La Unión weather in December

In December, La Unión sees average daytime highs of 26°C and overnight lows near 18°C, with 439 mm of rain across 30.3 wet days and about 11.7 hours of daylight. It is the 7th-warmest and 10th-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 1% of the time in December, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of December to 11 h 42 min by month's end. Set against the rest of the year, December is La Unión's 3rd-clearest and 10th-windiest month. For the whole year in context, see La Unión's year-round climate.

Daytime high: 26°; 7th warmest
Overnight low: 18°; 7th coldest
Rainfall: 439 mm; 30.3 wet days
Daylight: 11 h 42 min; 6:08 AM – 5:53 PM
Cloud cover: 85%; 3rd clearest
Wind: 3 km/h; 10th windiest
Solar energy: 3.73 kWh/m²
Travel score: 3.5; out of 10

← November La Unión year-round climate January →Best places to visit in December

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 La Unión 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 27°C. Set against its neighbours, December runs on par with November and on par with January.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	26	26	26	26	26	26	26	26	26	26	26	26	26
Avg low (°C)	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18

	Avg high (°C)	Avg low (°C)
1	25	18
2	25	18
3	25	18
4	25	18
5	25	18
6	25	18
7	25	18
8	25	18
9	25	18
10	25	18
11	25	18
12	25	18
13	25	18
14	25	18
15	25	18
16	25	18
17	25	18
18	25	18
19	26	18
20	26	18
21	26	18
22	26	18
23	26	18
24	26	18
25	26	18
26	26	18
27	26	18
28	26	18
29	26	18
30	26	18
31	26	18

La Unión weather by month

How December compares with the rest of the year at a glance. December is the 7th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	26° / 18°	348	29.3	11.8	3.7
Feb	26° / 18°	388	26.6	11.9	3.6
Mar	26° / 18°	508	30	12	3.5
Apr	26° / 18°	670	29.5	12.1	3.4
May	26° / 18°	697	30.7	12.2	3.3
Jun	26° / 18°	552	29.7	12.3	3.4
Jul	26° / 18°	475	30.2	12.2	3.4
Aug	26° / 18°	449	30.1	12.1	3.4
Sep	26° / 18°	567	29.2	12	3.4
Oct	25° / 18°	609	30.3	11.9	3.4
Nov	25° / 18°	587	29.2	11.8	3.5
Dec	26° / 18°	439	30.3	11.7	3.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 6% of December, with mostly cloudy or overcast conditions the remaining 92%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	2	2	2	2	3	3	4	4	5	5	5	6	6	6	7	7	8	8	8	9	10	11	11	11	11	12	13	13	13	14	14
Cloudier (%)	98	98	98	98	97	97	96	96	95	95	95	94	94	94	93	93	92	92	92	91	90	89	89	89	89	88	87	87	87	86	86

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	3	97
6	3	97
7	4	96
8	4	96
9	5	95
10	5	95
11	5	95
12	6	94
13	6	94
14	6	94
15	7	93
16	7	93
17	8	92
18	8	92
19	8	92
20	9	91
21	10	90
22	11	89
23	11	89
24	11	89
25	11	89
26	12	88
27	13	87
28	13	87
29	13	87
30	14	86
31	14	86

Chance of precipitation in December

Any precipitation

La Unión gets around 439 mm of rain over 30.3 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 98% and peaks near 99% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	98	98	98	99	99	99	99	99	99	99	99	99	99	99	99	98	98	98	98	98	97	97	97	96	96	96	95	95	95	94	94

	Rain chance (%)
1	98
2	98
3	98
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	98
17	98
18	98
19	98
20	98
21	97
22	97
23	97
24	96
25	96
26	96
27	95
28	95
29	95
30	94
31	94

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Humid (%)	8	8	8	7	7	7	7	7	7	7	6	6	7	7	7	7	7	7	8	8	8	9	9	9	10	10	10	11	11	11	12
Muggy (%)	92	92	92	93	93	93	93	93	93	93	94	94	93	93	93	93	93	93	91	91	91	90	90	90	89	89	89	88	89	89	88
Oppressive (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	0	0	0

