Rorainópolis weather in December

In December, Rorainópolis sees average daytime highs of 31°C and overnight lows near 23°C, with 161 mm of rain across 19.9 wet days and about 11.9 hours of daylight. It is the 7th-warmest and 7th-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 7% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of December to 11 h 54 min by month's end. Set against the rest of the year, December is Rorainópolis's 7th-clearest and 4th-windiest month. For the whole year in context, see Rorainópolis's year-round climate.

Daytime high
31°
7th warmest
Overnight low
23°
10th coldest
Rainfall
161 mm
19.9 wet days
Daylight
11 h 54 min
5:59 AM – 5:56 PM
Cloud cover
78%
7th clearest
Wind
6 km/h
4th windiest
Solar energy
4.68 kWh/m²
Travel score
3.4
out of 10

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 Rorainópolis reaches about 31°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313123

How December really feels in Rorainópolis

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.

Rorainópolis weather by month

How December compares with the rest of the year at a glance. December is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°11715123.8
Feb31° / 24°10813.2123.7
Mar31° / 24°18418.1123.5
Apr30° / 23°34824.7123.1
May29° / 23°45629.4122.9
Jun29° / 23°34128.412.12.9
Jul29° / 22°24828.2123.1
Aug30° / 23°18525.1123.2
Sep32° / 23°14720.6123.1
Oct32° / 23°12918.5123.2
Nov31° / 23°16120.4123.1
Dec31° / 23°16119.911.93.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% 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 80%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12575
22575
32377
42377
52278
62278
72278
82179
92179
102080
111981
121981
131882
141882
151882
161882
171882
181882
191882
201981
212080
222080
232080
242179
252179
262179
272179
282179
292278
302179
312179

Chance of precipitation in December

Any precipitation

Rorainópolis gets around 161 mm of rain over 19.9 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 64% and peaks near 67% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
164
264
364
465
565
665
765
865
966
1066
1166
1267
1367
1467
1567
1667
1767
1866
1966
2066
2165
2264
2364
2463
2562
2661
2760
2860
2959
3058
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 66% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
125642
225741
325840
435839
535938
636037
736136
846036
946135
1046234
1156134
1256233
1356233
1456332
1556431
1656530
1756629
1866727
1966826
2066925
2167024
2267123
2367222
2467321
2577419
2677518
2787517
2887616
2997615
3097615
31107614

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 54 min at the start of December to 11 h 54 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 5:53 AM to 6:06 AM, and sunset from 5:50 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:535:50
211.95:535:50
311.95:545:51
411.95:545:51
511.95:555:51
611.95:555:52
711.95:555:52
811.95:565:53
911.95:565:53
1011.95:575:54
1111.95:575:54
1211.95:585:54
1311.95:585:55
1411.95:595:55
1511.95:595:56
1611.95:595:56
1711.96:005:57
1811.96:005:57
1911.96:015:58
2011.96:015:58
2111.96:025:59
2211.96:025:59
2311.96:035:59
2411.96:036:00
2511.96:046:00
2611.96:046:01
2711.96:056:01
2811.96:056:02
2911.96:066:02
3011.96:066:03
3111.96:066:03

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.68 kWh/m².

For context, solar energy here swings from a low near 3.53 kWh/m² to a high of 5.36 kWh/m² in October across the year — December's 4.68 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in December

Hazard calendar for Rorainópolis

In seasonPeak

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

Rorainópolis's rainy season runs April–July, when most of the year's rain falls.

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

Is December a good time to visit Rorainópolis?

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

3.4
Sightseeing
4th-best month of the year
5.0
Beach & pool
5th-best month of the year

December is a weaker month for outdoor sightseeing in Rorainópolis.

What to pack for Rorainópolis in December

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

In December, Rorainópolis sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Rorainópolis 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 Rorainópolis peaks around March 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 16 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeMar 19UV 15Nov 16UV 10
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr15Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec11Extreme

Air quality in Rorainópolis 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 Rorainópolis is worst in March — around 33 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (July, 9 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1732 µg/m³Jul 119 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb24Moderate
Mar33Moderate
Apr25Moderate
May11Good
Jun9Good
Jul9Good
Aug11Good
Sep12Good
Oct14Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Rorainópolis?

Rorainópolis sits at 0.9°N, 60.4°W, 82 m above sea level, in Brazil. The nearest listed city is Caracaraí, 125 km away.

Alto AlegreLethemPresidente FigueiredoBarcelos

Topography around Rorainópolis

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

Within 3 km, the terrain around Rorainópolis has only modest variations in elevation — a maximum elevation change of 49 m around an average of 87 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 226 m; within 80 km, large variations in elevation — a maximum elevation change of 858 m.

The land around Rorainópolis is covered by grassland (46%) and trees (45%) within 3 km, trees (66%) and grassland (34%) within 16 km, and trees (81%) within 80 km.

3 km
49 m
16 km
226 m
80 km
858 m
treesgrasslandartificial surfaceswetland
December weather nearby: Caracaraí 125 km · Mucajaí 175 km · Cantá 186 km · Boa Vista 210 km · Alto Alegre 248 km · Lethem 278 km · Presidente Figueiredo 334 km · Barcelos 351 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 Rorainópolis (0.9461°, -60.4181°, elevation 82 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).