Somerton weather in December

In December, Somerton sees average daytime highs of 69°F and overnight lows near 48°F, with 0.4 in of rain across 1.7 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 71°F in the first days to 68°F by the end. The sky is clear or mostly clear about 64% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Somerton's 10th-clearest and 7th-windiest month. For the whole year in context, see Somerton's year-round climate.

Daytime high: 69°; 12th warmest
Overnight low: 48°; 1st coldest
Rainfall: 0.4 in; 1.7 wet days
Daylight: 9 h 54 min; 7:39 AM – 5:31 PM
Cloud cover: 32%; 10th clearest
Wind: 6 mph; 7th windiest
Solar energy: 3.4 kWh/m²
Travel score: 8.2; out of 10

Somerton is city in Yuma County, Arizona, United States.

Density: 782/km²; people per km²
Founded: 1898

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

← November Somerton 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

Highs ease over the month, from about 71°F in the first days to 68°F by the end.

A typical December day in Somerton reaches about 69°F in the afternoon and slips back to 48°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 76°F. Set against its neighbours, December runs about 9°F cooler than November and about 2°F cooler 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 (°F)	72	72	71	71	71	71	71	70	70	70	70	69	69	69	69	69	69	68	68	68	68	68	68	68	68	68	68	68	68	68	68
Avg low (°F)	51	50	50	50	50	49	49	49	49	49	49	49	48	48	48	48	48	48	47	47	47	47	47	47	47	47	47	47	47	47	47

	Avg high (°F)	Avg low (°F)
1	72	51
2	72	50
3	71	50
4	71	50
5	71	50
6	71	49
7	71	49
8	70	49
9	70	49
10	70	49
11	70	49
12	69	49
13	69	48
14	69	48
15	69	48
16	69	48
17	69	48
18	68	48
19	68	47
20	68	47
21	68	47
22	68	47
23	68	47
24	68	47
25	68	47
26	68	47
27	68	47
28	68	47
29	68	47
30	68	47
31	68	47

How December really feels in Somerton

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Somerton weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	71° / 49°	0.4	1.5	10.1	8.4
Feb	74° / 52°	0.5	2.3	10.8	8.6
Mar	81° / 56°	0.4	1.5	11.8	8.1
Apr	87° / 61°	0.1	0.6	12.8	6.1
May	95° / 68°	0.0	0.2	13.7	3.5
Jun	103° / 75°	0.0	0.2	14.1	0.7
Jul	106° / 83°	0.2	1.5	13.9	0.0
Aug	106° / 84°	0.4	2.9	13.2	0.0
Sep	101° / 78°	0.5	2.2	12.2	1.2
Oct	91° / 67°	0.2	0.9	11.2	4.9
Nov	78° / 56°	0.2	0.8	10.3	8.6
Dec	69° / 48°	0.4	1.7	9.9	8.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 64% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 25%.

	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 (%)	76	76	76	76	75	75	75	75	75	75	75	76	76	76	75	75	75	75	75	74	74	74	74	74	73	73	73	73	73	73	73
Cloudier (%)	24	24	24	24	25	25	25	25	25	25	25	24	24	24	25	25	25	25	25	26	26	26	26	26	27	27	27	27	27	27	27

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	75	25
8	75	25
9	75	25
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	75	25
16	75	25
17	75	25
18	75	25
19	75	25
20	74	26
21	74	26
22	74	26
23	74	26
24	74	26
25	73	27
26	73	27
27	73	27
28	73	27
29	73	27
30	73	27
31	73	27

Chance of precipitation in December

Any precipitation

Somerton gets around 0.4 in of rain over 1.7 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 5% and peaks near 6% 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 (%)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6	6

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

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 100% 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 (%)	99	99	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in December

Winds average 6 mph in December.

Across December, daily wind ranges from about 6 mph on the calmest days to 6 mph 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 (mph)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
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 (mph)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm
31	6	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 54 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 7:28 AM to 7:45 AM, and sunset from 5:29 PM to 5:38 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)	10.0	10.0	10.0	10.0	10.0	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9
Sunrise (AM)	7:28	7:29	7:30	7:31	7:31	7:32	7:33	7:34	7:34	7:35	7:36	7:36	7:37	7:38	7:38	7:39	7:40	7:40	7:41	7:41	7:42	7:42	7:43	7:43	7:44	7:44	7:44	7:45	7:45	7:45	7:45
Sunset (PM)	5:29	5:29	5:29	5:29	5:29	5:29	5:29	5:29	5:29	5:29	5:30	5:30	5:30	5:30	5:31	5:31	5:31	5:32	5:32	5:33	5:33	5:33	5:34	5:34	5:35	5:35	5:36	5:37	5:37	5:38	5:38

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.0	7:28	5:29
2	10.0	7:29	5:29
3	10.0	7:30	5:29
4	10.0	7:31	5:29
5	10.0	7:31	5:29
6	9.9	7:32	5:29
7	9.9	7:33	5:29
8	9.9	7:34	5:29
9	9.9	7:34	5:29
10	9.9	7:35	5:29
11	9.9	7:36	5:30
12	9.9	7:36	5:30
13	9.9	7:37	5:30
14	9.9	7:38	5:30
15	9.9	7:38	5:31
16	9.9	7:39	5:31
17	9.9	7:40	5:31
18	9.9	7:40	5:32
19	9.9	7:41	5:32
20	9.9	7:41	5:33
21	9.9	7:42	5:33
22	9.9	7:42	5:33
23	9.9	7:43	5:34
24	9.9	7:43	5:34
25	9.9	7:44	5:35
26	9.9	7:44	5:35
27	9.9	7:44	5:36
28	9.9	7:45	5:37
29	9.9	7:45	5:37
30	9.9	7:45	5:38
31	9.9	7:45	5:38

