Imperatriz weather in December

In December, Imperatriz sees average daytime highs of 31°C and overnight lows near 23°C, with 146 mm of rain across 20.2 wet days and about 12.3 hours of daylight. It is the 8th-warmest and 5th-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 8% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 18 min by month's end. Set against the rest of the year, December is Imperatriz's 8th-clearest and 8th-windiest month. For the whole year in context, see Imperatriz's year-round climate.

Daytime high
31°
8th warmest
Overnight low
23°
10th coldest
Rainfall
146 mm
20.2 wet days
Daylight
12 h 18 min
5:57 AM – 6:16 PM
Cloud cover
76%
8th clearest
Wind
5 km/h
8th windiest
Solar energy
5.07 kWh/m²
Travel score
3.2
out of 10

Imperatriz is human settlement in Brazil.

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 31°C through the month.

A typical December day in Imperatriz 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 29°C and 33°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123124
133124
143124
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313123

How December really feels in Imperatriz

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.

Imperatriz weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°20726.112.32.9
Feb30° / 23°20523.912.22.9
Mar31° / 23°21226.4122.9
Apr31° / 23°15120.711.93.2
May32° / 23°7411.811.84.0
Jun33° / 22°81.811.74.5
Jul34° / 22°61.111.74.1
Aug35° / 22°20.411.83.6
Sep35° / 23°102123.3
Oct34° / 24°396.312.13.4
Nov32° / 24°10014.212.33.3
Dec31° / 23°14620.212.33.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 76%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23268
33268
43169
53169
63169
73169
83070
92971
102872
112674
122674
132476
142476
152278
162278
172179
182080
192080
202080
212080
221981
231981
241981
251981
261981
271981
281882
291882
301882
311684

Chance of precipitation in December

Any precipitation

Imperatriz gets around 146 mm of rain over 20.2 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 66% and peaks near 77% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
155
255
355
455
555
656
757
858
959
1060
1162
1263
1364
1466
1567
1668
1769
1870
1971
2071
2172
2272
2373
2473
2574
2674
2775
2875
2976
3077
3177

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 90% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
13889
23889
32899
42899
52899
62899
72899
81909
91909
101909
111909
121909
131909
140919
150919
160919
170919
180919
190919
200919
210919
220919
230919
240919
250919
260919
270919
280919
2909010
3009010
3109010

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 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
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 18 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 5:51 AM to 6:04 AM, and sunset from 6:09 PM to 6:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:516:09
212.35:516:09
312.35:516:10
412.35:526:10
512.35:526:10
612.35:526:11
712.35:536:11
812.35:536:12
912.35:546:12
1012.35:546:13
1112.35:546:13
1212.35:556:14
1312.35:556:14
1412.35:566:15
1512.35:566:15
1612.35:576:16
1712.35:576:16
1812.35:576:17
1912.35:586:17
2012.35:586:18
2112.35:596:18
2212.35:596:19
2312.36:006:19
2412.36:006:19
2512.36:016:20
2612.36:016:20
2712.36:026:21
2812.36:026:21
2912.36:036:22
3012.36:036:22
3112.36:046:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.07 kWh/m².

For context, solar energy here swings from a low near 4.5 kWh/m² to a high of 6.3 kWh/m² in September across the year — December's 5.07 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.7Bright
314.7Bright
Planning a trip in December

Hazard calendar for Imperatriz

In seasonPeak

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

Imperatriz's monsoon runs November–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 Imperatriz?

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

3.2
Sightseeing
8th-best month of the year
4.8
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Imperatriz.

What to pack for Imperatriz in December

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

In December, Imperatriz 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 Imperatriz 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 Imperatriz peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 12UV 15Jul 12UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Imperatriz 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 Imperatriz is worst in October — around 29 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 2329 µg/m³Jun 206 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar13Moderate
Apr12Moderate
May9Good
Jun6Good
Jul7Good
Aug12Moderate
Sep23Moderate
Oct29Moderate
Nov29Moderate
Dec20Moderate
Location & terrain

Where is Imperatriz?

Imperatriz sits at 5.5°S, 47.5°W, 127 m above sea level, in Brazil. The nearest listed city is João Lisboa, 13 km away.

Topography around Imperatriz

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

Within 3 km, the terrain around Imperatriz has only modest variations in elevation — a maximum elevation change of 43 m around an average of 119 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 153 m; within 80 km, significant variations in elevation — a maximum elevation change of 438 m.

The land around Imperatriz is covered by artificial surfaces (46%), trees (21%) and grassland (20%) within 3 km, grassland (46%) and trees (44%) within 16 km, and grassland (54%) and trees (43%) within 80 km.

3 km
43 m
16 km
153 m
80 km
438 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: João Lisboa 13 km · Governador Edison Lobão 28 km · Açailândia 64 km · Araguatins 70 km · Amarante do Maranhão 83 km · Tocantinópolis 90 km · Porto Franco 91 km · Sítio Novo 96 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 Imperatriz (-5.5264°, -47.4917°, elevation 127 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).