Highland weather in December

In December, Highland sees average daytime highs of 57°F and overnight lows near 39°F, with 1.7 in of precipitation across 4.6 wet days and about 9.8 hours of daylight. It is the 12th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 59°F in the first days to 56°F by the end. The sky is clear or mostly clear about 52% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 48 min by month's end. Set against the rest of the year, December is Highland's 9th-clearest and 2nd-windiest month. For the whole year in context, see Highland's year-round climate.

Daytime high: 57°; 12th warmest
Overnight low: 39°; 1st coldest
Precipitation: 1.7 in; 4.6 wet days
Daylight: 9 h 42 min; 6:53 AM – 4:37 PM
Cloud cover: 42%; 9th clearest
Wind: 4 mph; 2nd windiest
Solar energy: 3.04 kWh/m²
Travel score: 4.7; out of 10

Highland is city in San Bernardino County, California, United States.

Density: 1,121/km²; people per km²
Founded: 1891

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

← November Highland 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 59°F in the first days to 56°F by the end.

A typical December day in Highland reaches about 57°F in the afternoon and slips back to 39°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 46°F and 67°F. Set against its neighbours, December runs about 8°F cooler than 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 (°F)	59	59	59	58	58	58	58	58	57	57	57	57	57	56	56	56	56	56	56	56	56	56	55	55	55	55	55	56	56	56	56
Avg low (°F)	41	41	41	41	40	40	40	40	40	40	40	39	39	39	39	39	39	38	38	38	38	38	38	38	38	38	38	38	38	38	38

	Avg high (°F)	Avg low (°F)
1	59	41
2	59	41
3	59	41
4	58	41
5	58	40
6	58	40
7	58	40
8	58	40
9	57	40
10	57	40
11	57	40
12	57	39
13	57	39
14	56	39
15	56	39
16	56	39
17	56	39
18	56	38
19	56	38
20	56	38
21	56	38
22	56	38
23	55	38
24	55	38
25	55	38
26	55	38
27	55	38
28	56	38
29	56	38
30	56	38
31	56	38

How December really feels in Highland

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.

Highland weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	57° / 40°	2.2	5.6	0.9	10	4.7
Feb	58° / 40°	2.7	6.6	1.1	10.7	4.8
Mar	62° / 43°	1.6	5.7	0.9	11.7	6.2
Apr	68° / 46°	0.8	3.3	0.3	12.8	7.7
May	75° / 52°	0.3	2.5	0	13.8	8.7
Jun	83° / 58°	0.1	0.7	0	14.2	7.8
Jul	89° / 65°	0.5	2.9	0	14	5.4
Aug	89° / 65°	0.4	3	0	13.3	5.3
Sep	85° / 61°	0.3	1.6	0	12.2	7.2
Oct	75° / 53°	0.5	2.1	0	11.1	8.8
Nov	64° / 45°	0.7	2.9	0.2	10.2	7.2
Dec	57° / 39°	1.7	4.6	0.5	9.8	4.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

	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 (%)	70	69	68	67	66	66	66	65	65	65	64	64	65	65	65	65	65	65	65	65	65	65	64	64	64	63	63	63	62	62	61
Cloudier (%)	30	31	32	33	34	34	34	35	35	35	36	36	35	35	35	35	35	35	35	35	35	35	36	36	36	37	37	37	38	38	39

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	68	32
4	67	33
5	66	34
6	66	34
7	66	34
8	65	35
9	65	35
10	65	35
11	64	36
12	64	36
13	65	35
14	65	35
15	65	35
16	65	35
17	65	35
18	65	35
19	65	35
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	63	37
27	63	37
28	63	37
29	62	38
30	62	38
31	61	39

Chance of precipitation in December

Any precipitationSnow

Highland gets around 1.7 in of rain and snow over 4.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 15% and peaks near 17% on the wettest days, and about 1 day brings snow.

