Montero weather in December

In December, Montero sees average daytime highs of 30°C and overnight lows near 23°C, with 239 mm of rain across 23.3 wet days and about 13 hours of daylight. It is the 3rd-warmest and 1st-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 7% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 13 hours at the start of December to 13 hours by month's end. Set against the rest of the year, December is Montero's 12th-clearest and 7th-windiest month. For the whole year in context, see Montero's year-round climate.

Daytime high
30°
3rd warmest
Overnight low
23°
11th coldest
Rainfall
239 mm
23.3 wet days
Daylight
13 hours
5:38 AM – 6:40 PM
Cloud cover
79%
12th clearest
Wind
11 km/h
7th windiest
Solar energy
5.3 kWh/m²
Travel score
3.2
out of 10

Montero is city in Bolivia.

Density
316/km²
people per km²
Founded
1854

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 Montero 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 33°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13122
23022
33022
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183123
193123
203123
213123
223123
233123
243123
253123
263123
273023
283023
293023
303023
313023

How December really feels in Montero

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.

Montero weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°23222.612.93.3
Feb30° / 23°20620.912.63.4
Mar30° / 22°15519.612.13.8
Apr29° / 21°961411.64.9
May26° / 18°821211.26.3
Jun25° / 17°619.9116.7
Jul26° / 16°466.611.17.4
Aug28° / 18°505.811.46.6
Sep30° / 20°968.411.95.0
Oct31° / 22°13714.612.44.0
Nov31° / 22°17217.112.83.7
Dec30° / 23°23923.3133.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 80%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22278
32080
42080
52080
61981
71981
81981
92080
101981
111981
121981
131981
142080
152080
162080
172179
182179
192179
202179
212179
222179
232179
242080
252080
261981
271981
281882
291882
301882
311981

Chance of precipitation in December

Any precipitation

Montero gets around 239 mm of rain over 23.3 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 74% and peaks near 80% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
168
269
370
470
571
671
771
871
971
1071
1171
1271
1372
1472
1573
1673
1773
1874
1975
2075
2176
2277
2378
2479
2579
2680
2780
2880
2980
3080
3180

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 75% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1015147010
2015147010
3015147010
401513729
501513729
601413739
701413739
801412749
901412749
10014127310
11014127310
12014127310
13113117410
14113117410
15113117410
16113107510
17112107511
18112107511
1911297611
2001297711
2101287811
2201287712
2301287712
2401177912
2501177912
2601168012
2700168112
2800168013
2900168013
3000167914
3100167914

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 11 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
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 hours at the start of December to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:34 AM to 5:45 AM, and sunset from 6:32 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:346:32
213.05:346:32
313.05:346:33
413.05:346:33
513.05:356:34
613.05:356:35
713.05:356:35
813.05:356:36
913.05:366:36
1013.05:366:37
1113.05:366:37
1213.05:376:38
1313.05:376:38
1413.05:376:39
1513.05:386:40
1613.05:386:40
1713.05:396:41
1813.05:396:41
1913.05:396:42
2013.05:406:42
2113.05:406:43
2213.05:416:43
2313.05:416:44
2413.05:426:44
2513.05:426:44
2613.05:436:45
2713.05:436:45
2813.05:446:46
2913.05:446:46
3013.05:456:46
3113.05:456:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.3 kWh/m².

For context, solar energy here swings from a low near 3.26 kWh/m² to a high of 5.42 kWh/m² in October across the year — December's 5.3 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in December

Hazard calendar for Montero

In seasonPeak

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

Montero'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 Montero?

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

3.2
Sightseeing
12th-best month of the year
4.6
Beach & pool
12th-best month of the year

December is a weaker month for outdoor sightseeing in Montero.

What to pack for Montero in December

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

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

light clothesrain gearsun protection

UV index in Montero 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 Montero peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 15 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 highExtremeJan 18UV 15Jul 15UV 7
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun7Very high
Jul7High
Aug8Very high
Sep9Very high
Oct8Very high
Nov13Extreme
Dec14Extreme

Air quality in Montero 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 Montero is worst in September — around 52 µg/m³ PM2.5 (poor), about 6.7× the cleanest month (May, 8 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 1749 µg/m³May 118 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar10Good
Apr8Good
May8Good
Jun10Good
Jul14Moderate
Aug29Moderate
Sep52Poor
Oct33Moderate
Nov17Moderate
Dec10Good
Location & terrain

Where is Montero?

Montero sits at 17.3°S, 63.3°W, 300 m above sea level, in Bolivia. The nearest listed city is Warnes, 22 km away.

Ascención de GuarayosMizqueSan Ignacio de Velasco

Topography around Montero

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

Within 3 km, the terrain around Montero has only modest variations in elevation — a maximum elevation change of 19 m around an average of 291 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 84 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,536 m.

The land around Montero is covered by artificial surfaces (52%) and trees (21%) within 3 km, grassland (44%), trees (26%) and cropland (23%) within 16 km, and trees (37%), cropland (34%) and grassland (25%) within 80 km.

3 km
19 m
16 km
84 m
80 km
1,536 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Warnes 22 km · Santa Cruz 50 km · Cotoca 57 km · Villa Yapacaní 62 km · El Torno 75 km · Ascención de Guarayos 161 km · Mizque 231 km · San Ignacio de Velasco 266 km

Bolivia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 40% of US
price level, 2025
GDP per capita
$5,148
2025
Happiness
5.8 / 10
World Happiness, 2025
Homicide rate
4.4
per 100k, 2023
Road deaths
21.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 521
Religion
Roman Catholic 65%Protestant 20%none 6%other 5%

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 Montero (-17.3387°, -63.2509°, elevation 300 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).