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	92	0
2	8	92	0
3	8	92	0
4	7	93	0
5	7	93	0
6	7	93	0
7	7	93	0
8	7	93	0
9	7	93	0
10	7	93	0
11	6	94	0
12	6	94	0
13	7	93	0
14	7	93	0
15	7	93	0
16	7	93	0
17	7	93	0
18	7	93	0
19	8	91	1
20	8	91	1
21	8	91	1
22	9	90	1
23	9	90	1
24	9	90	1
25	10	89	1
26	10	89	1
27	10	89	1
28	11	88	1
29	11	89	0
30	11	89	0
31	12	88	0

Wind in December

Winds average 3 km/h in December.

Across December, daily wind ranges from about 2 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	2	2	2	2	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	2	calm
2	2	calm
3	2	calm
4	2	calm
5	3	calm
6	3	calm
7	3	calm
8	3	calm
9	3	calm
10	3	calm
11	3	calm
12	3	calm
13	3	calm
14	3	calm
15	3	calm
16	3	calm
17	3	calm
18	3	calm
19	3	calm
20	3	calm
21	3	calm
22	3	calm
23	3	calm
24	3	calm
25	3	calm
26	3	calm
27	3	calm
28	3	calm
29	3	calm
30	3	calm
31	3	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 48 min at the start of December to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:01 AM to 6:15 AM, and sunset from 5:47 PM to 6:00 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.8	11.8	11.8	11.8	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7	11.7
Sunrise (AM)	6:01	6:02	6:02	6:03	6:03	6:04	6:04	6:05	6:05	6:06	6:06	6:06	6:07	6:07	6:08	6:08	6:09	6:09	6:10	6:10	6:11	6:11	6:12	6:12	6:13	6:13	6:14	6:14	6:14	6:15	6:15
Sunset (PM)	5:47	5:47	5:48	5:48	5:48	5:49	5:49	5:49	5:50	5:50	5:51	5:51	5:51	5:52	5:52	5:53	5:53	5:54	5:54	5:55	5:55	5:56	5:56	5:56	5:57	5:57	5:58	5:58	5:59	5:59	6:00

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.8	6:01	5:47
2	11.8	6:02	5:47
3	11.8	6:02	5:48
4	11.8	6:03	5:48
5	11.7	6:03	5:48
6	11.7	6:04	5:49
7	11.7	6:04	5:49
8	11.7	6:05	5:49
9	11.7	6:05	5:50
10	11.7	6:06	5:50
11	11.7	6:06	5:51
12	11.7	6:06	5:51
13	11.7	6:07	5:51
14	11.7	6:07	5:52
15	11.7	6:08	5:52
16	11.7	6:08	5:53
17	11.7	6:09	5:53
18	11.7	6:09	5:54
19	11.7	6:10	5:54
20	11.7	6:10	5:55
21	11.7	6:11	5:55
22	11.7	6:11	5:56
23	11.7	6:12	5:56
24	11.7	6:12	5:56
25	11.7	6:13	5:57
26	11.7	6:13	5:57
27	11.7	6:14	5:58
28	11.7	6:14	5:58
29	11.7	6:14	5:59
30	11.7	6:15	5:59
31	11.7	6:15	6:00

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.73 kWh/m².

For context, solar energy here swings from a low near 3.49 kWh/m² to a high of 4.54 kWh/m² in August across the year — December's 3.73 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	3.5	3.5	3.5	3.5	3.5	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.7	3.7	3.7	3.7	3.8	3.8	3.8	3.9	3.9	3.9	3.9	4.0	4.0	4.0	4.0	4.0
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.5	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.6	Moderate
7	3.6	Moderate
8	3.6	Moderate
9	3.6	Moderate
10	3.6	Moderate
11	3.6	Moderate
12	3.6	Moderate
13	3.6	Moderate
14	3.6	Moderate
15	3.6	Moderate
16	3.7	Moderate
17	3.7	Moderate
18	3.7	Moderate
19	3.7	Moderate
20	3.8	Moderate
21	3.8	Moderate
22	3.8	Moderate
23	3.9	Moderate
24	3.9	Moderate
25	3.9	Moderate
26	3.9	Moderate
27	4.0	Moderate
28	4.0	Moderate
29	4.0	Bright
30	4.0	Bright
31	4.0	Bright

Planning a trip in December

Is December a good time to visit La Unión?

