Promissão weather in December

In December, Promissão sees average daytime highs of 31°C and overnight lows near 22°C, with 187 mm of rain across 19.5 wet days and about 13.3 hours of daylight. It is the 4th-warmest and 2nd-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 18% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 h 12 min at the start of December to 13 h 18 min by month's end. Set against the rest of the year, December is Promissão's 11th-clearest and 8th-windiest month. For the whole year in context, see Promissão's year-round climate.

Daytime high
31°
4th warmest
Overnight low
22°
10th coldest
Rainfall
187 mm
19.5 wet days
Daylight
13 h 18 min
6:36 AM – 7:55 PM
Cloud cover
69%
11th clearest
Wind
9 km/h
8th windiest
Solar energy
5.99 kWh/m²
Travel score
3.6
out of 10

Promissão 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 Promissão reaches about 31°C in the afternoon and slips back to 22°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 34°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53122
63122
73122
83122
93122
103122
113122
123122
133122
143122
153122
163122
173122
183122
193122
203122
213122
223122
233122
243122
253122
263122
273122
283122
293122
303122
313022

How December really feels in Promissão

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.

Promissão weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°23621.713.23.4
Feb31° / 22°17018.112.73.6
Mar30° / 22°13316.712.24.1
Apr30° / 20°58711.55.7
May27° / 17°495.3117.3
Jun27° / 16°303.610.77.9
Jul27° / 15°202.910.88.0
Aug29° / 17°243.111.36.6
Sep31° / 19°576.911.95.2
Oct31° / 20°10211.112.54.2
Nov31° / 21°14014.2134.0
Dec31° / 22°18719.513.33.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23565
33565
43466
53367
63367
73268
83268
93268
103268
113367
123367
133466
143565
153664
163664
173763
183763
193862
203961
213862
223862
233763
243763
253664
263565
273466
283367
293268
303169
313070

Chance of precipitation in December

Any precipitation

Promissão gets around 187 mm of rain over 19.5 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 63% and peaks near 66% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
158
260
361
462
563
664
764
864
964
1064
1164
1264
1364
1463
1563
1663
1762
1862
1962
2061
2161
2261
2362
2462
2563
2663
2764
2864
2965
3065
3166

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 91% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
113173643
203163645
303153547
402143548
502133451
602123452
702113453
802113453
901103554
1001103554
110193654
120193654
130183754
140183853
150083953
160083953
170074053
180074053
190074053
200064054
210064054
220063955
230053956
240053857
250053758
260043660
270043561
280043363
290043264
300043165
310043165

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 12 min at the start of December to 13 h 18 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 6:33 AM to 6:44 AM, and sunset from 7:46 PM to 8:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:337:46
213.26:337:46
313.26:337:47
413.26:337:48
513.36:337:48
613.36:337:49
713.36:347:50
813.36:347:50
913.36:347:51
1013.36:347:51
1113.36:357:52
1213.36:357:53
1313.36:357:53
1413.36:367:54
1513.36:367:54
1613.36:367:55
1713.36:377:55
1813.36:377:56
1913.36:387:56
2013.36:387:57
2113.36:397:57
2213.36:397:58
2313.36:397:58
2413.36:407:59
2513.36:407:59
2613.36:418:00
2713.36:428:00
2813.36:428:00
2913.36:438:01
3013.36:438:01
3113.36:448:01

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.99 kWh/m².

For context, solar energy here swings from a low near 3.79 kWh/m² to a high of 6.18 kWh/m² in November across the year — December's 5.99 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.0Intense
46.0Intense
56.0Intense
66.0Bright
76.0Bright
86.0Bright
95.9Bright
105.9Bright
115.9Bright
126.0Bright
136.0Bright
146.0Bright
156.0Bright
166.0Bright
176.0Intense
186.0Intense
196.0Intense
206.0Intense
216.0Intense
226.0Intense
236.0Intense
246.0Intense
256.0Intense
266.0Bright
276.0Bright
285.9Bright
295.9Bright
305.9Bright
315.8Bright
Planning a trip in December

Hazard calendar for Promissão

In seasonPeak

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

Promissão'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 Promissão?

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

3.6
Sightseeing
10th-best month of the year
5.2
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Promissão.

What to pack for Promissão in December

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

In December, Promissão sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Promissão 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 Promissão peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 15Jul 10UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep9Very high
Oct11Extreme
Nov13Extreme
Dec13Extreme

Air quality in Promissão 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 Promissão is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1422 µg/m³Nov 238 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar9Good
Apr10Good
May11Good
Jun11Good
Jul11Good
Aug18Moderate
Sep22Moderate
Oct15Moderate
Nov8Good
Dec8Good
Location & terrain

Where is Promissão?

Promissão sits at 21.5°S, 49.9°W, 428 m above sea level, in Brazil. The nearest listed city is Lins, 20 km away.

Topography around Promissão

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

Within 3 km, the terrain around Promissão has only modest variations in elevation — a maximum elevation change of 73 m around an average of 416 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 155 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Promissão is covered by cropland (45%) and grassland (22%) within 3 km, cropland (69%) within 16 km, and cropland (57%) and grassland (20%) within 80 km.

3 km
73 m
16 km
155 m
80 km
375 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Lins 20 km · Penápolis 26 km · Cafelândia 39 km · Birigui 57 km · Buritama 60 km · Pirajuí 66 km · Novo Horizonte 66 km · Araçatuba 70 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 Promissão (-21.5367°, -49.8581°, elevation 428 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).