Senador Guiomard weather in December

In December, Senador Guiomard sees average daytime highs of 30°C and overnight lows near 23°C, with 258 mm of rain across 26.1 wet days and about 12.6 hours of daylight. It is the 6th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 3% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of December to 12 h 36 min by month's end. Set against the rest of the year, December is Senador Guiomard's 9th-clearest and 3rd-windiest month. For the whole year in context, see Senador Guiomard's year-round climate.

Daytime high
30°
6th warmest
Overnight low
23°
12th coldest
Rainfall
258 mm
26.1 wet days
Daylight
12 h 36 min
5:09 AM – 5:45 PM
Cloud cover
86%
9th clearest
Wind
6 km/h
3rd windiest
Solar energy
4.88 kWh/m²
Travel score
2.9
out of 10

Senador Guiomard is brasilian municipality.

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 30°C through the month.

A typical December day in Senador Guiomard reaches about 30°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 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
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023
313023

How December really feels in Senador Guiomard

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.

Senador Guiomard weather by month

How December compares with the rest of the year at a glance. December is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°26026.912.52.8
Feb30° / 23°24124.712.32.8
Mar30° / 23°2482712.12.8
Apr30° / 22°16421.911.83.3
May30° / 21°8915.611.54.4
Jun30° / 20°427.811.45.2
Jul31° / 19°275.411.55.2
Aug33° / 20°446.811.74.1
Sep33° / 22°8913.211.93.2
Oct32° / 23°1592012.22.9
Nov31° / 23°22123.312.52.8
Dec30° / 23°25826.112.62.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 6% of December, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1991
2991
3991
4991
5991
61090
71090
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28892
29892
30892
31892

Chance of precipitation in December

Any precipitation

Senador Guiomard gets around 258 mm of rain over 26.1 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 84% and peaks near 85% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
184
284
384
484
584
684
783
883
983
1083
1183
1283
1383
1483
1583
1683
1783
1884
1984
2084
2184
2284
2384
2485
2585
2685
2785
2885
2985
3085
3185

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
106832
206832
306931
406931
506931
607030
707030
807129
907228
1007228
1107327
1207327
1317326
1417326
1517425
1617425
1717524
1817524
1917623
2017722
2117722
2217821
2317821
2417821
2517821
2617920
2717920
2817920
2917920
3017920
3117920

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 36 min at the start of December to 12 h 36 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 5:04 AM to 5:17 AM, and sunset from 5:37 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:045:37
212.65:045:38
312.65:055:38
412.65:055:39
512.65:055:39
612.65:065:40
712.65:065:40
812.65:065:41
912.65:075:41
1012.65:075:42
1112.65:075:42
1212.65:085:43
1312.65:085:43
1412.65:095:44
1512.65:095:44
1612.65:095:45
1712.65:105:45
1812.65:105:46
1912.65:115:46
2012.65:115:47
2112.65:125:47
2212.65:125:48
2312.65:135:48
2412.65:135:49
2512.65:145:49
2612.65:145:50
2712.65:155:50
2812.65:155:50
2912.65:165:51
3012.65:165:51
3112.65:175:52

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.88 kWh/m².

For context, solar energy here swings from a low near 4.25 kWh/m² to a high of 5.57 kWh/m² in September across the year — December's 4.88 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in December

Hazard calendar for Senador Guiomard

In seasonPeak

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

Senador Guiomard's rainy season runs October–April, 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 Senador Guiomard?

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
4.1
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Senador Guiomard.

What to pack for Senador Guiomard in December

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

In December, Senador Guiomard sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

UV index in Senador Guiomard 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 Senador Guiomard peaks around January 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateExtremeJan 20UV 15Sep 12UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May11Extreme
Jun9Very high
Jul8Very high
Aug6High
Sep4Moderate
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Senador Guiomard 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 Senador Guiomard is worst in September — around 60 µg/m³ PM2.5 (unhealthy), about 7.8× the cleanest month (June, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateGoodSep 1457 µg/m³Jun 98 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun8Good
Jul12Good
Aug37Poor
Sep60Unhealthy
Oct23Moderate
Nov13Moderate
Dec11Good
Location & terrain

Where is Senador Guiomard?

Senador Guiomard sits at 10.1°S, 67.7°W, 207 m above sea level, in Brazil. The nearest listed city is Rio Branco, 21 km away.

Topography around Senador Guiomard

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

Within 3 km, the terrain around Senador Guiomard has only modest variations in elevation — a maximum elevation change of 73 m around an average of 193 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 111 m; within 80 km, only modest variations in elevation — a maximum elevation change of 168 m.

The land around Senador Guiomard is covered by grassland (65%) and trees (27%) within 3 km, grassland (56%) and trees (42%) within 16 km, and trees (64%) and grassland (36%) within 80 km.

3 km
73 m
16 km
111 m
80 km
168 m
treesgrasslandartificial surfaceswater
December weather nearby: Rio Branco 21 km · Plácido de Castro 64 km · Porto Acre 66 km · Xapuri 101 km · Brasiléia 147 km · Epitaciolândia 147 km · Cobija 149 km · Sena Madureira 158 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 Senador Guiomard (-10.1497°, -67.7374°, elevation 207 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).