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

3.5

Sightseeing

3rd-best month of the year

3.3

Beach & pool

5th-best month of the year

December is a weaker month for outdoor sightseeing in La Unión.

What to pack for La Unión in December

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

In December, La Unión sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 30 days see rain.

rain gearlight clothes

UV index in La Unión in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in La Unión peaks around February 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 11 (extreme).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	15	15	11	14	12	13	12	14	14	12	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	15	Extreme
Mar	15	Extreme
Apr	11	Extreme
May	14	Extreme
Jun	12	Extreme
Jul	13	Extreme
Aug	12	Extreme
Sep	14	Extreme
Oct	14	Extreme
Nov	12	Extreme
Dec	11	Extreme

Air quality in La Unión 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 La Unión is worst in March — around 35 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 19 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	28	32	35	30	24	21	19	22	25	23	22	26
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	28	Moderate
Feb	32	Moderate
Mar	35	Moderate
Apr	30	Moderate
May	24	Moderate
Jun	21	Moderate
Jul	19	Moderate
Aug	22	Moderate
Sep	25	Moderate
Oct	23	Moderate
Nov	22	Moderate
Dec	26	Moderate

Location & terrain

Where is La Unión?

La Unión sits at 4.5°N, 76.1°W, 967 m above sea level, in Colombia. The nearest listed city is Roldanillo, 15 km away.

Topography around La Unión

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

Within 3 km, the terrain around La Unión has significant variations in elevation — a maximum elevation change of 504 m around an average of 1,031 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,272 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,598 m.

The land around La Unión is covered by grassland (62%) and trees (28%) within 3 km, grassland (50%) and trees (31%) within 16 km, and trees (74%) and grassland (23%) within 80 km.

3 km

504 m

grassland 62%

16 km

1,272 m

grassland 50%

80 km

4,598 m

trees 74%

treesgrasslandcroplandartificial surfaceswater

← November La Unión year-round climate January →Best places to visit in December

December weather nearby: Roldanillo 15 km · Zarzal 16 km · Cartago 32 km · Sevilla 35 km · La Tebaida 36 km · Caicedonia 38 km · Quimbaya 39 km · Montenegro 39 km

Colombia travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type A / B; 120 / 240 V · 60 Hz
Prices: ≈ 38% of US; price level, 2025
GDP per capita: $8,562; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 74%; of population, 2024
Homicide rate: 24.9; per 100k, 2023
Road deaths: 15.4; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 480
Religion

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 La Unión (4.5328°, -76.1032°, elevation 967 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).

	Avg high (°C)	Avg low (°C)
1	25	18
2	25	18
3	25	18
4	25	18
5	25	18
6	25	18
7	25	18
8	25	18
9	25	18
10	25	18
11	25	18
12	25	18
13	25	18
14	25	18
15	25	18
16	25	18
17	25	18
18	25	18
19	26	18
20	26	18
21	26	18
22	26	18
23	26	18
24	26	18
25	26	18
26	26	18
27	26	18
28	26	18
29	26	18
30	26	18
31	26	18

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	3	97
6	3	97
7	4	96
8	4	96
9	5	95
10	5	95
11	5	95
12	6	94
13	6	94
14	6	94
15	7	93
16	7	93
17	8	92
18	8	92
19	8	92
20	9	91
21	10	90
22	11	89
23	11	89
24	11	89
25	11	89
26	12	88
27	13	87
28	13	87
29	13	87
30	14	86
31	14	86

	Rain chance (%)
1	98
2	98
3	98
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	98
17	98
18	98
19	98
20	98
21	97
22	97
23	97
24	96
25	96
26	96
27	95
28	95
29	95
30	94
31	94

