Jaru weather in December

In December, Jaru sees average daytime highs of 30°C and overnight lows near 23°C, with 243 mm of rain across 27.1 wet days and about 12.6 hours of daylight. It is the 7th-warmest and 4th-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 2% 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 Jaru's 9th-clearest and 6th-windiest month. For the whole year in context, see Jaru's year-round climate.

Daytime high
30°
7th warmest
Overnight low
23°
10th coldest
Rainfall
243 mm
27.1 wet days
Daylight
12 h 36 min
5:48 AM – 6:24 PM
Cloud cover
86%
9th clearest
Wind
5 km/h
6th windiest
Solar energy
4.9 kWh/m²
Travel score
2.9
out of 10

Jaru 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 30°C through the month.

A typical December day in Jaru 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 27°C and 32°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)
13023
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193023
203023
213023
223023
233023
243022
253022
263022
273022
283022
293023
303023
313023

How December really feels in Jaru

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.

Jaru weather by month

How December compares with the rest of the year at a glance. December is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°27528.212.52.9
Feb30° / 22°27126.212.32.8
Mar30° / 22°24727.912.12.9
Apr30° / 22°15323.111.83.3
May30° / 22°7514.711.54.4
Jun31° / 21°173.911.45.2
Jul33° / 20°102.211.54.7
Aug34° / 21°254.911.73.6
Sep34° / 22°8213.511.93.0
Oct32° / 23°13620.312.22.8
Nov31° / 23°19923.812.52.9
Dec30° / 23°24327.112.62.9

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 7% of December, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1892
2892
3892
4991
5991
6991
7991
8991
9991
101090
111090
121090
131090
141189
151189
161189
171189
181189
191090
201090
211090
221090
23991
24991
25991
26892
27892
28892
29793
30694
31694

Chance of precipitation in December

Any precipitation

Jaru gets around 243 mm of rain over 27.1 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 87% and peaks near 90% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
184
284
384
484
584
685
785
885
985
1085
1186
1286
1386
1487
1587
1687
1788
1888
1988
2089
2189
2289
2389
2489
2589
2690
2790
2890
2990
3090
3190

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
10937
20937
30946
40946
50946
60946
70955
80955
90955
100955
111954
121954
131954
141954
151954
161963
171963
181963
191963
201963
211963
221963
231963
241954
251954
261954
271954
280964
290955
300955
310946

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 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 5:43 AM to 5:55 AM, and sunset from 6:17 PM to 6:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:436:17
212.65:436:17
312.65:436:18
412.65:436:18
512.65:446:19
612.65:446:19
712.65:446:20
812.65:456:20
912.65:456:21
1012.65:456:21
1112.65:466:22
1212.65:466:22
1312.65:476:23
1412.65:476:23
1512.65:476:24
1612.65:486:24
1712.65:486:25
1812.65:496:25
1912.65:496:26
2012.65:506:26
2112.65:506:27
2212.65:516:27
2312.65:516:28
2412.65:516:28
2512.65:526:29
2612.65:526:29
2712.65:536:29
2812.65:536:30
2912.65:546:30
3012.65:546:31
3112.65:556:31

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.9 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 5.68 kWh/m² in October across the year — December's 4.9 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
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
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in December

Hazard calendar for Jaru

In seasonPeak

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

Jaru'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 Jaru?

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
4.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Jaru.

What to pack for Jaru in December

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

In December, Jaru sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in Jaru 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 Jaru peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 24UV 15Sep 12UV 3
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May10Extreme
Jun9Very high
Jul9Very high
Aug6High
Sep3Moderate
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Jaru 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 Jaru is worst in September — around 57 µg/m³ PM2.5 (unhealthy), about 7.3× the cleanest month (June, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodPoorModerateSep 1454 µg/m³Jun 198 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb12Good
Mar13Moderate
Apr10Good
May9Good
Jun8Good
Jul8Good
Aug39Poor
Sep57Unhealthy
Oct24Moderate
Nov17Moderate
Dec14Moderate
Location & terrain

Where is Jaru?

Jaru sits at 10.4°S, 62.5°W, 159 m above sea level, in Brazil. The nearest listed city is Ouro Preto do Oeste, 44 km away.

Topography around Jaru

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

Within 3 km, the terrain around Jaru has only modest variations in elevation — a maximum elevation change of 78 m around an average of 161 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 230 m; within 80 km, significant variations in elevation — a maximum elevation change of 465 m.

The land around Jaru is covered by grassland (40%), artificial surfaces (31%) and trees (27%) within 3 km, grassland (73%) and trees (25%) within 16 km, and grassland (66%) and trees (33%) within 80 km.

3 km
78 m
16 km
230 m
80 km
465 m
treesgrasslandartificial surfacesbare terrainwater
December weather nearby: Ouro Preto do Oeste 44 km · Ji Paraná 75 km · Ariquemes 86 km · Presidente Médici 103 km · Alto Paraíso 122 km · Machadinho d'Oeste 123 km · São Miguel do Guaporé 142 km · Buritis 151 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 Jaru (-10.4389°, -62.4664°, elevation 159 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).