 km, and trees (65%) and grassland (29%) within 80 km.

3 km
105 m
16 km
210 m
80 km
405 m
treesgrasslandartificial surfacesbare terrainwater
December weather nearby: Brasil Novo 39 km · Vitória do Xingu 42 km · Senador José Porfírio 74 km · Medicilândia 80 km · Anapu 116 km · Porto de Moz 162 km · Uruará 179 km · Pacajá 188 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 Altamira (-3.2033°, -52.2064°, elevation 101 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).