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	92	0
2	8	92	0
3	8	92	0
4	7	93	0
5	7	93	0
6	7	93	0
7	7	93	0
8	7	93	0
9	7	93	0
10	7	93	0
11	6	94	0
12	6	94	0
13	7	93	0
14	7	93	0
15	7	93	0
16	7	93	0
17	7	93	0
18	7	93	0
19	8	91	1
20	8	91	1
21	8	91	1
22	9	90	1
23	9	90	1
24	9	90	1
25	10	89	1
26	10	89	1
27	10	89	1
28	11	88	1
29	11	89	0
30	11	89	0
31	12	88	0

	Avg high (°C)	Avg low (°C)
1	25	18
2	25	18
3	25	18
4	25	18
5	25	18
6	25	18
7	25	18
8	25	18
9	25	18
10	25	18
11	25	18
12	25	18
13	25	18
14	25	18
15	25	18
16	25	18
17	25	18
18	25	18
19	26	18
20	26	18
21	26	18
22	26	18
23	26	18
24	26	18
25	26	18
26	26	18
27	26	18
28	26	18
29	26	18
30	26	18
31	26	18

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	3	97
6	3	97
7	4	96
8	4	96
9	5	95
10	5	95
11	5	95
12	6	94
13	6	94
14	6	94
15	7	93
16	7	93
17	8	92
18	8	92
19	8	92
20	9	91
21	10	90
22	11	89
23	11	89
24	11	89
25	11	89
26	12	88
27	13	87
28	13	87
29	13	87
30	14	86
31	14	86

	Rain chance (%)
1	98
2	98
3	98
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	98
17	98
18	98
19	98
20	98
21	97
22	97
23	97
24	96
25	96
26	96
27	95
28	95
29	95
30	94
31	94

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	92	0
2	8	92	0
3	8	92	0
4	7	93	0
5	7	93	0
6	7	93	0
7	7	93	0
8	7	93	0
9	7	93	0
10	7	93	0
11	6	94	0
12	6	94	0
13	7	93	0
14	7	93	0
15	7	93	0
16	7	93	0
17	7	93	0
18	7	93	0
19	8	91	1
20	8	91	1
21	8	91	1
22	9	90	1
23	9	90	1
24	9	90	1
25	10	89	1
26	10	89	1
27	10	89	1
28	11	88	1
29	11	89	0
30	11	89	0
31	12	88	0

	Avg high (°C)	Avg low (°C)
1	25	18
2	25	18
3	25	18
4	25	18
5	25	18
6	25	18
7	25	18
8	25	18
9	25	18
10	25	18
11	25	18
12	25	18
13	25	18
14	25	18
15	25	18
16	25	18
17	25	18
18	25	18
19	26	18
20	26	18
21	26	18
22	26	18
23	26	18
24	26	18
25	26	18
26	26	18
27	26	18
28	26	18
29	26	18
30	26	18
31	26	18

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	3	97
6	3	97
7	4	96
8	4	96
9	5	95
10	5	95
11	5	95
12	6	94
13	6	94
14	6	94
15	7	93
16	7	93
17	8	92
18	8	92
19	8	92
20	9	91
21	10	90
22	11	89
23	11	89
24	11	89
25	11	89
26	12	88
27	13	87
28	13	87
29	13	87
30	14	86
31	14	86

	Rain chance (%)
1	98
2	98
3	98
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	98
17	98
18	98
19	98
20	98
21	97
22	97
23	97
24	96
25	96
26	96
27	95
28	95
29	95
30	94
31	94

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	92	0
2	8	92	0
3	8	92	0
4	7	93	0
5	7	93	0
6	7	93	0
7	7	93	0
8	7	93	0
9	7	93	0
10	7	93	0
11	6	94	0
12	6	94	0
13	7	93	0
14	7	93	0
15	7	93	0
16	7	93	0
17	7	93	0
18	7	93	0
19	8	91	1
20	8	91	1
21	8	91	1
22	9	90	1
23	9	90	1
24	9	90	1
25	10	89	1
26	10	89	1
27	10	89	1
28	11	88	1
29	11	89	0
30	11	89	0
31	12	88	0