	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 (%)	13	13	13	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	17	17	17
Snow chance (%)	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2

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

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 (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

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

Wind in December

Winds average 4 mph in December.

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

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 h 48 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 6:42 AM to 6:59 AM, and sunset from 4:35 PM to 4:45 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)	9.9	9.9	9.9	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.8
Sunrise (AM)	6:42	6:43	6:44	6:44	6:45	6:46	6:47	6:48	6:48	6:49	6:50	6:50	6:51	6:52	6:52	6:53	6:54	6:54	6:55	6:55	6:56	6:56	6:57	6:57	6:57	6:58	6:58	6:59	6:59	6:59	6:59
Sunset (PM)	4:35	4:35	4:35	4:35	4:35	4:35	4:35	4:35	4:35	4:36	4:36	4:36	4:36	4:36	4:37	4:37	4:37	4:38	4:38	4:39	4:39	4:39	4:40	4:40	4:41	4:42	4:42	4:43	4:43	4:44	4:45

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.9	6:42	4:35
2	9.9	6:43	4:35
3	9.9	6:44	4:35
4	9.8	6:44	4:35
5	9.8	6:45	4:35
6	9.8	6:46	4:35
7	9.8	6:47	4:35
8	9.8	6:48	4:35
9	9.8	6:48	4:35
10	9.8	6:49	4:36
11	9.8	6:50	4:36
12	9.8	6:50	4:36
13	9.8	6:51	4:36
14	9.7	6:52	4:36
15	9.7	6:52	4:37
16	9.7	6:53	4:37
17	9.7	6:54	4:37
18	9.7	6:54	4:38
19	9.7	6:55	4:38
20	9.7	6:55	4:39
21	9.7	6:56	4:39
22	9.7	6:56	4:39
23	9.7	6:57	4:40
24	9.7	6:57	4:40
25	9.7	6:57	4:41
26	9.7	6:58	4:42
27	9.7	6:58	4:42
28	9.7	6:59	4:43
29	9.7	6:59	4:43
30	9.7	6:59	4:44
31	9.8	6:59	4:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.04 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.04 kWh/m² to a high of 8.39 kWh/m² in June across the year — December's 3.04 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)	3.2	3.1	3.1	3.1	3.1	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.1	3.1	3.1
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	3.2	Moderate
2	3.1	Moderate
3	3.1	Moderate
4	3.1	Moderate
5	3.1	Moderate
6	3.0	Moderate
7	3.0	Moderate
8	3.0	Moderate
9	3.0	Moderate
10	3.0	Moderate
11	3.0	Moderate
12	3.0	Moderate
13	3.0	Moderate
14	3.0	Moderate
15	3.0	Moderate
16	3.0	Moderate
17	3.0	Moderate
18	3.0	Moderate
19	3.0	Moderate
20	3.0	Moderate
21	3.0	Moderate
22	3.0	Moderate
23	3.0	Moderate
24	3.0	Moderate
25	3.0	Moderate
26	3.0	Moderate
27	3.0	Moderate
28	3.0	Moderate
29	3.1	Moderate
30	3.1	Moderate
31	3.1	Moderate

Planning a trip in December

Is December a good time to visit Highland?

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

4.7

Sightseeing

11th-best month of the year

0.0

Beach & pool

10th-best month of the year

December is a reasonable time to visit Highland for sightseeing.

What to pack for Highland in December

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

In December, Highland sees daytime highs around 57°F and nights near 39°F. Worth packing: a warm layer. About 5 days see rain.

a warm layer

UV index in Highland in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Highland peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months 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	11	8	6	4	3
Level	Moderate	Moderate	High	Very high	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

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

Air quality in Highland 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 Highland is worst in September — around 30 µg/m³ PM2.5 (moderate), about 5.3× the cleanest month (December, 6 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)	6	7	9	9	9	16	12	15	30	7	6	6
Level	Good	Good	Good	Good	Good	Moderate	Good	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	6	Good
Feb	7	Good
Mar	9	Good
Apr	9	Good
May	9	Good
Jun	16	Moderate
Jul	12	Good
Aug	15	Moderate
Sep	30	Moderate
Oct	7	Good
Nov	6	Good
Dec	6	Good

Location & terrain

Where is Highland?

