La Unión weather in December

In December, La Unión sees average daytime highs of 15°C and overnight lows near 13°C, with 30 mm of rain across 4.7 wet days and about 9.4 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 15°C through the month. The sky is clear or mostly clear about 50% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 36 min at the start of December to 9 h 24 min by month's end. Set against the rest of the year, December is La Unión's 12th-clearest and 4th-windiest month. For the whole year in context, see La Unión's year-round climate.

Daytime high: 15°; 9th warmest
Overnight low: 13°; 4th coldest
Rainfall: 30 mm; 4.7 wet days
Daylight: 9 h 24 min; 8:17 AM – 5:42 PM
Cloud cover: 43%; 12th clearest
Wind: 18 km/h; 4th windiest
Solar energy: 2.37 kWh/m²
Travel score: 5.5; out of 10

La Unión is municipal capital of the homonymous municipality of Campo de Cartagena, Spain.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← 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 15°C through the month.

A typical December day in La Unión reaches about 15°C in the afternoon and slips back to 13°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 17°C. Set against its neighbours, December runs about 2°C cooler than November and about 1°C warmer than 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)	16	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15
Avg low (°C)	14	14	14	14	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13

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

La Unión weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	14° / 12°	35	4.6	9.7	5.0
Feb	14° / 12°	23	3.9	10.5	5.0
Mar	15° / 13°	29	4.3	11.7	5.5
Apr	17° / 15°	22	3.2	12.9	6.4
May	19° / 17°	16	2	14	7.7
Jun	22° / 21°	5	0.8	14.5	8.9
Jul	25° / 23°	1	0.1	14.3	9.4
Aug	26° / 24°	6	1.3	13.4	8.9
Sep	24° / 22°	33	3.5	12.3	8.4
Oct	21° / 19°	36	4.3	11	7.7
Nov	18° / 16°	39	5.8	10	6.6
Dec	15° / 13°	30	4.7	9.4	5.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 34%.

	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 (%)	67	67	67	67	67	67	67	67	67	67	66	65	65	65	65	64	64	64	64	64	64	65	65	65	66	66	67	67	68	69	69
Cloudier (%)	33	33	33	33	33	33	33	33	33	33	34	35	35	35	35	36	36	36	36	36	36	35	35	35	34	34	33	33	32	31	31

	Clearer (%)	Cloudier (%)
1	67	33
2	67	33
3	67	33
4	67	33
5	67	33
6	67	33
7	67	33
8	67	33
9	67	33
10	67	33
11	66	34
12	65	35
13	65	35
14	65	35
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	64	36
21	64	36
22	65	35
23	65	35
24	65	35
25	66	34
26	66	34
27	67	33
28	67	33
29	68	32
30	69	31
31	69	31

Chance of precipitation in December

Any precipitation

La Unión gets around 30 mm of rain over 4.7 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 15% and peaks near 19% 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 (%)	19	18	18	18	17	17	17	17	16	16	16	16	16	16	16	16	16	16	16	15	15	15	14	14	13	13	13	12	12	12	12

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

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

	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
Dry (%)	76	77	78	78	79	80	81	81	82	83	83	84	84	84	85	85	85	86	86	86	87	87	88	88	89	89	90	90	91	91	92
Comfortable (%)	24	23	22	22	21	20	19	19	18	17	17	16	16	16	15	15	15	14	14	14	13	13	12	12	11	11	10	10	9	9	8

	Dry (%)	Comfortable (%)
1	76	24
2	77	23
3	78	22
4	78	22
5	79	21
6	80	20
7	81	19
8	81	19
9	82	18
10	83	17
11	83	17
12	84	16
13	84	16
14	84	16
15	85	15
16	85	15
17	85	15
18	86	14
19	86	14
20	86	14
21	87	13
22	87	13
23	88	12
24	88	12
25	89	11
26	89	11
27	90	10
28	90	10
29	91	9
30	91	9
31	92	8

Wind in December

Winds average 18 km/h in December.

