Vilhena weather in December

In December, Vilhena sees average daytime highs of 28°C and overnight lows near 21°C, with 259 mm of rain across 28.1 wet days and about 12.7 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 2% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Vilhena's 10th-clearest and 5th-windiest month. For the whole year in context, see Vilhena's year-round climate.

Daytime high
28°
9th warmest
Overnight low
21°
12th coldest
Rainfall
259 mm
28.1 wet days
Daylight
12 h 42 min
5:34 AM – 6:19 PM
Cloud cover
85%
10th clearest
Wind
7 km/h
5th windiest
Solar energy
4.98 kWh/m²
Travel score
3.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical December day in Vilhena reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 31°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)
12921
22821
32821
42821
52821
62821
72821
82821
92821
102821
112821
122821
132821
142821
152821
162821
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282821
292821
302821
312821

How December really feels in Vilhena

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Vilhena weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°26729.412.73.2
Feb28° / 21°2742712.43.3
Mar28° / 21°24128.612.13.2
Apr29° / 21°12821.511.74.0
May28° / 20°5712.111.45.5
Jun29° / 19°14311.36.6
Jul30° / 18°102.111.36.4
Aug31° / 20°244.811.65.1
Sep31° / 21°8413.511.94.0
Oct30° / 21°16522.412.33.5
Nov29° / 21°20725.612.63.3
Dec28° / 21°25928.112.73.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 8% of December, with mostly cloudy or overcast conditions the remaining 90%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
111090
12991
13991
14991
151090
161090
171189
181189
191189
201288
211288
221288
231288
241090
251090
261090
271090
281090
29991
30991
31991

Chance of precipitation in December

Any precipitation

Vilhena gets around 259 mm of rain over 28.1 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 91% and peaks near 93% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
191
291
391
491
591
691
791
891
991
1091
1191
1291
1391
1491
1591
1690
1790
1890
1990
2090
2190
2290
2391
2491
2591
2692
2792
2892
2993
3093
3193

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1001090
2001090
300991
400991
500991
600991
700991
800991
910990
1010891
1110891
1210891
1310792
1410792
1511791
1611791
1711791
1811791
1911791
2011890
2111890
2211890
2301891
2401990
2500991
2600991
27001090
28001090
29001090
30001189
31001189

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 42 min at the start of December to 12 h 42 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 5:29 AM to 5:42 AM, and sunset from 6:11 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:296:11
212.75:306:12
312.75:306:12
412.75:306:13
512.75:306:13
612.75:316:14
712.75:316:14
812.75:316:15
912.75:326:15
1012.75:326:16
1112.75:326:17
1212.75:336:17
1312.75:336:18
1412.75:346:18
1512.75:346:19
1612.75:346:19
1712.75:356:20
1812.75:356:20
1912.75:366:21
2012.75:366:21
2112.75:376:22
2212.85:376:22
2312.75:386:23
2412.75:386:23
2512.75:386:23
2612.75:396:24
2712.75:396:24
2812.75:406:25
2912.75:416:25
3012.75:416:26
3112.75:426:26

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.98 kWh/m².

For context, solar energy here swings from a low near 4.53 kWh/m² to a high of 5.73 kWh/m² in October across the year — December's 4.98 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in December

Hazard calendar for Vilhena

In seasonPeak

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

Vilhena's monsoon runs October–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 Vilhena?

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

3.3
Sightseeing
8th-best month of the year
3.9
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Vilhena.

What to pack for Vilhena in December

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

In December, Vilhena sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

UV index in Vilhena in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vilhena peaks around January 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 15 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 22UV 15Sep 15UV 4
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul8Very high
Aug10Very high
Sep3Moderate
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Vilhena 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 Vilhena is worst in September — around 62 µg/m³ PM2.5 (unhealthy), about 7.2× the cleanest month (May, 9 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 1459 µg/m³May 159 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar10Good
Apr9Good
May9Good
Jun9Good
Jul11Good
Aug39Poor
Sep62Unhealthy
Oct22Moderate
Nov16Moderate
Dec11Good
Location & terrain

Where is Vilhena?

Vilhena sits at 12.7°S, 60.1°W, 591 m above sea level, in Brazil. The nearest listed city is Colorado do Oeste, 60 km away.

Topography around Vilhena

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

Within 3 km, the terrain around Vilhena has only modest variations in elevation — a maximum elevation change of 75 m around an average of 585 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 226 m; within 80 km, significant variations in elevation — a maximum elevation change of 438 m.

The land around Vilhena is covered by artificial surfaces (47%) and grassland (26%) within 3 km, trees (50%), cropland (24%) and grassland (20%) within 16 km, and trees (76%) within 80 km.

3 km
75 m
16 km
226 m
80 km
438 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Colorado do Oeste 60 km · Cerejeiras 88 km · Comodoro 110 km · Pimenta Bueno 165 km · Espigão dOeste 165 km · Sapezal 169 km · Cacoal 202 km · Rolim de Moura 208 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 Vilhena (-12.7406°, -60.1458°, elevation 591 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).