Highland sits at 34.1°N, 117.2°W, 1,309 ft above sea level, in United States. The nearest listed city is San Bernardino, 5.0 mi away.

Topography around Highland

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

Within 2 miles, the terrain around Highland has significant variations in elevation — a maximum elevation change of 1,558 ft around an average of 1,394 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,699 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,411 ft.

The land around Highland is covered by artificial surfaces (57%) within 2 miles, trees (28%), artificial surfaces (28%) and shrubs (24%) within 10 miles, and shrubs (29%) and bare terrain (21%) within 50 miles.

2 miles

1,558 ft

artificial surfaces 57%

10 miles

6,699 ft

trees 28%

50 miles

11,411 ft

shrubs 29%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

December weather nearby: San Bernardino 5.0 mi · Redlands 5.0 mi · Loma Linda 6.2 mi · Colton 6.8 mi · Rialto 9.3 mi · Bloomington 11 mi · Yucaipa 12 mi · Fontana 13 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 Highland (34.1283°, -117.2087°, elevation 1,309 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. 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 (°F)	Avg low (°F)
1	59	41
2	59	41
3	59	41
4	58	41
5	58	40
6	58	40
7	58	40
8	58	40
9	57	40
10	57	40
11	57	40
12	57	39
13	57	39
14	56	39
15	56	39
16	56	39
17	56	39
18	56	38
19	56	38
20	56	38
21	56	38
22	56	38
23	55	38
24	55	38
25	55	38
26	55	38
27	55	38
28	56	38
29	56	38
30	56	38
31	56	38

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	68	32
4	67	33
5	66	34
6	66	34
7	66	34
8	65	35
9	65	35
10	65	35
11	64	36
12	64	36
13	65	35
14	65	35
15	65	35
16	65	35
17	65	35
18	65	35
19	65	35
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	63	37
27	63	37
28	63	37
29	62	38
30	62	38
31	61	39

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

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

	Avg high (°F)	Avg low (°F)
1	59	41
2	59	41
3	59	41
4	58	41
5	58	40
6	58	40
7	58	40
8	58	40
9	57	40
10	57	40
11	57	40
12	57	39
13	57	39
14	56	39
15	56	39
16	56	39
17	56	39
18	56	38
19	56	38
20	56	38
21	56	38
22	56	38
23	55	38
24	55	38
25	55	38
26	55	38
27	55	38
28	56	38
29	56	38
30	56	38
31	56	38

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	68	32
4	67	33
5	66	34
6	66	34
7	66	34
8	65	35
9	65	35
10	65	35
11	64	36
12	64	36
13	65	35
14	65	35
15	65	35
16	65	35
17	65	35
18	65	35
19	65	35
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	63	37
27	63	37
28	63	37
29	62	38
30	62	38
31	61	39

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

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

	Avg high (°F)	Avg low (°F)
1	59	41
2	59	41
3	59	41
4	58	41
5	58	40
6	58	40
7	58	40
8	58	40
9	57	40
10	57	40
11	57	40
12	57	39
13	57	39
14	56	39
15	56	39
16	56	39
17	56	39
18	56	38
19	56	38
20	56	38
21	56	38
22	56	38
23	55	38
24	55	38
25	55	38
26	55	38
27	55	38
28	56	38
29	56	38
30	56	38
31	56	38

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	68	32
4	67	33
5	66	34
6	66	34
7	66	34
8	65	35
9	65	35
10	65	35
11	64	36
12	64	36
13	65	35
14	65	35
15	65	35
16	65	35
17	65	35
18	65	35
19	65	35
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	63	37
27	63	37
28	63	37
29	62	38
30	62	38
31	61	39

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

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