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.4 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 8.49 kWh/m² in June across the year — December's 3.4 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	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.4	3.5	3.5
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	3.5	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.4	Moderate
7	3.4	Moderate
8	3.4	Moderate
9	3.4	Moderate
10	3.4	Moderate
11	3.4	Moderate
12	3.4	Moderate
13	3.4	Moderate
14	3.3	Moderate
15	3.3	Moderate
16	3.3	Moderate
17	3.3	Moderate
18	3.3	Moderate
19	3.3	Moderate
20	3.3	Moderate
21	3.3	Moderate
22	3.4	Moderate
23	3.4	Moderate
24	3.4	Moderate
25	3.4	Moderate
26	3.4	Moderate
27	3.4	Moderate
28	3.4	Moderate
29	3.4	Moderate
30	3.5	Moderate
31	3.5	Moderate

Planning a trip in December

Is December a good time to visit Somerton?

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

8.2

Sightseeing

4th-best month of the year

4.8

Beach & pool

8th-best month of the year

December is one of the better times to visit Somerton for general sightseeing.

What to pack for Somerton in December

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

In December, Somerton sees daytime highs around 69°F and nights near 48°F. Little to plan around — just the basics.

UV index in Somerton in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Somerton peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 3 (moderate).

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)	4	5	5	8	8	11	11	10	9	6	4	3
Level	Moderate	Moderate	Moderate	Very high	Very high	Extreme	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	Moderate
Mar	5	Moderate
Apr	8	Very high
May	8	Very high
Jun	11	Extreme
Jul	11	Extreme
Aug	10	Very high
Sep	9	Very high
Oct	6	High
Nov	4	Moderate
Dec	3	Moderate

Location & terrain

Where is Somerton?

Somerton sits at 32.6°N, 114.7°W, 105 ft above sea level, in United States. The nearest listed city is San Luis, 8.7 mi away.

Topography around Somerton

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Somerton.

Within 2 miles, the terrain around Somerton has only modest variations in elevation — a maximum elevation change of 69 ft around an average of 105 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 771 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,655 ft.

The land around Somerton is covered by cropland (77%) within 2 miles, cropland (43%) and bare terrain (35%) within 10 miles, and bare terrain (72%) within 50 miles.

2 miles

69 ft

cropland 77%

10 miles

771 ft

cropland 43%

50 miles

3,655 ft

bare terrain 72%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

December weather nearby: San Luis 8.7 mi · Yuma 9.9 mi · San Luis Río Colorado 11 mi · Fortuna Foothills 18 mi · Ciudad Guadalupe Victoria 31 mi · Puebla 37 mi · Mexicali 43 mi · Calexico 46 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
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 Somerton (32.5964°, -114.7097°, elevation 105 ft), 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. 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 (°F)	Avg low (°F)
1	72	51
2	72	50
3	71	50
4	71	50
5	71	50
6	71	49
7	71	49
8	70	49
9	70	49
10	70	49
11	70	49
12	69	49
13	69	48
14	69	48
15	69	48
16	69	48
17	69	48
18	68	48
19	68	47
20	68	47
21	68	47
22	68	47
23	68	47
24	68	47
25	68	47
26	68	47
27	68	47
28	68	47
29	68	47
30	68	47
31	68	47

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	75	25
8	75	25
9	75	25
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	75	25
16	75	25
17	75	25
18	75	25
19	75	25
20	74	26
21	74	26
22	74	26
23	74	26
24	74	26
25	73	27
26	73	27
27	73	27
28	73	27
29	73	27
30	73	27
31	73	27

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	72	51
2	72	50
3	71	50
4	71	50
5	71	50
6	71	49
7	71	49
8	70	49
9	70	49
10	70	49
11	70	49
12	69	49
13	69	48
14	69	48
15	69	48
16	69	48
17	69	48
18	68	48
19	68	47
20	68	47
21	68	47
22	68	47
23	68	47
24	68	47
25	68	47
26	68	47
27	68	47
28	68	47
29	68	47
30	68	47
31	68	47

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	75	25
8	75	25
9	75	25
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	75	25
16	75	25
17	75	25
18	75	25
19	75	25
20	74	26
21	74	26
22	74	26
23	74	26
24	74	26
25	73	27
26	73	27
27	73	27
28	73	27
29	73	27
30	73	27
31	73	27

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	72	51
2	72	50
3	71	50
4	71	50
5	71	50
6	71	49
7	71	49
8	70	49
9	70	49
10	70	49
11	70	49
12	69	49
13	69	48
14	69	48
15	69	48
16	69	48
17	69	48
18	68	48
19	68	47
20	68	47
21	68	47
22	68	47
23	68	47
24	68	47
25	68	47
26	68	47
27	68	47
28	68	47
29	68	47
30	68	47
31	68	47

	Clearer (%)	Cloudier (%)
1	76	24
2	76	24
3	76	24
4	76	24
5	75	25
6	75	25
7	75	25
8	75	25
9	75	25
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	75	25
16	75	25
17	75	25
18	75	25
19	75	25
20	74	26
21	74	26
22	74	26
23	74	26
24	74	26
25	73	27
26	73	27
27	73	27
28	73	27
29	73	27
30	73	27
31	73	27

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0