Across December, daily wind ranges from about 18 km/h on the calmest days to 18 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)	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
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 36 min at the start of December to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 8:06 AM to 8:24 AM, and sunset from 5:41 PM to 5:50 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)	9.6	9.6	9.6	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.5	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4
Sunrise (AM)	8:06	8:06	8:07	8:08	8:09	8:10	8:11	8:12	8:12	8:13	8:14	8:15	8:15	8:16	8:17	8:17	8:18	8:18	8:19	8:20	8:20	8:21	8:21	8:21	8:22	8:22	8:23	8:23	8:23	8:23	8:24
Sunset (PM)	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:41	5:42	5:42	5:42	5:42	5:43	5:43	5:44	5:44	5:44	5:45	5:45	5:46	5:47	5:47	5:48	5:48	5:49	5:50

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.6	8:06	5:41
2	9.6	8:06	5:41
3	9.6	8:07	5:41
4	9.5	8:08	5:41
5	9.5	8:09	5:41
6	9.5	8:10	5:41
7	9.5	8:11	5:41
8	9.5	8:12	5:41
9	9.5	8:12	5:41
10	9.5	8:13	5:41
11	9.5	8:14	5:41
12	9.4	8:15	5:41
13	9.4	8:15	5:41
14	9.4	8:16	5:42
15	9.4	8:17	5:42
16	9.4	8:17	5:42
17	9.4	8:18	5:42
18	9.4	8:18	5:43
19	9.4	8:19	5:43
20	9.4	8:20	5:44
21	9.4	8:20	5:44
22	9.4	8:21	5:44
23	9.4	8:21	5:45
24	9.4	8:21	5:45
25	9.4	8:22	5:46
26	9.4	8:22	5:47
27	9.4	8:23	5:47
28	9.4	8:23	5:48
29	9.4	8:23	5:48
30	9.4	8:23	5:49
31	9.4	8:24	5:50

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.37 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 7.67 kWh/m² in June across the year — December's 2.37 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)	2.5	2.5	2.5	2.5	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.4	2.5	2.5
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	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.5	Moderate
2	2.5	Moderate
3	2.5	Moderate
4	2.5	Moderate
5	2.4	Moderate
6	2.4	Moderate
7	2.4	Moderate
8	2.4	Moderate
9	2.4	Moderate
10	2.4	Moderate
11	2.4	Moderate
12	2.4	Moderate
13	2.4	Moderate
14	2.4	Moderate
15	2.4	Moderate
16	2.4	Moderate
17	2.4	Moderate
18	2.4	Moderate
19	2.4	Moderate
20	2.4	Moderate
21	2.4	Moderate
22	2.4	Moderate
23	2.4	Moderate
24	2.4	Moderate
25	2.4	Moderate
26	2.4	Moderate
27	2.4	Moderate
28	2.4	Moderate
29	2.4	Moderate
30	2.5	Moderate
31	2.5	Moderate

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).

5.5

Sightseeing

9th-best month of the year

0.3

Beach & pool

9th-best month of the year

December is a reasonable time to visit La Unión for sightseeing.

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 15°C and nights near 13°C. Worth packing: a warm layer. About 5 days see rain.

a warm layer

Sea temperature near La Unión in December

The nearest coast averages about 16°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 km away) is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 2 to Nov 4 — about 5.1 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	15	14	15	16	18	22	24	26	25	22	19	16
Comfort	Cool	Bracing	Bracing	Cool	Cool	Refreshing	Warm	Warm	Warm	Refreshing	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	15	Cool
Feb	14	Bracing
Mar	15	Bracing
Apr	16	Cool
May	18	Cool
Jun	22	Refreshing
Jul	24	Warm
Aug	26	Warm
Sep	25	Warm
Oct	22	Refreshing
Nov	19	Cool
Dec	16	Cool

UV index in La Unión in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in La Unión peaks around July 14 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	2	3	6	7	7	9	10	7	7	5	3	2
Level	Moderate	Moderate	High	Very high	Very high	Very high	Very high	Very high	High	Moderate	Moderate	Low

	UV index (midday)	Level
Jan	2	Moderate
Feb	3	Moderate
Mar	6	High
Apr	7	Very high
May	7	Very high
Jun	9	Very high
Jul	10	Very high
Aug	7	Very high
Sep	7	High
Oct	5	Moderate
Nov	3	Moderate
Dec	2	Low

Location & terrain

Where is La Unión?

