Rosana weather in December

In December, Rosana sees average daytime highs of 31°C and overnight lows near 23°C, with 165 mm of rain across 17.2 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 2nd-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 26% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 18 min at the start of December to 13 h 24 min by month's end. Set against the rest of the year, December is Rosana's 11th-clearest and 9th-windiest month. For the whole year in context, see Rosana's year-round climate.

Daytime high
31°
1st warmest
Overnight low
23°
10th coldest
Rainfall
165 mm
17.2 wet days
Daylight
13 h 24 min
6:47 AM – 8:10 PM
Cloud cover
65%
11th clearest
Wind
8 km/h
9th windiest
Solar energy
6.16 kWh/m²
Travel score
3.7
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 Rosana reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°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 Rosana

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.

Rosana weather by month

How December compares with the rest of the year at a glance. December is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°18819.713.23.4
Feb31° / 23°16017.612.83.5
Mar31° / 23°12715.112.24.2
Apr29° / 21°697.611.55.9
May26° / 18°897.610.97.3
Jun25° / 17°596.110.67.8
Jul25° / 16°434.910.88.0
Aug27° / 17°434.411.27.7
Sep29° / 19°857.911.96.0
Oct30° / 21°13013.212.54.6
Nov31° / 22°13113.313.14.3
Dec31° / 23°16517.213.43.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24060
34159
44060
53961
63862
73961
83862
93961
103961
113961
124159
134159
144258
154357
164357
174456
184456
194456
204456
214456
224357
234258
244159
254159
264159
273961
283961
293862
303862
313862

Chance of precipitation in December

Any precipitation

Rosana gets around 165 mm of rain over 17.2 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 55% and peaks near 63% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
250
351
452
552
652
753
853
953
1053
1153
1253
1353
1453
1553
1653
1753
1853
1954
2054
2155
2256
2357
2458
2559
2660
2761
2862
2962
3062
3163

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 63% of days. Sticky, muggy-or-worse air turns up on roughly 91% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1131331511
2131230531
3131130541
4131030551
5121030561
612929581
712929581
802929591
902829601
1002829601
1102829601
1202829601
1302829601
1402829601
1502729611
1601729621
1701729621
1801729621
1901729621
2001628641
2101628641
2201627651
2301526671
2400525691
2500524701
2600424702
2700423712
2800422722
2900322732
3000321742
3100320752

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 18 min at the start of December to 13 h 24 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 6:43 AM to 6:54 AM, and sunset from 8:01 PM to 8:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:438:01
213.36:448:01
313.36:448:02
413.36:448:02
513.36:448:03
613.36:448:04
713.36:448:04
813.36:458:05
913.36:458:06
1013.46:458:06
1113.46:458:07
1213.46:468:07
1313.46:468:08
1413.46:468:09
1513.46:478:09
1613.46:478:10
1713.46:478:10
1813.46:488:11
1913.46:488:11
2013.46:498:12
2113.46:498:12
2213.46:508:13
2313.46:508:13
2413.46:518:14
2513.46:518:14
2613.46:528:15
2713.46:528:15
2813.46:538:15
2913.46:538:16
3013.46:548:16
3113.46:548:16

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.16 kWh/m².

For context, solar energy here swings from a low near 3.43 kWh/m² to a high of 6.17 kWh/m² in November across the year — December's 6.16 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
316.0Intense
Planning a trip in December

Hazard calendar for Rosana

In seasonPeak

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

Rosana's rainy season runs September–March, 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 Rosana?

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

3.7
Sightseeing
10th-best month of the year
5.5
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Rosana.

What to pack for Rosana in December

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

In December, Rosana sees daytime highs around 31°C and nights near 23°C. Pack light clothes, rain gear and sun protection. About 17 days see rain.

light clothesrain gearsun protection

UV index in Rosana in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rosana peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateExtremeJan 19UV 15Sep 14UV 4
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep3Moderate
Oct11Extreme
Nov12Extreme
Dec13Extreme

Air quality in Rosana 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 Rosana is worst in September — around 35 µg/m³ PM2.5 (moderate), about 6.4× the cleanest month (March, 5 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1632 µg/m³Mar 205 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar5Good
Apr6Good
May7Good
Jun7Good
Jul7Good
Aug11Good
Sep35Moderate
Oct13Moderate
Nov9Good
Dec6Good
Location & terrain

Where is Rosana?

Rosana sits at 22.6°S, 53.1°W, 285 m above sea level, in Brazil. The nearest listed city is Taquarussu, 32 km away.

Topography around Rosana

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

Within 3 km, the terrain around Rosana has only modest variations in elevation — a maximum elevation change of 73 m around an average of 251 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 178 m; within 80 km, significant variations in elevation — a maximum elevation change of 394 m.

The land around Rosana is covered by grassland (52%), trees (21%) and water (21%) within 3 km, grassland (51%) within 16 km, and grassland (42%) and cropland (35%) within 80 km.

3 km
73 m
16 km
178 m
80 km
394 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Taquarussu 32 km · Loanda 39 km · Nova Andradina 48 km · Paranavaí 82 km · Teodoro Sampaio 92 km · Nova Esperança 110 km · Colorado 115 km · Bataguassu 116 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 Rosana (-22.5797°, -53.0592°, elevation 285 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).