Serro weather in December

In December, Serro sees average daytime highs of 26°C and overnight lows near 18°C, with 309 mm of rain across 21.6 wet days and about 13.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 10% of the time in December, and the air most often feels humid.

Daylight stretches from about 13 hours at the start of December to 13 h 06 min by month's end. Set against the rest of the year, December is Serro's 12th-clearest and 9th-windiest month. For the whole year in context, see Serro's year-round climate.

Daytime high
26°
5th warmest
Overnight low
18°
11th coldest
Rainfall
309 mm
21.6 wet days
Daylight
13 h 06 min
6:16 AM – 7:23 PM
Cloud cover
79%
12th clearest
Wind
7 km/h
9th windiest
Solar energy
5.46 kWh/m²
Travel score
4.7
out of 10

Serro 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 26°C through the month.

A typical December day in Serro reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12517
22517
32517
42617
52618
62618
72618
82618
92618
102618
112618
122618
132618
142618
152618
162618
172618
182618
192618
202618
212618
222618
232618
242618
252618
262618
272618
282618
292618
302618
312618

Serro weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 18°22417135.3
Feb27° / 18°15513.312.65.7
Mar26° / 17°17816.712.15.5
Apr25° / 16°9012.111.66.4
May24° / 14°346.811.17.4
Jun23° / 13°112.710.98.0
Jul23° / 12°82.2118.2
Aug24° / 12°122.911.48.4
Sep26° / 14°486.711.97.4
Oct26° / 16°11712.112.46.3
Nov25° / 17°25619.912.94.9
Dec26° / 18°30921.613.14.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11387
21387
31387
41387
51387
61288
71387
81486
91486
101585
111783
121783
131882
141981
152179
162377
172377
182476
192575
202575
212674
222674
232773
242773
252773
262773
272773
282773
292773
302773
312773

Chance of precipitation in December

Any precipitation

Serro gets around 309 mm of rain over 21.6 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 69% and peaks near 75% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
173
274
374
474
575
675
775
874
974
1074
1173
1273
1372
1471
1570
1670
1769
1868
1967
2067
2166
2266
2365
2465
2564
2664
2764
2863
2963
3062
3162

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the humid band about 49% of days. Sticky, muggy-or-worse air turns up on roughly 45% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
195338
295140
385042
475043
564945
664846
754847
854748
954748
1054649
1144649
1254649
1354649
1454748
1554748
1654747
1754847
1854946
1964945
2065044
2165044
2265143
2375043
2475142
2585042
2685042
2794942
2894942
29104842
30104842
31104842

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 13 hours at the start of December to 13 h 06 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 6:12 AM to 6:24 AM, and sunset from 7:14 PM to 7:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:127:14
213.06:127:15
313.16:127:16
413.16:137:16
513.16:137:17
613.16:137:17
713.16:137:18
813.16:147:19
913.16:147:19
1013.16:147:20
1113.16:157:20
1213.16:157:21
1313.16:157:21
1413.16:167:22
1513.16:167:23
1613.16:167:23
1713.16:177:24
1813.16:177:24
1913.16:187:25
2013.16:187:25
2113.16:187:26
2213.16:197:26
2313.16:197:27
2413.16:207:27
2513.16:207:27
2613.16:217:28
2713.16:217:28
2813.16:227:29
2913.16:227:29
3013.16:237:29
3113.16:247:30

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.46 kWh/m².

For context, solar energy here swings from a low near 3.9 kWh/m² to a high of 6.01 kWh/m² in February across the year — December's 5.46 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.3Bright
125.3Bright
135.3Bright
145.4Bright
155.4Bright
165.5Bright
175.5Bright
185.6Bright
195.6Bright
205.6Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in December

Hazard calendar for Serro

In seasonPeak

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

Serro's monsoon runs November–March, 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 Serro?

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

4.7
Sightseeing
12th-best month of the year
4.6
Beach & pool
12th-best month of the year

December is a reasonable time to visit Serro for sightseeing.

What to pack for Serro in December

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

In December, Serro sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 22 days see rain.

rain gearlight clothessun protection

UV index in Serro 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 Serro peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 12UV 15Jun 22UV 7
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr11Extreme
May8Very high
Jun7Very high
Jul7Very high
Aug9Very high
Sep10Extreme
Oct12Extreme
Nov14Extreme
Dec14Extreme
Location & terrain

Where is Serro?

Serro sits at 18.6°S, 43.4°W, 821 m above sea level, in Brazil. The nearest listed city is Diamantina, 46 km away.

Topography around Serro

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

Within 3 km, the terrain around Serro has only modest variations in elevation — a maximum elevation change of 229 m around an average of 810 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 926 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,684 m.

The land around Serro is covered by trees (52%) and grassland (43%) within 3 km, trees (55%) and grassland (45%) within 16 km, and trees (50%) and grassland (46%) within 80 km.

3 km
229 m
16 km
926 m
80 km
1,684 m
treesshrubsgrasslandartificial surfaces
December weather nearby: Diamantina 46 km · Conceição do Mato Dentro 48 km · Guanhães 51 km · São João Evangelista 65 km · Peçanha 87 km · Itamarandiba 100 km · Jaboticatubas 108 km · Curvelo 112 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 Serro (-18.6047°, -43.3794°, elevation 821 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).