La Unión sits at 37.6°N, 0.9°W, 104 m above sea level, in Spain. The nearest listed city is Atamaría, 7.0 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 346 m around an average of 136 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 481 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,554 m.

The land around La Unión is covered by grassland (33%) within 3 km, water (48%) and cropland (21%) within 16 km, and water (45%) and grassland (20%) within 80 km.

3 km

346 m

grassland 33%

16 km

481 m

water 48%

80 km

1,554 m

water 45%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

December weather nearby: Atamaría 7.0 km · Cartagena 10 km · Barrio de Peral 10 km · Los Alcázares 14 km · Torre-Pacheco 15 km · San Javier 21 km · San Pedro del Pinatar 25 km · Pilar de la Horadada 28 km

Spain travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 65% of US; price level, 2025
GDP per capita: $38,627; 2025
Happiness: 6.5 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 0.7; per 100k, 2023
Road deaths: 3.9; per 100k/yr, 2019
Income group: High; World Bank
English: Moderate; EF EPI 540
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 (37.6191°, -0.878°, elevation 104 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).

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

	Clearer (%)	Cloudier (%)
1	67	33
2	67	33
3	67	33
4	67	33
5	67	33
6	67	33
7	67	33
8	67	33
9	67	33
10	67	33
11	66	34
12	65	35
13	65	35
14	65	35
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	64	36
21	64	36
22	65	35
23	65	35
24	65	35
25	66	34
26	66	34
27	67	33
28	67	33
29	68	32
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	76	24
2	77	23
3	78	22
4	78	22
5	79	21
6	80	20
7	81	19
8	81	19
9	82	18
10	83	17
11	83	17
12	84	16
13	84	16
14	84	16
15	85	15
16	85	15
17	85	15
18	86	14
19	86	14
20	86	14
21	87	13
22	87	13
23	88	12
24	88	12
25	89	11
26	89	11
27	90	10
28	90	10
29	91	9
30	91	9
31	92	8

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

	Clearer (%)	Cloudier (%)
1	67	33
2	67	33
3	67	33
4	67	33
5	67	33
6	67	33
7	67	33
8	67	33
9	67	33
10	67	33
11	66	34
12	65	35
13	65	35
14	65	35
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	64	36
21	64	36
22	65	35
23	65	35
24	65	35
25	66	34
26	66	34
27	67	33
28	67	33
29	68	32
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	76	24
2	77	23
3	78	22
4	78	22
5	79	21
6	80	20
7	81	19
8	81	19
9	82	18
10	83	17
11	83	17
12	84	16
13	84	16
14	84	16
15	85	15
16	85	15
17	85	15
18	86	14
19	86	14
20	86	14
21	87	13
22	87	13
23	88	12
24	88	12
25	89	11
26	89	11
27	90	10
28	90	10
29	91	9
30	91	9
31	92	8

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

	Clearer (%)	Cloudier (%)
1	67	33
2	67	33
3	67	33
4	67	33
5	67	33
6	67	33
7	67	33
8	67	33
9	67	33
10	67	33
11	66	34
12	65	35
13	65	35
14	65	35
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	64	36
21	64	36
22	65	35
23	65	35
24	65	35
25	66	34
26	66	34
27	67	33
28	67	33
29	68	32
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	76	24
2	77	23
3	78	22
4	78	22
5	79	21
6	80	20
7	81	19
8	81	19
9	82	18
10	83	17
11	83	17
12	84	16
13	84	16
14	84	16
15	85	15
16	85	15
17	85	15
18	86	14
19	86	14
20	86	14
21	87	13
22	87	13
23	88	12
24	88	12
25	89	11
26	89	11
27	90	10
28	90	10
29	91	9
30	91	9
31	92	8