Cajamar weather in December

In December, Cajamar sees average daytime highs of 28°C and overnight lows near 19°C, with 189 mm of rain across 19.9 wet days and about 13.4 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 17% of the time in December, and the air most often feels muggy.

Daylight stretches from about 13 h 18 min at the start of December to 13 h 24 min by month's end. Set against the rest of the year, December is Cajamar's 11th-clearest and 5th-windiest month. For the whole year in context, see Cajamar's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
189 mm
19.9 wet days
Daylight
13 h 24 min
6:21 AM – 7:47 PM
Cloud cover
70%
11th clearest
Wind
11 km/h
5th windiest
Solar energy
5.84 kWh/m²
Travel score
4.9
out of 10

Cajamar 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 28°C through the month.

A typical December day in Cajamar reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 31°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12718
22718
32718
42718
52718
62718
72719
82719
92719
102719
112819
122819
132819
142819
152819
162819
172819
182819
192819
202819
212819
222819
232819
242819
252819
262819
272819
282819
292819
302819
312819

Cajamar weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°24322.213.34.4
Feb28° / 19°16918.912.84.4
Mar28° / 19°13517.712.25.3
Apr26° / 17°648.811.56.9
May24° / 14°646.810.97.5
Jun23° / 13°495.210.67.8
Jul23° / 12°464.710.78.0
Aug25° / 13°374.511.28.1
Sep26° / 15°868.911.97.0
Oct27° / 17°11813.112.56.0
Nov27° / 18°15015.713.15.5
Dec28° / 19°18919.913.44.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13664
23664
33565
43466
53466
63367
73268
83268
93268
103367
113268
123268
133268
143268
153367
163466
173466
183466
193565
203565
213664
223664
233565
243565
253466
263367
273367
283169
293070
303070
312971

Chance of precipitation in December

Any precipitation

Cajamar gets around 189 mm of rain over 19.9 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 64% and peaks near 68% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
156
257
358
459
559
660
761
861
962
1063
1163
1264
1365
1465
1566
1666
1766
1867
1967
2067
2167
2267
2367
2467
2567
2667
2767
2868
2968
3068
3168

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 60% of days. Sticky, muggy-or-worse air turns up on roughly 62% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
111339461
211338471
311237481
411236502
511135512
611134522
711133532
811032552
911031562
1011031562
111930582
120930592
130930592
140830602
150830602
160830602
170729622
180729622
190729622
200629632
210628642
220528643
230527653
240427654
250426664
260425674
270425665
280324685
290324685
300323686
310323686

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 18 min at the start of December to 13 h 24 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 6:17 AM to 6:28 AM, and sunset from 7:37 PM to 7:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:177:37
213.36:177:38
313.46:177:39
413.46:187:39
513.46:187:40
613.46:187:41
713.46:187:41
813.46:187:42
913.46:197:42
1013.46:197:43
1113.46:197:44
1213.46:197:44
1313.46:207:45
1413.46:207:45
1513.46:207:46
1613.46:217:47
1713.46:217:47
1813.46:227:48
1913.46:227:48
2013.46:227:49
2113.46:237:49
2213.46:237:50
2313.46:247:50
2413.46:247:51
2513.46:257:51
2613.46:257:51
2713.46:267:52
2813.46:267:52
2913.46:277:53
3013.46:287:53
3113.46:287:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.84 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.51 kWh/m² to a high of 5.84 kWh/m² in December across the year — December's 5.84 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in December

Hazard calendar for Cajamar

In seasonPeak

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

Cajamar's rainy season runs October–March, 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 Cajamar?

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

4.9
Sightseeing
10th-best month of the year
5.1
Beach & pool
10th-best month of the year

December is a reasonable time to visit Cajamar for sightseeing.

What to pack for Cajamar in December

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

In December, Cajamar sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Cajamar 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 Cajamar peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (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 12UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep8Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Cajamar 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 Cajamar is worst in July — around 38 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (January, 18 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 1838 µg/m³Jan 1018 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb20Moderate
Mar22Moderate
Apr26Moderate
May31Moderate
Jun35Poor
Jul38Poor
Aug36Poor
Sep35Poor
Oct25Moderate
Nov18Moderate
Dec18Moderate
Location & terrain

Where is Cajamar?

Cajamar sits at 23.4°S, 46.9°W, 735 m above sea level, in Brazil. The nearest listed city is Santana de Parnaíba, 11 km away.

Topography around Cajamar

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

Within 3 km, the terrain around Cajamar has significant variations in elevation — a maximum elevation change of 384 m around an average of 798 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 655 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,679 m.

The land around Cajamar is covered by trees (73%) within 3 km, trees (70%) within 16 km, and trees (54%) and grassland (20%) within 80 km.

3 km
384 m
16 km
655 m
80 km
1,679 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Santana de Parnaíba 11 km · Anhanguera 12 km · Pirapora do Bom Jesus 14 km · Perus 14 km · Caieiras 14 km · Francisco Morato 16 km · Franco da Rocha 16 km · Várzea Paulista 17 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 Cajamar (-23.3561°, -46.8769°, elevation 735 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).