Mãe do Rio weather in December

In December, Mãe do Rio sees average daytime highs of 33°C and overnight lows near 24°C, with 92 mm of rain across 14.7 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 11% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of December to 12 h 06 min by month's end. Set against the rest of the year, December is Mãe do Rio's 7th-clearest and 5th-windiest month. For the whole year in context, see Mãe do Rio's year-round climate.

Daytime high
33°
4th warmest
Overnight low
24°
11th coldest
Rainfall
92 mm
14.7 wet days
Daylight
12 h 06 min
6:03 AM – 6:10 PM
Cloud cover
70%
7th clearest
Wind
9 km/h
5th windiest
Solar energy
5.24 kWh/m²
Travel score
2.9
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical December day in Mãe do Rio reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 35°C. Set against its neighbours, December runs about 1°C cooler than November and about 1°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13424
23424
33424
43424
53424
63424
73424
83424
93424
103424
113424
123424
133324
143324
153324
163324
173324
183324
193324
203324
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324
313324

How December really feels in Mãe do Rio

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.

Mãe do Rio weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°19524.612.12.6
Feb31° / 23°27225.612.12.5
Mar31° / 23°34829.9122.4
Apr31° / 23°34128.5122.5
May31° / 23°19725.111.92.8
Jun31° / 23°8517.311.93.6
Jul32° / 22°5511.911.94.1
Aug33° / 23°247.411.93.9
Sep34° / 23°195.3123.5
Oct34° / 24°235.7123.2
Nov34° / 24°43712.13.1
Dec33° / 24°9214.712.12.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 24% of December, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34555
44456
54357
64357
74258
84258
94159
104159
114060
124060
133961
143763
153763
163565
173466
183367
193268
203169
213070
223070
232872
242773
252773
262674
272674
282674
292575
302575
312476

Chance of precipitation in December

Any precipitation

Mãe do Rio gets around 92 mm of rain over 14.7 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 47% and peaks near 67% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
128
229
330
431
532
633
734
836
937
1038
1140
1241
1342
1444
1545
1646
1748
1849
1951
2052
2154
2255
2357
2458
2560
2661
2762
2863
2965
3066
3167

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
17921
27921
36931
46931
55941
65941
75941
84951
94960
104960
114960
124960
134960
143961
153961
163961
173961
183961
193961
203952
213952
223952
232962
242962
252953
262953
272953
282944
292944
302944
312944

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 06 min at the start of December to 12 h 06 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 5:57 AM to 6:10 AM, and sunset from 6:03 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:576:03
212.15:576:04
312.15:576:04
412.15:586:04
512.15:586:05
612.15:596:05
712.15:596:06
812.15:596:06
912.16:006:07
1012.16:006:07
1112.16:016:08
1212.16:016:08
1312.16:016:08
1412.16:026:09
1512.16:026:09
1612.16:036:10
1712.16:036:10
1812.16:046:11
1912.16:046:11
2012.16:056:12
2112.16:056:12
2212.16:066:13
2312.16:066:13
2412.16:076:14
2512.16:076:14
2612.16:086:15
2712.16:086:15
2812.16:086:16
2912.16:096:16
3012.16:096:16
3112.16:106:17

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.24 kWh/m².

For context, solar energy here swings from a low near 4.15 kWh/m² to a high of 6.12 kWh/m² in October across the year — December's 5.24 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in December

Hazard calendar for Mãe do Rio

In seasonPeak

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

Mãe do Rio's monsoon runs January–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 Mãe do Rio?

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

2.9
Sightseeing
7th-best month of the year
5.4
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in Mãe do Rio.

What to pack for Mãe do Rio in December

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

In December, Mãe do Rio sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Mãe do Rio in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mãe do Rio peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 16UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov10Extreme
Dec10Extreme

Air quality in Mãe do Rio 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 Mãe do Rio is worst in November — around 28 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (June, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 2028 µg/m³Jun 208 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb18Moderate
Mar17Moderate
Apr14Moderate
May9Good
Jun8Good
Jul9Good
Aug10Good
Sep12Good
Oct16Moderate
Nov28Moderate
Dec25Moderate
Location & terrain

Where is Mãe do Rio?

Mãe do Rio sits at 2.0°S, 47.6°W, 44 m above sea level, in Brazil. The nearest listed city is Aurora do Pará, 10 km away.

Topography around Mãe do Rio

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

Within 3 km, the terrain around Mãe do Rio has only modest variations in elevation — a maximum elevation change of 35 m around an average of 39 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 79 m; within 80 km, only modest variations in elevation — a maximum elevation change of 167 m.

The land around Mãe do Rio is covered by grassland (61%) and trees (25%) within 3 km, grassland (59%) and trees (40%) within 16 km, and trees (63%) and grassland (36%) within 80 km.

3 km
35 m
16 km
79 m
80 km
167 m
treesgrasslandartificial surfaceswater
December weather nearby: Aurora do Pará 10 km · Irituia 33 km · Concórdia do Pará 45 km · São Miguel do Guamá 47 km · São Domingos do Capim 48 km · Garrafão do Norte 57 km · Ipixuna do Pará 57 km · Capitão Poço 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 Mãe do Rio (-2.0464°, -47.5506°, elevation 44 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).